Chiral magnetic nanocoil and synthetic methods thereof

Abstract

The present invention relates to a technology that can be used to synthesize chiral magnetic nanocoils using an electroplating method and to fabricate a magnetic nanosensor capable of generating an electric field by strongly responding to an external magnetic field, such as Faraday's law of electromagnetic induction, at the nanoscale based on the coil shape of the material. A method for synthesizing chiral magnetic nanocoils according to one embodiment may include the steps of: generating primary particles composed of metal ions by applying an external electric field; bonding chiral molecules to the surface of the generated primary particles; and controlling the assembly direction of the next primary particles by means of the bonded chiral molecules.

Description

Technology Field

[0001] The present invention relates to a technology that can be used to synthesize chiral magnetic nanocoils using an electroplating method and to fabricate magnetic nanosensors capable of generating an electric field by strongly responding to an external magnetic field, such as Faraday's law of electromagnetic induction, at the nanoscale based on the coil shape of the material. Background Technology

[0002] Chirality refers to the property of a material having a mirror-image symmetric structure that cannot be superimposed by rotation or translation.

[0003] Incorporating these properties into nanomaterials enables the manifestation of new physical, chemical, and optical characteristics, making applications possible in various fields such as catalysts, sensors, biochemistry, and spintronics.

[0004] In particular, chiral metal nanomaterials with magnetic properties have high utility value in that they respond to external magnetic fields.

[0005] However, the technology to impart chirality to magnetic metal inorganic nanomaterials has currently faced limitations in terms of manufacturing complexity, stability, and efficiency.

[0006] Therefore, a material synthesis method capable of solving such problems is required, and furthermore, a technology is needed to verify whether the material can actually exhibit a chiral magnetic effect under an external magnetic field at the nanoscale.

[0007] Conventionally, the application of existing chiral nanomaterials to various materials has been recognized as a very difficult problem. In particular, the synthesis methods for chiral nanomaterials based on 3d transition metal materials with magnetic properties are even more limited. Prior art literature

[0008] Korean Registered Patent No. 10-1916588 "Metal nanospring and method for manufacturing the same" Korean Registered Patent No. 10-1711888 "Metal nanotube and method for manufacturing the same" Korean Registered Patent No. 10-1967213 "Method for manufacturing a porous membrane having magnetic properties" The problem to be solved

[0009] The present invention aims to provide a chiral magnetic nanocoil. means of solving the problem

[0010] A method for synthesizing a chiral magnetic nanocoil according to one embodiment may include the steps of: generating primary particles composed of metal ions by applying an external electric field; bonding chiral molecules to the surface of the generated primary particles; and controlling the assembly direction of the next primary particles by means of the bonded chiral molecules.

[0011] A method for synthesizing a chiral magnetic nanocoil according to one embodiment may further include a step of controlling the influence of the chiral molecule by controlling at least one of the strength of the external electric field, the concentration of the metal ion precursor and additive, or the concentration of the chiral molecule.

[0012] The step of bonding a chiral molecule to the surface of the generated primary particle according to one embodiment comprises, as the chiral molecule, cinchonine (C 19 H 22 It may include a step of incorporating N2O·1 / 2H2SO4 (hereinafter referred to as sinconin) as a chiral derivative of the first direction.

[0013] The step of binding the above-mentioned cynconin according to one embodiment as a first-direction chiral derivative comprises C at a concentration within a selected range. 19 H 22 It may include a step of incorporating N2O·1 / 2H2SO4 as a first-direction chiral derivative.

[0014] The step of bonding a chiral molecule to the surface of the generated primary particle according to one embodiment comprises, as the chiral molecule, cinchonidine (C 19 H 22 It may include a step of incorporating N2O (hereinafter referred to as sinconidine) as a second-direction chiral derivative.

[0015] The step of binding the above-mentioned cinconidine according to one embodiment as a second-direction chiral derivative comprises C at a concentration within a selected range. 19 H 22 It may include a step of incorporating N2O as a second-direction chiral derivative.

[0016] A method for synthesizing a chiral magnetic nanocoil according to one embodiment allows the concentration of the chiral derivative in the first direction or the second direction to be designed in the range of [helical modifier] : [chiral modifier] = 60~80 mM : 5~50 μM (1200~16000 : 1) based on an AAO template having a nanopore size of 200 nm in diameter and 60 μm in height, when the concentration of metal ions is 50~200 mM.

[0017] The step of bonding chiral molecules to the surface of the generated primary particles according to one embodiment may include adding a chiral derivative of the first direction or a chiral derivative of the second direction to a solution containing a metal precursor and at least one additive, then adding a small amount of acid to adjust the pH of the solution to 1.0 to 3.0, and filling the nanopore mold to electrodeposit. Effects of the invention

[0018] According to one embodiment, a chiral magnetic nanocoil can be provided. Brief explanation of the drawing

[0019] FIG. 1 is a diagram illustrating a method for manufacturing a chiral magnetic nanocoil according to one embodiment. FIGS. 2a to 2c are examples showing that magnetic nanocoils, which have first-direction and second-direction chirality respectively obtained by adding synconin and synconidine, undergo electromagnetic induction by having opposite potentials under changes in an external magnetic field. Figures 2d to 2g illustrate scanning electron microscope images of nanocoils when each chiral molecule is added. Figures 2e and 2h are drawings illustrating 3-axis color maps showing chiral bias under each condition with adjusted current density and additive concentration ratio. Figures 2f and 2i illustrate the results of the first derivative of the inverse function of a linear sweep amperometry (LSA) graph. FIGS. 3a to 3f include transmission electron microscope images of chiral magnetic nanocoils, X-ray diffraction analysis spectra, high-resolution transmission electron microscope and scanning transmission electron microscope images of primary particles, electron diffraction patterns, and graphs showing that the size of primary particles decreases with the addition of chiral molecules. Figure 4 shows the results of Fourier transform infrared (FTIR) spectroscopy, near edge X-ray absorption fine structure (NEXAFS) spectroscopy, and X-ray photoelectron spectroscopy (XPS). Figure 5 is a diagram showing scanning electron microscope images, high-resolution transmission electron microscope images and heat maps, heat map color ratios and ion reduction resistance graphs, and potential difference graphs under changes in an external magnetic field, as a result of the excessive addition of the aforementioned synconin and synconidin. Figure 6 is a diagram showing the mechanism of chiral nanocoil formation when synconin / synconidine is added to a material. Figure 7 is a diagram showing that nanocoils having first and second direction chirality exhibit electromotive force signals in opposite directions under various experimental conditions. Specific details for implementing the invention

[0020] Specific structural or functional descriptions of embodiments according to the concept of the present invention disclosed herein are provided merely for the purpose of explaining embodiments according to the concept of the present invention, and embodiments according to the concept of the present invention may be implemented in various forms and are not limited to the embodiments described herein.

[0021] Embodiments according to the concept of the present invention may be subject to various modifications and may take various forms; therefore, embodiments are illustrated in the drawings and described in detail in this specification. However, this is not intended to limit the embodiments according to the concept of the present invention to specific disclosed forms, and includes modifications, equivalents, or substitutions that fall within the spirit and scope of the present invention.

[0022] Terms such as "first" or "second" may be used to describe various components, but said components should not be limited by said terms. For the sole purpose of distinguishing one component from another, for example, without departing from the scope of rights according to the concept of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component.

[0023] When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. Conversely, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between. Expressions describing the relationships between components, such as "between," "exactly between," or "directly adjacent to," should be interpreted in the same way.

[0024] The terms used herein are used merely to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as “comprising” or “having” are intended to specify the existence of the described features, numbers, steps, actions, components, parts, or combinations thereof, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0025] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this specification.

[0027] Hereinafter, embodiments will be described in detail with reference to the attached drawings. However, the scope of the patent application is not limited or restricted by these embodiments. Identical reference numerals in each drawing indicate identical components.

[0028] FIG. 1 is a diagram illustrating a method for manufacturing a chiral magnetic nanocoil according to one embodiment.

[0029] The present invention provides a method for mass-producing chiral magnetic nanocoils applicable to various materials by utilizing an electrodeposition method that offers high synthesis convenience and stability, is economical and eco-friendly, and is advantageous for large-scale synthesis.

[0030] To this end, a method for manufacturing a chiral magnetic nanocoil according to one embodiment can generate primary particles composed of metal ions by applying an external electric field (step 101).

[0031] According to recent prior research, diversification of material shapes, such as nanotubes and nanocoils, has become possible even within nanopore frames by controlling the additives and the current density applied during synthesis, and these materials can be manufactured through a mechanism in which primary particles aggregate.

[0032] In a metal precursor solution containing metal ions, there is no limitation on which metal ions are used, but considering electrical, magnetic, and thermal conductivity, it is more preferable to use ions derived from transition metal oxides containing transition metals such as nickel (Ni), cobalt (Co), iron (Fe), and chromium (Cr). In the metal precursor solution, the metal ions may be derived from transition metals, noble metals, and rare earth metals. Transition metals may be Fe, Co, or Ni. Noble metals may be gold (Au), platinum (Pt), palladium (Pd), or silver (Ag). Rare earth metals may be neodymium (Nd), samarium (Sm), or gadolinium (Gd), and may be various alloy materials made of two or more of these metals.

[0033] Meanwhile, not only 3d transition metals, which are representative magnetic materials, but also various metal precursors are highly soluble in water, making them very advantageous for use in the manufacture of nanomaterials based on electroplating methods.

[0034] Next, the method for manufacturing a chiral magnetic nanocoil according to one embodiment can bond chiral molecules to the surface of the generated primary particles (step 102).

[0035] In the present invention, the process of forming a chiral nanocoil shape can proceed in a manner different from a general plating method, in which primary particles composed of metal ions are first generated when an external electric field is applied, and chiral molecules bind to the metal surface, thereby controlling the assembly direction of the next primary particles or the directionality of other shaped molecules.

[0036] At this time, since the bonding affinity between chiral molecules and metal ions, metal surfaces, coil-forming molecules, etc., varies, selecting appropriate chiral molecules can serve as a key strategy for the synthesis of chiral magnetic nanocoils.

[0037] In addition, the influence of chiral molecules during the assembly process between primary particles can be controlled by the strength of the external electric field, the concentration of metal ion precursors and additives, or the concentration of chiral molecules.

[0038] For the influence of chiral molecules, the method for manufacturing a chiral magnetic nanocoil according to one embodiment can control the influence of chiral molecules by controlling at least one of the strength of an external electric field, the concentration of a metal ion precursor and an additive, or the concentration of chiral molecules.

[0039] In addition, the method for manufacturing a chiral magnetic nanocoil according to one embodiment may bind a chiral molecule to the surface of a generated primary particle, and may bind a chiral derivative of the first direction as a chiral molecule.

[0040] For example, a method for manufacturing a chiral magnetic nanocoil according to one embodiment, in order to combine cynconine as a chiral derivative of the first direction, C 19 H 22 N2O·1 / 2H2SO4, 0.01 mM can be combined as a first-direction chiral derivative.

[0041] Meanwhile, in order to bind a chiral magnetic nanocoil according to one embodiment, in order to bind a chiral molecule to the surface of the generated primary particle, cynconidine can be bound as a chiral derivative of the second direction as a chiral molecule. In particular, in order to bind cynconidine as a chiral derivative of the second direction, C 19 H 22 N2O, 0.01 mM can be combined as a second-direction chiral derivative.

[0042] In addition to sinconin and sinconidin, various modifiers can be used as chiral molecules. For example, modifiers such as quinine / quinidine and L- / D-histidine can be used.

[0043] For example, the concentration of the chiral derivative can be designed by considering the volume ratio of the AAO (Anodic Aluminum Oxide) template and the concentration of metal ions.

[0044] Based on an AAO template with a single nanopore size of 200 nm in diameter and 60 μm in height currently in use, when the concentration of metal ions is 50 to 200 mM, chiral magnetic nanocoils can be designed in the range of [helical modifier] : [chiral modifier] = 60 to 80 mM : 5 to 50 μM (1200 to 16000 : 1).

[0045] In particular, even if the diameter and height of the AAO template vary, chiral magnetic nanocoils can be synthesized by controlling the concentrations of metal ions, additives (coil-forming molecules), and chiral molecules together according to the volume ratio of the corresponding cylinder.

[0046] That is, chiral nanocoils can be synthesized even without a template with a diameter of 200 nm and a height of 60 μm, by appropriately adjusting the ratio corresponding to [helical modifier] : [chiral modifier].

[0047] For example, if the height of the template is reduced from 60 to 30 μm, the ratio of the precursor solution filling the pores is reduced by half as the volume of the pore template decreases. Therefore, chiral magnetic nanocoils can be synthesized by reducing the concentrations of metal ions, additives (coil-forming molecules), and chiral molecules to about half of the concentration range described above.

[0048] Meanwhile, when the AAO template has a diameter of 200 nm and a height of 60 μm (typical AAO specifications used for nanocoil synthesis), the standard condition for nanocoil synthesis is [Co, Fe, VO 2+When [ , LAA] = 80, 80, 60, 60 mM, and the AAO template diameter is 200 nm and height is 15 μm (when the area of ​​the AAO pore wall becomes 1 / 4), [Co, Fe, VO 2+ Nanocoils can be synthesized under conditions of , LAA] = 20, 20, 15, 15 mM.

[0049] In addition, as described above, by adjusting the concentrations of the required precursors and additives according to the area ratio of the walls of the AAO template through which current can flow during electrodeposition, magnetic nanocoils can be synthesized by calculating the concentration ratio per area, even if the specifications of the AAO change.

[0050] Therefore, when the specifications of a single AAO pore frame are within the range of diameter 70–300 nm and height 10–100 μm, chiral magnetic nanocoils can be synthesized by adjusting the concentrations of metal ions and additives in the precursor solution in proportion.

[0051] A method for manufacturing a chiral magnetic nanocoil according to one embodiment can be performed by adding a first-direction chiral derivative or a second-direction chiral derivative to a solution containing a metal precursor and at least one additive in order to bond chiral molecules to the surface of the generated primary particles, then adding a small amount of acid to adjust the pH of the solution to 1.0 to 3.0, and filling the nanoporous mold to electrodeposit.

[0052] Based on the above, the present invention is not only the first example of the synthesis of chiral nanomaterials using an electroplating method, but is also expected to have great value as a major method for the mass synthesis of chiral magnetic nanomaterials.

[0053] In addition, the method for manufacturing a chiral magnetic nanocoil according to one embodiment can control the assembly direction of the next primary particle by means of a combined chiral molecule (step 103).

[0054] FIGS. 2a to 2i show examples for the synthesis of chiral magnetic nanocoils.

[0055] In particular, FIGS. 2a to 2c are examples showing that magnetic nanocoils, which have first-direction and second-direction chirality respectively obtained by adding synconin and synconidine, undergo electromagnetic induction while having opposite potentials under changes in an external magnetic field.

[0056] Figures 2d to 2g illustrate scanning electron microscope images of nanocoils when each chiral molecule is added.

[0057] Figures 2e and 2h are drawings illustrating 3-axis color maps showing chiral bias under each condition with adjusted current density and additive concentration ratio.

[0058] Figures 2f and 2i illustrate the results of the first derivative of the inverse function of a linear sweep amperometry (LSA) graph.

[0059] Chiral magnetic nanocoils can be synthesized by electroplating using anodized aluminum nanoporous templates.

[0060] Each pore is cylindrical in shape with a diameter of 200 nm and a height of 60 μm, and is arranged in a uniform hexagonal matrix.

[0061] To synthesize the material by electrochemical method, a 300 nm thick silver (Ag) acting as the cathode is coated on one side of the nanoporous frame using an electron beam evaporator, and a platinum (Pt) plate is used as the anode material.

[0062] Cobalt(II) sulfate heptahydrate (Co(SO4)2·7H2O, 80 mM) and iron(II) sulfate heptahydrate (Fe(SO4)2·7H2O, 80 mM) are used as metal precursors, vanadium(IV) oxide sulfate hydrate (VOSO4·xH2O, 60 mM) and L-ascorbic acid (C6H8O6, 80 mM) are used as additives, and cynconin hemisulfate salt (C 19 H 22 N2O·1 / 2H2SO4, 0.01 mM), sinconidine (C 19 H 22 N2O (0.01 mM) is used as a chiral derivative in the first direction and second direction, respectively.

[0063] After mixing the above materials, a small amount of acid is added to adjust the pH of the solution to 1.0 to 3.0, and then the mixture can be filled into a nanoporous frame and electrodeposited.

[0064] After the material is synthesized, the cathode is removed with an iodine (I)-based silver etching solution, the nanoporous frame is dissolved with sodium hydroxide (NaOH), and the nanocoil, which has been washed several times, is dispersed in ethanol (C2H6O).

[0065] FIGS. 2a to 2c show magnetic nanocoils that have acquired first-direction and second-direction chirality by adding synconin and synconidine, respectively, and are electromagnetically induced with opposite potentials under changes in an external magnetic field, and FIGS. 2d and 2g show scanning electron microscope images of nanocoils when each chiral molecule is added.

[0066] Additionally, Figures 2e and 2h show a 3-axis color map illustrating chiral bias under each condition with adjusted current density and additive concentration ratio, and Figures 2f and 2i include the result of the first derivative of the inverse function of the linear sweep amperometry (LSA) graph.

[0067] The first peak of the LSA first derivative data indicates whether a surface conduction mode occurs, and if the peak does not appear, synthesis into a coil shape is impossible.

[0068] Meanwhile, the second peak occurring at a current density of 50 mA or higher serves as an indicator confirming the possibility of synthesis in the same crystal direction when assembly between primary particles occurs, and unlike in the control sample, this peak disappears completely upon the addition of cinconin / cinconidin.

[0069] These chiral-shaped molecules (0.01 mM) exist in solution at a level of about 1 / 10,000 relative to coil-shaped molecules (80 mM), which means that even a very small amount of synconin / synconidin can randomly orient the assembly direction of primary particles.

[0070] In other words, through the disappearance of the second peak of the LSA first derivative graph, it can be inferred that chiral molecules play a specific role in controlling the assembly direction on the surface of the primary particles.

[0071] FIGS. 3a to 3f are drawings of an example analyzing the microstructure of a chiral magnetic nanocoil.

[0072] In particular, FIGS. 3a to 3f include transmission electron microscope images of chiral magnetic nanocoils, X-ray diffraction analysis spectra, high-resolution transmission electron microscope and scanning transmission electron microscope images of primary particles, electron diffraction patterns, and graphs showing that the size of primary particles decreases as chiral molecules are added.

[0073] In the case of a transmission electron microscope, since 2D projection results are measured, it is difficult to perceive the rotation direction of the nanocoil, so this 30 o You can check the chiral direction of the coil by tilting it up.

[0074] This shows that, as seen in the scanning electron microscope image, it rotates in the first direction when synconin is added and in the second direction when synconidin is added.

[0075] When the X-ray diffraction pattern of the above sample is obtained, the presence of a cobalt iron hydroxide phase can be observed. This indicates that hydroxyl groups generated by the reduction of nitrate ions present in the liquid are having an influence in a situation where metal ions are not reduced relatively, and this can also be seen as indirect evidence that cinchonidin / cinchonidin is hindering the additional reduction of metal ions on the surface of the primary particles.

[0076] This can actually be confirmed by the fact that the size of the primary particles decreases across the entire applied current range in high-resolution transmission electron microscope images.

[0077] Figure 4 shows the results of Fourier transform infrared (FTIR) spectroscopy, near edge X-ray absorption fine structure (NEXAFS) spectroscopy, and X-ray photoelectron spectroscopy (XPS).

[0078] As shown in Figure 4, among the chemicals used in the manufacturing process of chiral magnetic nanocoils, the only molecules containing nitrogen (N) are sinconin and sinconidine, which are used as chiral derivatives. By detecting these in the material using various analytical methods, it can be confirmed that chiral molecules actually act during nanocoil synthesis and are adsorbed on the surface of the material.

[0079] First, for FTIR analysis, nanowires without even coil-shaping molecules, nanocoils with only coil-shaping molecules, and chiral nanocoils with chiral-shaping molecules were measured, respectively. A notable finding was that as chiral-shaping molecules were added, the peaks caused by the coil-shaping molecules decreased significantly, and rapid fluctuations and instability among the other peaks were confirmed.

[0080] This implies that even synconin / synconidine at a level of about 1 / 10000 is preferentially adsorbed onto the surface of primary particles over coil-shaped molecules to the extent that it has a significant impact on the microstructure.

[0081] For XPS analysis, the C 1s and N 1s regions of nanomaterials containing wires, coils, chiral coils, and excessively chiral shaped molecules were measured. Coiled shaped molecules are characterized by the presence of C=C bonds, while C=O bonds, which are absent in chiral shaped molecules, are clearly present.

[0082] The two bonds mentioned above are not found in nanowires, but peaks caused by these bonds begin to appear in coil shapes.

[0083] Here, it can be observed that when additional chiral-forming molecules are added, the ratio of C=O bonds, which is the difference from coil-forming molecules, decreases.

[0084] This indicates that chiral shaping molecules are acting within the material during the formation of chiral nanocoils.

[0085] Furthermore, based on the observation that only chiralizing molecules possess N in all synthetic reactions, cinchonin / sinchonidin contribute to the imparting of chirality to nanocoils through the observation of N in NEXAFS and XPS analyses.

[0086] First, we succeeded in observing the presence of a small amount of N through NEXAFS analysis, and XPS analysis also confirmed that an N peak was generated starting from the addition of cinconin.

[0087] In this case, N 1s is quinuclidine (NC sp) of sinconin. 3 It can be decomposed into two peaks due to the bond) or the quinoline ring (-N=).

[0088] Compared to the control sample, it was confirmed that as cinconin was adsorbed onto the metal material, the peak caused by quinoline shifted toward the side with higher binding energy.

[0089] This is a result of the electron cloud becoming thinner from the perspective of nitrogen as the electrons of quinoline nitrogen form coordinate bonds with metal ions.

[0090] Figure 6 is a diagram showing the mechanism of chiral nanocoil formation when synconin / synconidine is added to a material.

[0091] Synthesizing the results corresponding to Figure 4, the mechanism by which chiral nanocoils are formed when synconin / synconidine is added to the material as shown in Figure 6 is as follows.

[0092] First, when the essential conditions for surface conduction to occur are met, vanadyl ascorbate, a coil-shaped molecule, plays a role in generating primary particles while appropriately hindering the reduction of metal ions.

[0093] Subsequently, the metal surface preferentially forms coordinate bonds with the nitrogen of the quinoline present within the chiralized molecule. The chiralized molecule has a large molecular structure extending to the left and right of the chiral center, which creates conditions that allow for bonding via weak van der Waals forces with the long methyl group on one side of vanadyl ascorbate.

[0094] In this way, the orientation of coil-shaped molecules can be induced, and as these induced coil-shaped molecules help establish the assembly direction of the next primary particle, the nanocoil consequently acquires chirality.

[0095] Figure 5 shows the chiral-forming molecular concentration effect and the shape change of the material observed by scanning electron microscopy when synconin / synconidine was added in excess of the optimal concentration (0.01 mM) for manufacturing chiral magnetic nanocoils.

[0096] The electrical resistance during reduction increased tenfold from the point where the chiral-forming molecule concentration exceeded 2 mM. Since the electrical resistance within the electrolyte is related to the redox reaction rates of ions, including metal ions dissolved on the electrode surface, this change suggests that a different mechanism may be at work during the metal ion reduction process. As if to support this, it was observed that all material syntheses failed from this point onward.

[0097] In addition, high-resolution transmission electron microscopy was observed to widen the spacing between primary particles forming the nanocoil as an excess amount of chiral molecules were added.

[0098] Looking at the heat map analysis, it can be thought that the excess synconin is excessively attached to the surface of the primary particle compared to the chiral nanocoil, and that such empty spaces were measured.

[0099] In other words, an excessive amount of synconine on the surface of the primary particle hinders the reduction of subsequent metal ions, and this can be understood in the same context as the sharp increase in electrical resistance during the aforementioned reduction.

[0100] In addition, for nanomaterials with 0, 0.01, 0.1, and 0.2 mM chiral molecules added during synthesis, a potential difference can be observed under changes in an external magnetic field.

[0101] In the case where no chiral molecules are added, a very low level of electromotive force can be generated compared to the chiral nanocoil (0.01 mM) shown in Fig. 2. This is because the directionality of the material is not fixed, so the electromotive forces may cancel each other out. On the other hand, too much of the molecules may cause the electromotive force to decrease as they begin to break down the shape of the material.

[0102] Figure 5 is a diagram showing scanning electron microscope images, high-resolution transmission electron microscope images and heat maps, heat map color ratios and ion reduction resistance graphs, and potential difference graphs under changes in an external magnetic field, as a result of the excessive addition of the aforementioned synconin and synconidin.

[0103] That is, Fig. 7 shows an example corresponding to the generation of electromotive force within a rotating magnetic field.

[0104] Faraday's law of electromagnetic induction explains the phenomenon in which a coil generates an electromotive force (emf) in response to an external magnetic flux that changes over time.

[0105] In Fig. 7, Faraday's law of electromagnetic induction can be observed at the nanoscale depending on the geometric eigenvalue of the chiral magnetic nanocoil.

[0106] vulcan carbon with good electrical conductivity can be mixed with isopropyl alcohol (IPA) and then aligned on a rotating ring disk electrode (RRDE) along with nanocoils having the same chirality.

[0107] Figure 7 is a diagram showing that nanocoils having first and second direction chirality exhibit electromotive force signals in opposite directions under various experimental conditions.

[0108] As can be seen in Fig. 7, nanocoils having first and second direction chirality can exhibit electromotive force signals in opposite directions.

[0109] By quantifying emf signals obtained differently depending on the concentration of nanocoils, the revolutions per minute (rpm) of the rotating ring-disk electrode, and the strength of the applied external magnetic field, it was confirmed that chiral magnetic nanocoils are actually undergoing electromagnetic induction in response to changes in the external magnetic field at the nanoscale. This result is direct evidence that chiral nanocoils can perform their role in response to the stimulus of an external magnetic field, and it can be said that there is a very high potential for future application in spintronics devices.

[0110] Ultimately, by utilizing the present invention, it is possible to mass-produce chiral magnetic nanocoils applicable to various materials using an electrodeposition method that is economical, eco-friendly, and advantageous for large-scale synthesis, while offering high synthesis convenience and stability.

[0111] In the case of including metal nanocoils such as chiral magnetic nanocoils, an external magnetic field is used to align them in one direction, then they are mixed with conductive materials to form an ink, and subsequently, a changing magnetic field is applied to the ink to measure the microelectromotive force.

[0112] In addition, coil-shaped metal nanocoils can be utilized to generate microelectromotive force.

[0113] Although the embodiments have been described above with reference to the limited drawings, those skilled in the art can make various modifications and variations from the description above. For example, suitable results can be achieved even if the described techniques are performed in a different order than described, and / or the components of the described system, structure, device, circuit, etc. are combined or assembled in a form different from described, or replaced or substituted by other components or equivalents.

[0114] Therefore, other implementations, other embodiments, and equivalents to the claims also fall within the scope of the claims set forth below.

Claims

Claim 1 A chiral magnetic nanocoil synthesized using an electroplating method, comprising: primary particles generated from metal ions by applying an external electric field; and chiral molecules bonded to the surface of the generated primary particles, wherein the bonded chiral molecules have a chiral derivative in a first direction or a chiral derivative in a second direction opposite to the first direction, and are bonded to the surface of the generated primary particles by bonding sinconin as the chiral derivative in the first direction or by bonding sinconidine as the chiral derivative in the second direction. Claim 2 A chiral magnetic nanocoil according to claim 1, characterized in that the influence of the chiral molecule is controlled by adjusting at least one of the strength of the external electric field, the concentration of the metal ion precursor and additive, or the concentration of the chiral molecule. Claim 3 delete Claim 4 In paragraph 1, C at a concentration within the selected range 19 H 22 A chiral magnetic nanocoil characterized by combining N2O·1 / 2H2SO4 as a first-direction chiral derivative and combining the said cinconin as a first-direction chiral derivative. Claim 5 delete Claim 6 In paragraph 4, C at a concentration within the selected range 19 H 22 A chiral magnetic nanocoil characterized by combining N2O as a second-direction chiral derivative and combining the cinconidine as a second-direction chiral derivative. Claim 7 A chiral magnetic nanocoil according to claim 6, characterized in that the concentration of the chiral derivative is designed by considering the volume ratio of the AAO (Anodic Aluminum Oxide) template and the concentration of metal ions. Claim 8 A chiral magnetic nanocoil according to claim 7, characterized in that when the AAO template is within the range of diameter 70 to 300 nm and height 10 to 100 μm, the concentrations of metal ions and chiral derivatives in the precursor solution are controlled according to a selected ratio. Claim 9 A chiral magnetic nanocoil according to claim 7, characterized in that, based on an AAO template having a nanopore size of 200 nm in diameter and 60 μm in height, when the concentration of metal ions is 50 to 200 mM, the concentration of the chiral derivative in the first direction or the second direction is designed in the range of [helical modifier] : [chiral modifier] = 60 to 80 mM : 5 to 50 μM (1200 to 16000 : 1). Claim 10 A chiral magnetic nanocoil according to claim 1, characterized in that a chiral derivative of the first direction or a chiral derivative of the second direction is added to a solution containing a metal precursor and at least one additive, a small amount of acid is added to adjust the pH of the solution to 1.0 to 3.0, and the solution is filled into a nanoporous frame and electrodeposited to bind chiral molecules to the surface of the generated primary particles. Claim 11 delete Claim 12 A nano component comprising a chiral magnetic nanocoil according to claim 1.

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