Method for preparing ion barrier film of low-light image intensifier

Abstract

The invention provides a method for preparing an ion barrier film of a low-light image intensifier. The method comprises the steps of (a) preparing a micro-channel plate, (b) preparing a graphene filmof a single-atom layer and a single crystal on a substrate independent of the micro-channel plate in each time, (c) removing a substrate, (d) cleaning the graphene film, (e) transferring the graphenefilm to an end face of the micro-channel plate and transferring a single-atom layer grapheme film in each time form an ion barrier feedback film, (f) drying, and (g) stacking. According to the thickness requirement of the ion barrier film, the transfer step is repeated, the precise control of the thickness of the ion barrier film is achieved, and the precision of the control is in the level of the thickness of the single-atom layer. According to the method, an organic film for assistance is not needed, the pollution of the micro-channel plate by the preparation and removal process of the organic film is avoided, the single-atom layer grapheme film is transferred to the end face of the micro-channel plate in each time, grapheme films can be transferred for many times and stacked, and the thickness of the ion barrier film can be accurately controlled. The preparation of the ion barrier film and the preparation of the micro-channel plate are independent of each other and do not affect each other, the electron transmission performance of the ion barrier film is well matched to the barrier performance for other ions, at the same time, the process repeatability is good, and the productconsistency is high.

Description

technical field [0001] The invention belongs to the technical field of photoelectric devices, and in particular relates to a preparation method of an anti-ion feedback film of a low-light image intensifier. Background technique [0002] The low-light image intensifier is the core device of the low-light night vision device and plays a decisive role in the imaging quality of the entire system. The low-light image intensifier is a vacuum device, which is mainly composed of the following parts: photocathode, anti-ion feedback film, micro-channel plate and fluorescent screen. Such as figure 1 As shown, the microchannel plate is a photomultiplier tube array with a large area array, high electron multiplication, and high spatial resolution, and has a thin-sheet honeycomb structure. There is a microhole array on the microchannel plate, and the hole diameter is on the order of microns, which can multiply the electron density distributed in two-dimensional space. Due to the residu...

AI Technical Summary

Problems solved by technology

[0005] 1. In the process of removing the organic support membrane at high temperature, the decomposition of organic matter will cause the problem of microchannel pollution, which will affect the life of the microchannel plate, and the step of removing other support membranes on the microchannel plate will increase the difficulty of process operation

[0006] 2. Since the preparation process is a sequential preparation process of microchannel plate, organic membrane, and anti-ion feedback membrane, the microchannel plate cannot be used again when the membrane fails, which reduces the yield and increases the production cost

[0007] 3. The traditional method of using graphene film as an anti-ion feedback film can only prepare a layer of single atomic layer graphene film as an anti-ion feedback film

Images