Nano displacement controller and displacement control method for anti-honeycomb paper-cut structure

Abstract

The invention belongs to the technical field of micro-nano devices, and discloses an anti-honeycomb paper-cut structure nano displacement controller and a displacement control method. The nano displacement controller with the anti-honeycomb paper-cut structure comprises a restraint layer, a deformation section and a functional section, the restraint layer comprises a nano substrate formed by graphene; the functional section comprises a carbon nano tube and generates displacement under the action of an electric field to enable the deformation section to deform; the deformation section comprises a nanometer spring composed of anti-honeycomb-shaped graphene paper-cut, so that the functional section recovers to the initial position after displacement is generated. Due to the fact that the anti-honeycomb-shaped graphene paper-cut structure has the excellent limit elastic deformation rate, the extremely large limit elastic tensile length can be generated, and the displacement controller can achieve gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt and gt under electric field control. And meanwhile, the displacement control and positioning capability with quick response (nanosecond level), accurate control and nanoscale precision is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of micro-nano devices, and in particular to an inverse honeycomb paper-kirigami structure nano displacement controller and a displacement control method. Background Art

[0002] Since the beginning of this century, the research and application of low-dimensional materials have achieved breakthrough progress. This has laid the foundation for the miniaturization of devices. Nanoelectromechanical systems combine the design principles of microelectromechanical systems and the scale effects of nanomaterials, aiming to achieve more efficient signal processing, energy conversion and material transmission. At present, the design of nanoelectromechanical systems has become one of the global research hotspots. Although some progress has been made in the preparation and application of carbon-based nanomaterials such as carbon nanotubes and graphene, the atomic-scale precision processing and production of nanomaterials, structures, and devices are still in the exploratory stage. To achieve more complex and finer control and processing is still one of the important challenges of current research. Precision processing and assembly at the atomic scale, especially for more complex and finer structures, requires innovative processing technology and precise control methods.

[0003] Nanoscale displacement control is of great significance for exploring the transport state of nanoscale objects and constructing nanostructures at lower scales. At the same time, nanoscale displacement control can not only achieve precise operation of nanoscale systems under laboratory conditions, but also provide an important tool for understanding and utilizing the unique properties of nanomaterials. It is crucial to explore and develop a device that can quickly and accurately achieve nanoscale displacement control.

[0004] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide an inverted honeycomb paper-kirigami structure nano-displacement controller and a displacement control method, aiming to solve the problem that the prior art lacks devices that can quickly and accurately achieve nano-level displacement control.

[0006] The technical solution of the present invention is as follows:

[0007] A first aspect of the present invention provides an inverted honeycomb kirigami structure nano displacement controller, comprising a constraining layer, a deformation section and a functional section;

[0008] The constraint layer is used to limit the displacement of the deformation section, and the constraint layer includes a nano substrate and a first nano base block and a second nano base block respectively located at two ends of the nano substrate, and the nano substrate is a graphene material;

[0009] The deformation section includes a nano spring, and the nano spring is an inverse honeycomb graphene paper-cut, which is used to restore the functional section to an initial position after displacement;

[0010] The functional section includes a carbon nanotube, which is displaced under the action of an electric field and causes the nanospring to deform;

[0011] The nano spring and the carbon nano tube are both attached to the nano substrate through the van der Waals force between graphene layers. One end of the nano spring is fixedly connected to the carbon nano tube through atomic stacking, and the other end of the nano spring is fixedly connected to the first nano base block or the second nano base block through atomic stacking.

[0012] Optionally, the nano substrate consists of 1-3 layers of graphene.

[0013] Preferably, the nano substrate consists of 3 layers of graphene.

[0014] Optionally, the dimensions of the nano substrate are: 80-120 nm in length and 30-60 nm in width.

[0015] Preferably, the dimensions of the nano substrate are: 85 nm in length and 35 nm in width.

[0016] Optionally, the nanospring is a double-layer inverse honeycomb graphene kirigami.

[0017] Optionally, the dimensions of the nanospring in an initial state are: 30-50 nm in length and 10-30 nm in width.

[0018] Preferably, the dimensions of the nanospring deformation segment in an initial state are: 42 nm in length and 25 nm in width.

[0019] Optionally, the functional segment is a (17, 0) type carbon nanotube.

[0020] A second aspect of the present invention provides a displacement control method, the displacement control method is based on the inverted honeycomb kirigami structure nano displacement controller according to any one of claims 1 to 9, the displacement control method comprising:

[0021] In the initial state, the nano spring and the carbon nano tube are stably attached to the nano substrate through the van der Waals force between graphene layers;

[0022] In the working state, an electric field is applied along the direction from the nano spring to the carbon nano tube, and the carbon nano tube is displaced under the action of the electric field force, and pulls the nano spring to deform and maintain a stable state at the equilibrium position;

[0023] After the electric field is unloaded, the carbon nanotubes recover from the equilibrium position to the initial state under the combined action of the restoring force generated by the deformed nanosprings and the van der Waals force of the nano substrate.

[0024] Beneficial effects: The present invention provides a nano displacement controller with an inverted honeycomb paper-cut structure and a displacement control method, wherein the nano displacement controller with an inverted honeycomb paper-cut structure comprises a constraint layer, a deformation section and a functional section; the constraint layer comprises a nano substrate composed of graphene; the functional section comprises carbon nanotubes, which generate displacement under the action of an electric field to deform the nano spring; the deformation section comprises a nano spring composed of inverted honeycomb graphene paper-cut, which is used to restore the functional section to its initial position after the displacement. The inverted honeycomb graphene paper-cut structure has an excellent ultimate elastic deformation rate and can produce a very large ultimate elastic stretching length, so the inverted honeycomb paper-cut structure can produce a deformation or displacement of more than 70%. Therefore, the displacement controller provided by the present invention can achieve large deformation / displacement (>70%), fast response (nanosecond level) and accurate control of nanometer-level precision displacement control under electric field control. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of the anti-honeycomb paper-kirigami structure nano-displacement controller provided by the present invention.

[0026] Figure 2 A comparison of the end tension-tensile deformation curves of graphene kirigami with different structures and their use as nanosprings in nano-displacement controllers.

[0027] Figure 3 Schematic diagram of the deformation of the anti-honeycomb graphene paper-kirigami nanospring in the anti-honeycomb paper-kirigami structure nano-displacement controller provided by the present invention during the stretching process.

[0028] Figure 4 A schematic diagram of the operating status of the anti-honeycomb paper-kirigami structure nano-displacement controller provided by the present invention.

[0029] Figure 5 A curve diagram showing the relationship between displacement and field strength of a functional segment in the inverted honeycomb paper-kirigami structure nano displacement controller provided by the present invention; DETAILED DESCRIPTION

[0030] The present invention provides an inverse honeycomb paper-kirigami structure nano displacement controller and a displacement control method. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] Unless otherwise defined, all technical terms and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0032] The embodiment of the present invention provides an inverted honeycomb kirigami structure nano displacement controller, comprising a constraint layer, a deformation section and a functional section;

[0033] The constraint layer is used to limit the maximum deformation of the deformation section to prevent the nanospring 1 from exceeding the deformation limit and affecting the service life of the device.

[0034] The constrained layer includes a nano-base and a first nano-base block and a second nano-base block respectively located at two ends of the nano-base.

[0035] The nano-base block is produced by extruding graphene and serves as a displacement limit for the nano-spring and the end of the carbon nanotube; and the nano-base is a graphene material.

[0036] The deformation section includes a nano spring, and the nano spring is an inverse honeycomb graphene paper-cut, which is used to restore the functional section to an initial position after displacement;

[0037] The functional section includes a carbon nanotube, which is displaced under the action of an electric field and causes the nanospring to deform;

[0038] The nano spring and the carbon nano tube are both attached to the nano substrate through the van der Waals force between graphene layers. Since the materials of the nano spring and the nano substrate are both graphene, the deformation section and the functional section are attached to the nano substrate and slide through the van der Waals force, which can improve the operating stability of the displacement control device.

[0039] One end of the nano spring is fixedly connected to the carbon nano tube through atomic stacking, and the other end of the nano spring is fixedly connected to the first nano block or the second nano block through atomic stacking.

[0040] In some embodiments, the nanosubstrate consists of 1-3 layers of graphene.

[0041] In some preferred embodiments, the nano substrate is composed of three layers of graphene, which can eliminate the influence of intermolecular forces other than the nano substrate on the displacement control device.

[0042] In some embodiments, the dimensions of the nano substrate are: 80-120 nm in length and 30-60 nm in width.

[0043] In some preferred embodiments, the dimensions of the nano substrate are: 85 nm in length and 35 nm in width.

[0044] In some specific embodiments, the nanospring is a double-layer inverse honeycomb graphene paper-cut, which can achieve large deformation of the nanospring. The inverse honeycomb graphene paper-cut can be obtained by nano-etching technology. When the graphene in the inverse honeycomb paper-cut structure is deformed, the graphene strips are mainly bent and folded. The graphene material is extremely soft and easy to fold, so the inverse honeycomb graphene paper-cut structure can produce a larger deformation.

[0045] In some embodiments, the dimensions of the nanospring in the initial state are: 30-50 nm in length and 10-30 nm in width.

[0046] In some preferred embodiments, the dimensions of the nanospring deformation segment in the initial state are: 42 nm in length and 25 nm in width.

[0047] In some embodiments, the functional segment is a (17, 0) type carbon nanotube, which generates displacement under the action of an electric field and causes the nanospring to deform.

[0048] The embodiment of the present invention further provides a displacement control method, which is based on the inverted honeycomb kirigami structure nano displacement controller according to any one of claims 1 to 9, and comprises:

[0049] In the initial state, the nano spring and the carbon nano tube are stably attached to the nano substrate through the van der Waals force between graphene layers;

[0050] In the working state, an electric field is applied along the direction from the nano spring to the carbon nano tube, and the carbon nano tube is displaced under the action of the electric field force, and pulls the nano spring to deform and maintain a stable state at the equilibrium position;

[0051] After the electric field is unloaded, the carbon nanotubes recover from the equilibrium position to the initial state under the combined action of the restoring force generated by the deformed nanosprings and the van der Waals force of the nano substrate.

[0052] The following describes it in detail through specific embodiments.

[0053] Example

[0054] (1) Nano-substrate preparation

[0055] The chemical vapor deposition (CVD) method is used to decompose carbon source gases such as methane at high temperature to deposit a graphene film on the substrate. The graphene film is transferred to the target substrate by mechanical peeling or wet transfer to form a three-layer graphene structure.

[0056] (2) Preparation of Nano-Base Blocks

[0057] The graphene sheet is cut and folded using nano-kirigami technology to form the desired shape of the nano-block. The nano-block is fixed on the left and right sides of the nano-substrate by stacking carbon atoms.

[0058] (3) Preparation of nanosprings

[0059] Ion beam / electron beam etching technology is used to etch an inverse honeycomb structure on the graphene film to form a nano spring. One end of the nano spring is fixedly connected to the carbon nano block on the left side of the nano substrate through carbon atom accumulation.

[0060] (4) Functional segment preparation

[0061] Carbon nanotubes are grown on a catalyst substrate by chemical vapor deposition, and the charged carbon nanotubes are fixedly connected to the other end of the nanospring by carbon atom accumulation.

[0062] (5) Overall assembly

[0063] The components are assembled into a complete anti-honeycomb paper-kirigami nano displacement controller, the structure of which is as follows: Figure 1 As shown, the device includes: a constrained layer, a deformation section, and a functional section, wherein the constrained layer includes a nano substrate 3, a first nano block 4, and a second nano block 5, and the first nano block 4 and the second nano block 5 are fixed on the left and right sides of the nano substrate, respectively. The deformation section includes a nano spring 1, and the functional section includes a carbon nano tube 2, one end of the nano spring 1 is fixedly connected to the carbon nano tube 2, and the other end of the nano spring 1 is fixedly connected to the first nano block 4.

[0064] The working process of the inverted honeycomb paper-cut structure nano displacement controller is as follows: in the initial state, the nano spring 1 and the carbon nano tube 2 are stably attached to the nano substrate 3 due to the van der Waals force between the graphene layers; in the working state, an electric field is applied along the direction of the nano spring 1-carbon nano tube 2, and the carbon nano tube 2 is subjected to the electric field force, pulling the nano spring 1 of the multi-layer inverted honeycomb paper-cut graphene to deform, and it stabilizes to a balanced position under the combined action of the electric field force and the elongation force of the deformable section, and the time it takes to reach a stable state is less than 0.5ns; when the electric field is unloaded, the carbon nano tube 2 is subjected to the internal force of the nano spring 3 and the van der Waals force of the nano substrate 3, and the carbon nano tube 2 returns to the initial state, ensuring the repeatability of its movement. The inverted honeycomb paper-cut structure nano displacement controller of the present invention can achieve fast (nanosecond level) and accurate nano-level displacement control and positioning capabilities.

[0065] In this embodiment, the inverted honeycomb graphene paper-cut is used as a nanospring because when the graphene strips have the same length, the inverted honeycomb paper-cut graphene structure has the largest limit elastic deformation rate and can produce the largest limit elastic stretching length. Figure 2As shown, the anti-honeycomb structure can produce a large deformation of over 70%, which is twice that of the orthogonal structure and five times that of the standard honeycomb structure and perfect graphene material. The deformation produced by the anti-honeycomb structure is 1.7 times that of the orthogonal structure and 3.4 times that of the standard honeycomb structure. The main reason for this result is that the orthogonal and anti-honeycomb paper-cut graphene structures are mainly bent and folded when deformed, while the standard honeycomb paper-cut graphene structure is mainly stretched during the deformation process. Graphene materials are extremely soft and easy to fold. Therefore, the orthogonal and anti-honeycomb graphene paper-cut structures can produce greater deformation, and the anti-honeycomb type has greater deformation due to its structural design.

[0066] like Figure 3 As shown, in the anti-honeycomb paper-kirigami structure nano displacement controller provided by the present invention, the tensile force-deformation curve of the nano-spring anti-honeycomb graphene paper-kirigami can be divided into four different stages:

[0067] The first stage is the low-load large deformation stage, in which each rod in the structure produces in-plane and out-of-plane rotation around the connection point, and the structure produces multiple out-of-plane deformation, which is the basis for the kirigami nanospring to produce large deformation.

[0068] The second stage is the large deformation hardening stage. As the carbon-carbon bonds in the system elongate, the end force increases sharply. Since the ends of the structure are restricted by lateral displacement, the middle part of the structure deforms unevenly, resulting in an arc-shaped contraction in the middle of the structure. At the same time, the out-of-plane deformation of the structure gradually decreases as the strips are tightened.

[0069] The third stage is the structural yield stage, when carbon-carbon bonds begin to break and quickly cause the destruction of some elementary structures;

[0070] In the fourth stage, the spring is further stretched until it fails.

[0071] The displacement control performance of the anti-honeycomb kirigami structure nano displacement controller was tested under the action of an electric field. The relevant tests were carried out in the open source software LAMMPS using the molecular dynamics simulation method. The test model is as follows:

[0072] The inverse honeycomb kirigami nano-displacement controller consists of four key components: a multi-layer inverse honeycomb graphene kirigami nano-spring that can produce large deformations; end-charged carbon nanotubes responsible for driving the device movement; a single-layer graphene substrate that provides support and restriction for the nano-springs; and an external control electric field E(t) to drive the movement of the charged carbon nanotubes.

[0073] The size of the nanospring is about 25nm*42nm. The spring is composed of a graphene strip 1 parallel to the direction of movement and a graphene strip 2 inclined to the direction of movement. The length of strip 1 is 4.92nm and the width is 0.85nm. The length of strip 2 is 2.95nm and the width is 0.85nm.

[0074] The left end of the nanospring is fixed, and the right end is connected to the end of a carbon nanotube with a chiral index of (17, 0). The carbon tube is slightly longer than the width of the nanospring, for example, 31 nm in the model. At the same time, each carbon atom in the carbon tube carries a charge of +0.1e.

[0075] The nanospring and the end-charged carbon tube are placed on a graphene substrate of 85nm*35nm in size.

[0076] In each simulation, the following steps are performed:

[0077] Step 1: Import the molecular dynamics model of the nano displacement controller; select the potential function and determine the relevant parameters;

[0078] Step 2: Reshape the initial model by minimizing the potential energy;

[0079] Step 3: The movable parts relax in the NVT ensemble for 200 ps;

[0080] Step 4: Apply a constant electric field parallel to the direction of the slide rail to the model;

[0081] Step 5: The system runs under the NVT ensemble to extract the end position information and the total potential energy of the system;

[0082] Step 6: Post-processing.

[0083] The interaction between atoms is described by a mixed potential function of AIREBO potential and LJ potential. The carbon-carbon bond and carbon-hydrogen bond interactions are described by AIREBO potential, and the non-bonded interaction between components is described by LJ potential. The carbon-carbon bond cutoff radius in the AIREBO potential function is set to The steepest descent method is used to minimize the initial potential energy of the system. The temperature of the system in the typical NVT ensemble is controlled by the Nosé-Hoover thermostat control method. The time step of the time integration is set to 0.001ps. During the test, the temperature is controlled at 8K and the electric field is constant. The test results are shown in Figure 4 and 5 shown.

[0084] like Figure 4As shown, in the initial state, the spring and the charged carbon tube are stably attached to the graphene substrate due to the interlayer van der Waals force; in the working state, the nanospring is attached to the graphene and moves, and the device operates stably; after unloading the electric field, when the structure shrinks to a stable state, it remains in a stable state extremely close to the initial state, ensuring the stability and accuracy of the device during long-term operation.

[0085] like Figure 5 As shown, the results indicate that the nano spring of the anti-honeycomb paper-kirigami structure displacement controller provided by the embodiment of the present invention is a nonlinear spring, and the field strength is exponentially correlated with the target position.

[0086] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. An inverse honeycomb paper-kirigami structure nano-displacement controller, characterized in that: It includes a constraint layer, a deformation segment and a functional segment; The constraint layer is used to limit the displacement of the deformation section, and the constraint layer includes a nano substrate and a first nano base block and a second nano base block respectively located at two ends of the nano substrate, and the nano substrate is a graphene material; The deformation section includes a nano spring, and the nano spring is an inverse honeycomb graphene paper-cut, which is used to restore the functional section to an initial position after displacement; The functional section includes a carbon nanotube, which is displaced under the action of an electric field and causes the nanospring to deform; The nano spring and the carbon nano tube are both attached to the nano substrate through the van der Waals force between graphene layers. One end of the nano spring is fixedly connected to the carbon nano tube through atomic stacking, and the other end of the nano spring is fixedly connected to the first nano base block or the second nano base block through atomic stacking.

2. The inverse honeycomb kirigami structure nano displacement controller according to claim 1, characterized in that: The nano substrate consists of 1 to 3 layers of graphene.

3. The inverse honeycomb paper-kirigami structure nano-displacement controller according to claim 2, characterized in that: The nano substrate consists of three layers of graphene.

4. The inverse honeycomb kirigami structure nano displacement controller according to claim 1, characterized in that: The dimensions of the nano substrate are: 80-120 nm in length and 30-60 nm in width.

5. The inverse honeycomb kirigami structure nano displacement controller according to claim 4, characterized in that: The dimensions of the nano substrate are: 85 nm in length and 35 nm in width.

6. The inverse honeycomb kirigami structure nano displacement controller according to claim 1, characterized in that: The nano spring is a double-layer inverse honeycomb graphene paper-cut.

7. The inverse honeycomb kirigami structure nano displacement controller according to claim 6, characterized in that: The dimensions of the nano spring in the initial state are: 30-50 nm in length and 10-30 nm in width.

8. The inverse honeycomb kirigami structure nano displacement controller according to claim 7, characterized in that: The dimensions of the nano-spring deformation section in the initial state are: 42 nm in length and 25 nm in width.

9. The inverse honeycomb kirigami structure nano displacement controller according to claim 1, characterized in that: The functional segment is a (17, 0) type carbon nanotube.

10. A displacement control method, characterized in that: The displacement control method is based on the inverse honeycomb kirigami structure nano displacement controller according to any one of claims 1 to 9, and the displacement control method comprises: In the initial state, the nano spring and the carbon nano tube are stably attached to the nano substrate through the van der Waals force between graphene layers; In the working state, an electric field is applied along the direction from the nano spring to the carbon nano tube, and the carbon nano tube is displaced under the action of the electric field force, and pulls the nano spring to deform and maintain a stable state at the equilibrium position; After the electric field is unloaded, the carbon nanotubes recover from the equilibrium position to the initial state under the combined action of the restoring force generated by the deformed nanosprings and the van der Waals force of the nano substrate.

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