36 results about "Nanodot" patented technology

The invention provides a preparation method of a plate-shaped glassy carbon electrode, which comprises the following steps: curing a resin raw material into a plate-shaped resin block, carbonizing in an inert atmosphere, and respectively introducing a nitrogen source and a boron source for doping operation to obtain a co-doped plate-shaped resin block precursor; placing the co-doped plate-shaped resin block between two porous graphite plates, and carrying out high-temperature treatment to obtain a glassy carbon matrix; and immersing the glassy carbon substrate into the adhesion layer solution to form an adhesion layer, transferring the adhesion layer into a deposition solution which comprises a bismuth-containing solution and a gold-containing solution, forming bismuth-gold nano-dots on the adhesion layer, and washing and drying the bismuth-gold nano-dots to obtain the plate-shaped glassy carbon electrode. Through directional arrangement of crystal orientations, the tantalum carbide coating achieves higher electrical conductivity and thermal conductivity. And the sensitivity and the service life of the plate-shaped glassy carbon electrode are obviously improved and prolonged.

The application belongs to the field of electrode materials, and particularly relates to a raw-state ultra-thin carbon-coated metal sulfide nanodot material, which comprises metal sulfide nanodots and a nanoscale-thickness carbon layer uniformly coated on the surface of the metal sulfide nanodots. The application also provides a preparation method and application of the material. Different from conventional metal sulfide@carbon materials, the nanomaterial disclosed by the application is formed synchronously with metal sulfide and carbon materials, and the metal sulfide particles are smaller (nanodots), and the surface is uniformly coated with ultra-thin carbon material reaching atomic level nanoscale. Research finds that the material has better stability and better electrochemical performance in alkali metal secondary batteries.

The invention discloses a surface nano oxide dispersion strengthening method for high-strength and high-toughness aluminum alloy powder and a powder material thereof, and relates to the technical field of powder metallurgy materials. Aluminum-zinc-magnesium-copper-zirconium pre-alloyed atomized powder is used as a matrix, and is dispersed by virtue of polyvinylpyrrolidone and anhydrous alcohol; the preparation method comprises the following steps: sequentially introducing magnesium aluminate spinel nanoparticles, optional magnesium oxide nanoparticles and passivated magnesium nanoparticles for dry coating, embedding a nano dot matrix into a surface layer through ceramic ball micro shot blasting, removing organic matters in a vacuum subsection manner, thermally activating at 405-435 DEG C, cooling, and adding zinc micro powder for low-energy coating. The method is suitable for canning degassing, hot isostatic pressing and hot extrusion workpieces. And large-scale production can be realized. The oxide in the obtained powder is converted into intragranular non-communicated dispersion particles from a prior powder boundary communicated interlayer, the boundary connectivity is reduced, the densification combination is improved, the fracture toughness, impact and high-cycle fatigue are remarkably improved, meanwhile, the powder fluidity is kept, and the consistency is improved.

The invention provides a listeria monocytogenes detection kit based on iron-tannic acid network coating aggregation-induced emission nanodots and a detection method. The listeria monocytogenes detection kit comprises Cas12a protein, crRNA, a single-stranded nucleic acid fluorescent probe, an iron-tannic acid network coating aggregation-induced emission nanodot dispersion liquid, a Lamp element, a buffer solution and enzyme-free water. According to the present invention, the iron-tannic acid network coating aggregation-induced emission nano-dot is adopted as the light-emitting material, Cy5-ssDNA is adopted as the fluorescent probe, and the specific gene segment Listeria of Listeria monocytogenes is adopted as the target sequence to construct the two-color ratio fluorescent biosensor, and the two-color ratio fluorescent biosensor can be used for detection of Listeria monocytogenes in food, the method has the advantages of simplicity, no dependence on large instruments, low cost, short detection period, low background, high sensitivity, strong specificity, high efficiency, reliability and the like.

The application provides a carbon nanodot-based temperature sensor and a preparation method thereof. The carbon nanodot-based temperature sensor comprises, from bottom to top, a substrate layer, an interdigital electrode layer and a sensing layer. The sensing layer comprises hydrophilic carbon nanodot particles and an ionic salt. The sensing layer is formed by drop coating of a mixed aqueous solution of the hydrophilic carbon nanodot particles and the ionic salt. The preparation method is simple and easy to implement, and has low cost. The prepared temperature sensor has high sensitivity, high precision and high stability. The sensitivity of the temperature sensor reaches 345951.8%℃ ‑1 .

This invention discloses a composite material of carbon-supported silicon nanodots derived from a hierarchical porous metal-organic framework (MOF), relating to the field of lithium-ion battery anode materials. The invention includes preparing a hierarchical porous MOF precursor with both micropores and mesopores; converting the precursor into a hierarchical porous carbon framework through controlled heat treatment; confining the growth of silicon nanodots within the mesopores of the carbon framework via vapor deposition; and removing residual metals by acid washing to obtain a purified target composite material. By using a MOF with a hierarchical porous structure as a precursor and combining it with vapor deposition technology, this invention enables the in-situ construction of uniformly dispersed silicon nanodots within the mesopores of the derived carbon framework, while simultaneously maintaining an efficient ion transport network using a microporous system.

The invention relates to the technical field of high polymer materials, and discloses a super junction MOSFET device structure and a manufacturing method thereof, and the method comprises the steps: forming a catalyst nano dot matrix on a semiconductor substrate; and then, in a single and continuous epitaxial growth process, N-type pulses and P-type pulses are alternately executed at high frequency, so that catalyst-guided growth of the N-type semiconductor columns and selective epitaxial filling growth of the P-type semiconductor columns are realized, and a self-aligned super junction structure is formed. According to the method, an in-situ real-time optical monitoring system is utilized, and according to different thicknesses of an epitaxial layer in the initial growth stage, the middle growth stage and the final growth stage, the duration time of pulses is adjusted in a self-adaptive mode, and surface topology is compensated. The prepared super junction structure is an integral single crystal structure without a physical interface, so that an atomic-scale steep doped junction is realized, the process is simplified, interface defects are eliminated, and charge balance can be accurately controlled, thereby obtaining a device with low leakage current, high breakdown voltage uniformity and high surface flatness.

An electrocatalyst comprising bismuth nanodot-doped zinc materials is used for electrochemical reduction of carbon dioxide to formate. The electrocatalyst consists of bismuth nanodots dispersed on a zeolitic imidazolate framework-8 wherein the bismuth-zinc material is in the form of particles with a longest dimension of 200 to 1000 nm. The bismuth-zinc material is utilized in H cell, flow cell, and MEA cell applications for carbon dioxide reduction.

The invention discloses an orange fluorescent silicon nanodot, a preparation method thereof and an application of the orange fluorescent silicon nanodot in mitochondrial imaging in living cells, the method comprises the following steps: S1, dissolving tetramethyl rhodamine methyl ester in ultrapure water, then adding N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, uniformly stirring, and carrying out hydrothermal reaction on the obtained mixture; and S2, cooling after the reaction is finished, purifying the product by using a chromatographic column, eluting by using an eluent, collecting the eluent, and drying to obtain the orange fluorescent silicon nanodot. The silicon nanodot provided by the invention has the advantages of good light stability, high quantum yield and the like, and can be successfully applied to positioning imaging of mitochondria in living cells; compared with common blue-green fluorescence, orange fluorescence has better tissue penetrating ability and background interference resistance; the O-SiNDs prepared by the invention also has the property similar to that of lipophilic cations, and can realize high-specificity targeted marking on mitochondria of living cells.

The application provides a single-chain super-small fluorescent polymer nanodot modified Bacillus subtilis derived nanometer calcium carbonate composite material (SC-PNPs@CaCO3) as a high-sensitivity fluorescent sensing platform for choline acetyltransferase (ChAT) activity detection. The composite material is synthesized through biological mineralization of Bacillus subtilis, the free radical polymerization method is used to prepare the SC-PNPs with positive charges on the surface, and a stable fluorescent sensing system is constructed through self-assembly. Coenzyme A (CoA) is generated in the ChAT catalytic reaction, which can significantly quench the fluorescent signal of the material, realize high-sensitivity detection of the ChAT activity change, and the detection limit reaches 0.00074 mU / mL. The fluorescent sensing platform can realize real-time monitoring of the ChAT activity change, and reveal the regulation effect of the cholinergic signal pathway in the repair process in a skin repair model. The application provides an innovative technical means for choline acetyltransferase activity analysis, and provides a new research direction for exploring the function of the cholinergic system in skin repair and other physiological and pathological processes.

The application discloses a preparation method of an environment-friendly degradable single-side perspective sticker and belongs to the technical field of modified nanometer materials. The method comprises the following steps: (1) preparation of a multilayer composite structure: mixing polylactic acid and polybutylene succinate, adding nano-montmorillonite and a surface modifier to melt blend to form a first layer melt; stirring polybutylene adipate terephthalate and fluorescent carbon nanodots to form a second layer melt; and forming a film blank by co-extruding the first layer, a pressure-sensitive adhesive layer and the second layer; (2) construction of a nanometer film: biaxially stretching the film blank, pressing a micropore array, immersing in a silver nanoparticle suspension and drying to obtain a nanometer film; (3) functionalization treatment of a coating layer: immersing in a fluorine-containing nanometer coating solution and solidifying; and (4) post-treatment: secondary solidification. The obtained single-side perspective sticker is suitable for fields such as building and vehicle privacy films, and solves the problems of large pollution and slow degradation of traditional stickers.

The invention provides a light source transition area gradient light-emitting display screen based on a photonic crystal, which relates to the technical field of display screens and comprises a photonic crystal substrate, a light source module, a driving module, a feedback module and a data processing control end, the photonic crystal substrate is a silicon-based and polymer-based two-dimensional photonic crystal and is installed on a core optical layer of the display screen, non-uniform periodic gradient structures are periodically distributed on the surface of the photonic crystal substrate, the periodic change range is 50-200 nanometers, and a point defect microcavity array, a chiral structure, a sub-wavelength columnar metasurface array and a waveguide bending structure are embedded in the substrate. Aiming at the defects in the aspect of light field regulation and control in the prior art, smooth gradual change of a light field at a sub-wavelength level is realized through the non-uniform periodic gradient structure (the period is 50-200 nanometers) of the photonic crystal substrate, the point defect microcavity array and the waveguide bending structure; the problem of abrupt change of light intensity caused by traditional pixel-level brightness adjustment is solved.

The invention provides preparation of an ultra-small nano probe with efficient biomarker performance and super-resolution imaging application of the ultra-small nano probe. The nanodot is of a core-shell structure, and the core-shell structure comprises a fluorescent core, a fluorescent layer and a fluorescent layer, wherein the fluorescent core is composed of a single-chain semiconductor polymer; the shell layer is composed of an amphiphilic compound, a hydrophobic part of the amphiphilic compound is combined with the semiconductor polymer, a hydrophilic group is located on the surface of the shell layer to serve as an active group, the average particle size of the nanodot is smaller than 5 nm, and the nanodot is of a glassy structure. The nanodot can realize high-density specific marking of various subcellular organelles and nano-scale biological fluorescence imaging.

The invention discloses a metal nanodot in-situ deposition method based on an STM-MBE vacuum interconnection system and a semiconductor device. The STM-MBE vacuum interconnection system comprises an STM observation chamber, a vacuum sample transfer chamber and an MBE growth chamber which are sequentially butted and isolated; the in-situ deposition method comprises the following steps: introducing a metal source into an MBE growth chamber so as to deposit a wrapping layer on the surface of an STM needle tip in the MBE growth chamber; the substrate in the MBE growth chamber and the STM needle point deposited with the wrapping layer are conveyed to an STM observation chamber through a vacuum sample conveying chamber; and a voltage pulse module in the STM observation cavity is used for generating a pulse signal, so that the wrapping layer on the surface of the STM needle tip is converted into a molten state and deposited on the substrate in a nanodot form, and the metal nanodot is obtained. According to the in-situ deposition method, controllable nanoscale deposition of the metal source can be achieved, and the electrical / quantum performance of the metal source is fully guaranteed.

The application discloses a kind of ZnIn2S4 / amorphous MoO 3‑x Preparation and application of nanodot Z system photocatalyst, it relates to the field of photocatalysis.It is simple to operate, environment-friendly, and the prepared ZnIn2S4 / amorphous MoO 3‑x Nanodot catalyst has excellent hydrogen production performance and stability.First, amorphous MoO 3‑x Nanodot is synthesized by ultrasonic chemical method, then MoO 3‑x Nanodot is loaded on ZIS by one-pot hydrothermal method, and ZM catalyst is obtained.First, a certain amount of ZM catalyst is weighed and placed in a quartz photo-reactor, then triethanolamine aqueous solution without dissolved oxygen is added, argon is introduced to exhaust air, and the reactor is sealed.The reactor is placed in a magnetic stirrer and the temperature of the reactor is maintained by a constant-temperature tank.The application improves the electron-hole separation efficiency of the composite catalyst, reduces the recombination efficiency, and expands the light absorption range.

This invention relates to the field of environmental pollutant detection, specifically to the application of organosilicon nanodots and their hydrogel sensors in the detection of tetrabromobisphenol A (TBA) concentration. The method includes: uniformly mixing an organosilicon nanodot stock solution with a sample to be tested, allowing it to stand in the dark to obtain a test solution; acquiring the sample fluorescence intensity value of the test solution at a specific wavelength, and the control fluorescence intensity value of a blank control solution without the test sample; calculating the quenching efficiency based on the sample fluorescence intensity value and the control fluorescence intensity value; and calculating the TBA concentration of the sample to be tested based on the quenching efficiency and a standard working curve; wherein the standard working curve is obtained by fitting the concentration of a TBA standard solution and its corresponding quenching efficiency. This invention aims to provide a simple, efficient, environmentally friendly, highly sensitive, and highly selective method for detecting TBA concentration.

The application relates to the technical field of composite materials, in particular to a CdS-NiCo-LDH composite material and a preparation method and application thereof. In the application, NiCo-LDH is obtained through a hydrothermal reaction, then CdS nanodots are introduced into the interlayer of the NiCo-LDH through an electrochemical reaction and in-situ sulfuration, so that the interlayer spacing is increased, the transportation of OH- is facilitated, the conductivity of the CdS nanodots is improved, the electron migration is facilitated, and the electrochemical reaction active sites are increased. Meanwhile, the in-situ synthesis method not only avoids the adverse influence of secondary growth, but also reduces the volume expansion of the NiCo-LDH in the redox reaction process.

The present application relates to the field of high-temperature-resistant film, co-doped nanocrystals and surface matrix material, and particularly relates to a polyimide matrix co-doped nanocrystal film and a preparation method thereof. A co-doped nanocrystal precursor modified reverse-phase fine emulsion is prepared first, and then a dispersion containing the co-doped nanocrystal precursor and polyamic acid is prepared; then, the dispersion containing the co-doped nanocrystal precursor and polyamic acid is spin-coated on a clean quartz glass sheet, and is placed in a replaceable air oven for drying to obtain a polymer matrix co-doped film; finally, after sintering and cooling, a polyimide matrix co-doped film is obtained. The thickness of the polyimide matrix co-doped film can be controlled within 80-500 nanometers, and the base film is flat; the co-doped nanocrystals are uniformly distributed in the form of nanodots on the matrix film; the film can be used at high temperature, the base film does not deform, and the co-doped nanodots have good adhesion.

The application discloses a growth method of a strain cooperative regulation Ge / GaInAs epitaxial structure, and the epitaxial structure comprises, from bottom to top, a GaInP nucleation layer, a GaInAs matching buffer layer, a bottom tunnel junction n-GaAs / p-AlGaAs, an AlGaInAs lattice buffer layer, a self-assembled Ga nanodot array, a target GaInAs matching buffer layer, a target GaInAs layer, an AlInP window layer and a GaInAs cap layer on a germanium substrate. 0.1 As matching buffer layer, bottom tunnel junction n-GaAs / p-AlGaAs, Al k Ga 1‑x In x As lattice buffer layer, self-assembled Ga nanodot array, Al k Ga 1‑y In y As target matching buffer layer, Ga 1‑y In y As target layer, Al 1‑z In z P window layer and Ga 1‑y In y As cap layer. The application combines defect engineering of self-assembled nanodots and atom-level smooth growth of migration enhanced epitaxy, reconstructs an epitaxial starting interface on a nanometer scale, forms a triple system of a nucleation layer, a lattice buffer layer and a nanodot array, and realizes three-dimensional and multi-scale inhibition of dislocations and point defects.

This invention relates to the field of luminescent materials technology, specifically to a method for preparing room-temperature solid-state phosphorescent stable dual-matrix carbon nanodots and their applications. The method uses dextrin, 3-aminopropyltriethoxysilane, and boric acid as raw materials. By simultaneously introducing a silicon matrix and a boron matrix to form a dual-matrix system, the method combines the excellent stability of the silicon matrix with the unique electronic modulation capabilities of boron. Room-temperature solid-state phosphorescent stable dual-matrix carbon nanodots are synthesized via a hydrothermal method. After three cycles of water immersion-drying, the phosphorescence intensity of the obtained dual-matrix carbon nanodots decreases by only 6% to 7%. The carbon nanodots synthesized by this method have broad application prospects in the fields of anti-counterfeiting and information encryption.

The invention discloses a blue fluorescent silicon nanodot, a preparation method thereof and application of the blue fluorescent silicon nanodot in rapid detection of thiabendazole, the method comprises the following steps: S1, adding hydroquinone into ultrapure water, then adding 3-aminopropyltrimethoxysilane, uniformly stirring, and carrying out hydrothermal reaction on the obtained mixture; and S2, cooling after the reaction is finished, purifying the product by using a silica gel chromatographic column, eluting by using an eluent, collecting the eluent, and freeze-drying to obtain the blue fluorescent silicon nanodots. The silicon nanodot provided by the invention has excellent light stability and high quantum yield, and shows a remarkable fluorescence quenching effect in the presence of thiabendazole; the method for rapidly detecting the thiabendazole is further constructed by utilizing the characteristics, has the advantages of low detection limit, accurate and reliable detection and the like, can realize rapid and reliable detection of pesticide residues, and provides an efficient and practical technical approach for food safety and quality monitoring.

A two-electrode memory device includes a substrate, a floating gate disposed on the substrate and configured to store electrons, a tunneling insulating film disposed on the floating gate and configured provide electron tunneling, a channel disposed on the tunneling insulating film, a source electrode and a drain electrode that are each disposed on the tunneling insulating film and have electrical connection with the channel, and a plurality of metal nanodots disposed in the tunneling insulating film.

The invention discloses a silicon nanodot, a high-performance super-long continuous light-emitting silicon nanodot composite material, a preparation method of the composite material and an application of the composite material in information encryption, and develops an economical, simple, convenient and innovative strategy, the silicon nanodot is integrated into a composite matrix, and the composite material is prepared. And the high photoluminescence quantum yield of the SiNDs is effectively combined with the stability of a substrate to triplet excitons. The phosphorescence quantum yield (PhQY) of the obtained material is up to 81.04%, the afterglow life is as long as 3.44 seconds, meanwhile, macroscopic cyan emission is accompanied, the duration time is up to 52 seconds, and the material is one of reported long-afterglow luminescent systems with the best performance. The high-performance multicolor long afterglow material is obtained with lower manufacturing cost and a simpler technological process, the problems that an existing afterglow material is low in phosphorescence quantum yield, single in function, potential in pollution and the like are effectively solved, and a new solution is provided for the field of information encryption and the like.

The invention relates to the technical field of phonon engineering, and provides a method for regulating and controlling the thermal conductivity of a crystalline silicon film structure of phonon interference resonance, which comprises the following steps: constructing a crystalline silicon film phonon interference model structure, and arranging periodically distributed nano-pillar arrays on the surfaces of the two sides of the crystalline silicon film phonon interference model structure as a heat source and a cold source, the period length of the nanorod is set to be adjustable, and a crystalline silicon film model structure containing a periodic heat source and a periodic cold source is obtained; obtaining the dominant phonon wavelength of the crystalline silicon film at the target temperature; adjusting the cycle length of the heat source and the cold source, matching the cycle length with the dominant phonon wavelength of the crystalline silicon film at the target temperature, and inducing multi-channel phonon interference resonance; the thermal conductivity of the crystalline silicon film phonon interference model structure is calculated through unbalanced molecular dynamics simulation, and a thermal conductivity calculation result after regulation and control is obtained; phonon interference and local resonance phenomena are effectively induced by adjusting a periodic nano-point heat source / cold source structure, and a heat conductivity, temperature and length correlation rule is obtained.

An electrode structure includes a conductive electrode, the conductive electrode including a first surface, an insulating layer on the conductive electrode, the insulating layer being in contact with the first surface of the conductive electrode, and a nano dot pattern in the conductive electrode and spaced apart from the first surface of the conductive electrode, the nano dot pattern including nano dots arranged in parallel to the first surface of the conductive electrode, and each of the nano dots including a first side surface adjacent to the first surface of the conductive electrode, the first side surface being flat and parallel to the first surface of the conductive electrode, and a second side surface opposite to the first side surface, the second side surface being convex in a direction away from the first surface of the conductive electrode.

This invention discloses a red fluorescent silicon nanodot, its preparation method, and its application. The method includes the following steps: S1, dissolving 2-nitro-4-aminodiphenylamine in anhydrous ethanol, then adding 3-aminopropyltriethoxysilane and stirring until homogeneous; S2, transferring the mixture obtained in step S1 to a reaction vessel and reacting under heating; S3, after the reactants have cooled to room temperature, eluting and purifying them using a silica gel chromatography column; S4, lyophilizing the purified product to obtain red fluorescent silicon nanodots. The red fluorescent silicon nanodots provided by this invention not only possess photostability and high quantum yield but also contain lipophilic cations, enabling them to target mitochondria in living cells; furthermore, these silicon nanodots also have the ability to penetrate the blood-brain barrier; the invented red fluorescent silicon nanodots can be applied to mitochondrial dynamic tracking imaging and blood-brain barrier penetration imaging, and are expected to provide a potentially powerful tool for diagnosing mitochondrial-related brain diseases.

The invention provides an ultra-small-size high-brightness nanoprobe and a single protein tracking application thereof, the nanodot is of a core-shell structure, and the core-shell structure comprises: a fluorescent core, which is formed by a single-chain semiconductor polymer; the shell layer is formed by an amphiphilic compound, a hydrophobic part of the amphiphilic compound is combined with the semiconductor polymer, a hydrophilic group is located on the surface of the shell layer to serve as an active group, and the average particle size of the nanodot is smaller than 5 nm. The single-chain ultra-small polymer point provided by the invention can realize high temporal-spatial resolution tracking of a single motor protein in a living cell, and can accurately analyze the motion step length of about 16 nm.

The application discloses a preparation method of semiconductor-phase FeS ultra-small nanodots, which comprises the following steps: S1, preparing metal-phase FeS ultra-small nanodots; S2, dispersing the metal-phase FeS ultra-small nanodots in ethylene glycol containing sodium citrate, carrying out high-temperature hydrothermal reaction in an inert atmosphere, purifying the product, and then dispersing the product in ultrapure water to obtain the semiconductor-phase FeS ultra-small nanodots. The method is simple, fast, efficient, low in cost, high in reproducibility, convenient for batch production, and safe in operation, and is a method for rapidly synthesizing semiconductor-phase FeS ultra-small nanodots.

An embodiment memory device includes a drain electrode disposed on a semiconductor substrate, a channel region in contact with the drain electrode, a source electrode in contact with the channel region, and a floating gate region in contact with the source electrode and the drain electrode, the floating gate region including a nano-dot region including at least one nano-dot gate, wherein the drain electrode is overlapped with the nano-dot region, and wherein the nano-dot region is overlapped with the channel region.

The application discloses a kind of photo-thermal catalyst, the photo-thermal catalyst is Bi@Bi5O7Br Composite nanotube, Bi5O7Br nanotube has atomic level thickness, the wall thickness of Bi5O7Br nanotube is 0.8-2.0nm;Bi Nanodot is dispersed in Bi5O7Br nanotube inside, average diameter is 2-4nm.The preparation method of the photo-thermal catalyst, including: the mannitol solution of Bi (NO3) 3·5H2O and PVP is mixed with the mannitol solution of NaBr, and mixed liquor is obtained;The PH of mixed liquor is adjusted to 10-12, then by hydrothermal reaction is obtained;The hydrothermal reaction temperature is 120-160 DEG C, and the holding time is 30-60min.The photo-thermal catalyst can be applied in catalytic reduction CO2 in the application, the yield of CO reaches mmol·g ‑1 ·h ‑1 Horizontal, compared with the yield under the condition of separate light, more than one order of magnitude is increased.