Method for regulating friction coefficient of two-dimensional material by changing atomic ratio

Abstract

The application discloses a method for regulating friction coefficient of two-dimensional material by changing atomic ratio. The method is to replace different proportions of carbon atoms in boron nitride to form h-BCN with different carbon atomic ratios, and then change the atomic potential surface of the two-dimensional material to achieve the effect of regulating friction. Graphene two-dimensional material is selected as a friction component and placed on the h-BCN. The sliding speed of the friction component is 10 m / s, the normal pressure of the friction component contacting with the h-BCN is 0.001 to 0.1 nN / atom, and the sliding is along the armchair direction, so that the friction of the h-BCN with different carbon atomic ratios can be obtained. The friction of the h-BCN gradually decreases with the increase of the carbon atomic ratio, reaches the minimum value when the carbon atomic ratio is 0.4, and then gradually increases, and the friction changes in a non-monotonic manner. The method has the beneficial effects that the friction of the two-dimensional material can be flexibly regulated by using the method.

Description

Technical Field

[0001] This invention relates to the field of nano-friction control, specifically a method for controlling the friction coefficient of two-dimensional materials by changing the atomic ratio. Background Technology

[0002] Two-dimensional materials, due to their unique physical and chemical properties, have shown great potential for development in applications such as composite materials, energy storage devices, sensing devices, and filtration devices. Since the successful isolation of graphene in 2004, an increasing number of two-dimensional materials, such as boron nitride (h-BN), molybdenum disulfide (MoS2), and silicene, have been fabricated and extensively studied. Graphene has been the most extensively studied; its planar honeycomb lattice structure gives it very high carrier mobility, excellent thermal conductivity, and mechanical properties. However, its zero band gap makes it difficult to apply in electronic devices. In contrast, h-BN, while possessing a planar honeycomb lattice structure, has a wide band gap of 6 eV and is an insulator. Therefore, by constructing a two-dimensional heterostructure composed of C, B, and N atoms within the honeycomb lattice structure, the band gap can be tuned to make it a semiconductor. Recently, through atomic substitution doping and chemical vapor deposition, we have successfully synthesized two-dimensional hexagonal lattice heteromaterials (h-BCN) with various atomic ratios of C, B, and N atoms. Their band gaps can be tuned by atomic ratios, making them very suitable for electronic applications.

[0003] h-BCNs not only have significant potential applications in electronics, but also in mechanical engineering, particularly in friction control. For friction control, using two-dimensional materials offers advantages such as resistance to chemical changes, extremely small material thickness, and the ability to operate in low-temperature vacuum. With the increasing use of micro- and nano-devices, the rational control of surface friction can help devices such as micro- and nano-sensors and nanogenerators achieve greater efficiency. Currently, most existing friction control methods aim to reduce friction, such as reacting with solutions, controlling the operating environment, and mechanical scraping. These control processes are monotonously decreasing, potentially damaging the material or placing certain requirements on the substrate.

[0004] Therefore, we hope to find a non-monotonic method that does not damage the two-dimensional material and does not require a substrate material to adjust the friction of the two-dimensional material. Summary of the Invention

[0005] To address the aforementioned problems, this invention proposes a method for controlling the friction coefficient of two-dimensional materials by altering the atomic ratio. This method involves replacing carbon atoms in boron nitride with different proportions to form h-BCN with varying carbon atom ratios, thereby changing the atomic potential energy surface of the two-dimensional material and ultimately controlling friction.

[0006] Specifically, the objective of this invention is achieved through the following technical solutions: By replacing carbon atoms in boron nitride with different proportions, h-BCN with different carbon atom ratios are formed, thereby changing the atomic potential energy surface of the two-dimensional material and thus achieving the effect of controlling friction.

[0007] Furthermore, the length and width of the two-dimensional material are 20-500 nm.

[0008] Furthermore, the two-dimensional material is divided into 80-500 equally long rectangular regions along the direction of the material armchair.

[0009] Furthermore, in each of the divided rectangular regions of equal length, nitrogen and boron atoms are replaced with carbon atoms, with the number of nitrogen and boron atoms being the same as the preferred replacement.

[0010] Furthermore, the atomic ratio is defined as the ratio of a specific atom within a single region to all atoms within that region.

[0011] Furthermore, by replacing different numbers of carbon atoms in the same area, h-BCNs with different carbon atom ratios can be obtained.

[0012] Furthermore, graphene two-dimensional material was selected as the friction component, placed on h-BCN, and slid along the direction of the armchair.

[0013] Furthermore, the sliding speed of the friction components is 0.1-100m / s.

[0014] Furthermore, the positive pressure range of the friction component in contact with h-BCN is selected to be 0.001 to 0.4 nN / atom.

[0015] Furthermore, h-BCN with different atomic ratios was grown on the substrate surface using chemical vapor deposition, with the substrate selected from copper and copper-nickel alloy substrates.

[0016] The beneficial effects of this invention are: 1. By replacing different numbers of nitrogen and boron atoms, h-BCN with different atomic ratios was obtained. The friction of h-BCN gradually decreased as the carbon atom ratio increased, reaching a minimum value when the carbon atom ratio was 0.4, and then gradually increased, exhibiting a non-monotonic frictional change.

[0017] 2. By using the method of the present invention to adjust the frictional force, the friction of two-dimensional materials can be flexibly controlled. Attached Figure Description

[0018] Figure 1 This is a model diagram of h-BCN with a carbon atom ratio of 0.4 in this invention; Figure 2The friction force curves of h-BCN with different carbon atom ratios in this invention are shown. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] In the description of the embodiments of the present invention, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first," "second," and "third" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] Furthermore, the use of terms such as "horizontal," "vertical," and "sag" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0022] In the description of the embodiments of the present invention, "multiple" means at least two.

[0023] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0024] Example:

[0025] A method for controlling the friction coefficient of two-dimensional materials by atomic ratio: Boron nitride and graphene were selected as the two-dimensional materials to be regulated. The nitrogen and boron atoms in boron nitride were replaced with carbon atoms in different proportions to form the h-BCN. The length and width of the material were selected as 100 nm. The material is divided into 100 equal rectangular regions along the direction of the armchair. In each of the divided equal rectangular regions, nitrogen and boron atoms are replaced with carbon atoms, and the number of nitrogen and boron atoms replaced is kept consistent. The ratio of a specific atom in a single region to all atoms in that region is called the atomic ratio. By replacing different numbers of carbon atoms in regions of the same size, we can obtain h-BCNs with different carbon atom ratios. Graphene is selected as the friction component and placed on h-BCN. The sliding speed of the friction component is 10 m / s, and the normal force in contact with h-BCN is in the range of 0.001 to 0.1 nN / atom. By sliding along the direction of the armchair, the friction force of h-BCN with different carbon atom ratios can be obtained.

[0026] This embodiment shows, through molecular dynamics simulation, that the friction of h-BCN gradually decreases with increasing carbon atom ratio, reaching a minimum at a carbon atom ratio of 0.4, and then gradually increases again, exhibiting a non-monotonic frictional change.

[0027] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A method for controlling the friction coefficient of two-dimensional materials by changing the atomic ratio, characterized in that: Boron nitride and graphene were selected as the two-dimensional materials to be controlled. Nitrogen and boron atoms in boron nitride were replaced with carbon atoms in different proportions to form h-BCN. The length and width of the material were chosen to be 100 nm. The material was divided into 100 equally long rectangular regions along the armrest direction. In each of these regions, nitrogen and boron atoms were randomly replaced with carbon atoms, ensuring that the number of replaced nitrogen and boron atoms was consistent. The ratio of a specific atom in a single region to all atoms in that region is the atomic ratio. By using different numbers of carbon atoms to replace boron and nitrogen atoms in hexagonal boron nitride in regions of the same size, h-BCN with different carbon atom ratios were obtained. Graphene was selected as the friction component and placed on the h-BCN. The sliding speed of the friction component was 10 m / s, and the normal pressure in contact with the h-BCN ranged from 0.001 to 0.1 nN / atom. By sliding along the armrest direction, the friction force of h-BCN with different carbon atom ratios could be obtained. The friction of h-BCN gradually decreases with increasing carbon atom ratio, reaching a minimum at a carbon atom ratio of 0.4, and then gradually increases again, exhibiting a nonlinear and non-monotonic frictional change.

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