CN117004920A

CN117004920A - Gradient h-BNC nano self-cleaning film design method

Info

Publication number: CN117004920A
Application number: CN202310944547.6A
Authority: CN
Inventors: 应天泉; 张田忠; 陆蕾玲
Original assignee: University of Shanghai for Science and Technology
Current assignee: University of Shanghai for Science and Technology
Priority date: 2023-07-28
Filing date: 2023-07-28
Publication date: 2023-11-07

Abstract

The invention discloses a design method of a gradient h-BNC nano self-cleaning film, which is characterized in that the density of carbon atoms is gradually reduced and the densities of boron atoms and nitrogen atoms are gradually increased along the central to edge area of the film to form the gradient h-BNC nano self-cleaning film. The invention has the advantages that: by adopting atomic density change of boron, carbon and nitrogen atoms, the gradient h-BNC nano film is designed, and has excellent dustproof and self-cleaning capabilities. The gradient h-BNC nano self-cleaning film can greatly reduce the pollution on the surface of a nano device, thereby maintaining the performance of the device.

Description

Gradient h-BNC nano self-cleaning film design method

Technical Field

The invention relates to the field of nanoparticle cleaning, in particular to a gradient h-BNC nanometer self-cleaning film design method.

Background

The development of transportation, energy harvesting and sensory response relies on effective surface cleaning techniques to address dust accumulation. Removal of surface contaminants is readily accomplished on a macroscopic scale, but becomes more challenging as electromechanical devices shrink to nanometer scale. Conventional cleaning methods (e.g., wiping the surface with a cloth) are not suitable for nano-devices because they are difficult to remove nano-particles and may damage device components.

In order to achieve a contamination free surface of the nano-device, one reliable approach is to use external drives such as thermal annealing, mechanical cleaning and plasma treatment, which require a continuous external energy supply, which is less sustainable for long term deployment. In contrast, encapsulation of devices, such as graphene, hexagonal boron nitride (h-BN), and polymers, using two-dimensional materials may protect the surfaces of the nano-devices from contamination without external intervention. However, only current encapsulation materials are concerned with surface protection only and do not address the reduced device performance issue associated with nanoparticle deposition. Recently, in-plane graphene/h-BN heterostructures (h-BNCs) have been successfully prepared by various methods, and their potential applications have attracted widespread attention due to the adjustability of the ternary atomic ratio. It is not known whether the characteristic of adjustable h-BNC atomic ratio can be utilized in the field of dust prevention and self-cleaning.

Disclosure of Invention

In order to solve the existing problems, the invention provides a gradient h-BNC nanometer self-cleaning film design method.

A gradient h-BNC nano self-cleaning film design method is characterized in that the density of carbon atoms is gradually reduced along the direction from the center to the edge, and the densities of boron atoms and nitrogen atoms are gradually increased from the center area to the edge area, so that the h-BNC nano self-cleaning film with the atomic ratio gradient is formed.

Preferably, the diameter or length of the film is 40-100nm.

Preferably, the film is divided into 80-100 annular regions of equal annular width or rectangular regions of equal length.

Preferably, the carbon atom density, the boron atom density, and the nitrogen atom density all vary linearly from the center region to the edge region in the radial direction.

Preferably, the center region has a carbon atom density of 1.0 and the edge regions each have a boron atom and nitrogen atom density of 0.5.

Preferably, the film is produced in the laboratory using CVD techniques.

The invention has the advantages that: by adopting atomic density change of boron, carbon and nitrogen atoms, the gradient h-BNC nano film is designed, and has excellent dustproof and self-cleaning capabilities. The gradient h-BNC nano self-cleaning film can greatly reduce the pollution on the surface of a nano device, thereby maintaining the performance of the device.

Drawings

FIG. 1 is a block diagram of a gradient h-BNC nano self-cleaning film of the invention;

1, a central area; 2. an edge region;

fig. 2 is a conceptual diagram of a film application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

In the description of the embodiments of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate an azimuth or a positional relationship based on that shown in the drawings, or an azimuth or a positional relationship in which the product of the present invention is conventionally put when used, it is merely for convenience of describing the present invention and simplifying the description, and it does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," "overhang" and the like, if any, do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present invention, "plurality" means at least 2.

In the description of the embodiments of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

Examples: the design method of the gradient h-BNC nanometer self-cleaning film comprises the following steps:

along the direction from the center to the edge, the density of the carbon atoms 1 is reduced from the center area to the edge area, and the densities of the boron atoms 2 and the nitrogen atoms 3 are increased from the center area to the edge area, so that the gradient h-BNC nano film is formed. The diameter or length of the film is 40-100nm, and the film is divided into 80-100 annular areas with equal ring width or rectangular areas with equal length. The carbon atom density, the boron atom density and the nitrogen atom density all linearly vary from the center region, which has a carbon atom density of 1.0, to the edge region, which has a boron atom and nitrogen atom density of 0.5, respectively, along the radial direction.

The films may be produced in the laboratory using CVD techniques.

The working principle of the invention is as follows:

the binding energy of the boron atom and the nitrogen atom is larger than that of the carbon atom and the nano-particle, so that the nano-particle has a poor binding energy from the center to the edge on the gradient h-BNC nano-film; at the nanoscale, the binding energy difference produces a gradient force on the nanoparticle from center to edge, the magnitude of which is positively correlated to the film diameter or length, driving the nanoparticle from center to edge.

The gradient h-BNC nano film can not only remove nano solid particles, but also remove nano liquid drops, and has excellent removing capability; the method can reduce the influence on the device performance of the nano photoelectric device and the nano flexible device, and has wide application range.

The invention and its embodiments have been described above with no limitation, and the actual construction is not limited to the embodiments of the invention as shown in the drawings. In summary, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical solution should not be creatively devised without departing from the gist of the present invention.

Claims

1. A gradient h-BNC nanometer self-cleaning film design method is characterized in that: along the direction from the center to the edge of the film, the density of carbon atoms is reduced, and the densities of boron atoms and nitrogen atoms are increased, so that the h-BNC gradient nano film is formed.

2. The gradient h-BNC nano self-cleaning film design method according to claim 1, which is characterized in that: the diameter or length of the film is 40-100nm.

3. The gradient h-BNC nano self-cleaning film design method according to claim 1, which is characterized in that: the film is divided into 80-100 annular areas with equal annular widths or rectangular areas with equal annular widths.

4. The gradient h-BNC nano self-cleaning film design method according to claim 1, which is characterized in that: the carbon atom density, the boron atom density, and the nitrogen atom density all vary linearly from the center region to the edge region in the radial direction.

5. The gradient h-BNC nano self-cleaning film design method according to claim 1, which is characterized in that: the center region carbon atom density was 1.0, and the edge region boron atom and nitrogen atom densities were 0.5 each.

6. The gradient h-BNC nano self-cleaning film design method according to claim 1, which is characterized in that: the round thin film was produced in the laboratory using CVD techniques.