Preparation method of chitin nanofiber antireflection coating, antireflection coating and substrate

Abstract

The invention provides a chitin nanofiber anti-reflection coating preparation method, an anti-reflection coating and a substrate, the chitin nanofiber anti-reflection coating preparation method comprises the following steps: firstly preparing a chitin nanofiber water suspension, putting the substrate into a container filled with the chitin nanofiber water suspension, putting the container between a positive electrode and a negative electrode, applying a direct current electric field in a direction perpendicular to a to-be-coated surface of the substrate, the surface of the substrate is coated with the chitin nanofibers, the strength is 0.56-5.59 * 10 < 3 > V / m, the chitin nanofibers with charges on the surfaces move towards the to-be-coated surface of the substrate and are deposited on the to-be-coated surface of the substrate, and the substrate with the chitin nanofiber anti-reflection coating is obtained.According to the method, the anti-reflection coating can be constructed on the surface of the substrate within 10-20 min; the light transmittance gain of the antireflection coating within the wavelength range of 400-800 nm can reach 5%, and the antireflection coating can be applied to plastic and biological material substrates.

Description

technical field [0001] The invention belongs to the technical field of anti-reflection coatings, in particular to a preparation method of a chitin nanofiber anti-reflection coating. Background technique [0002] Anti-reflection coating plays an extremely important role in optical components, light-emitting devices, flat panel and flexible displays, photovoltaic devices, optical biosensors, etc. It can increase the luminous flux and sensitivity of the optical system, improve the performance and efficiency of light-emitting devices, and improve display performance The display effect under sunlight suppresses the glare effect, improves the photoelectric conversion efficiency of photovoltaic devices, and the like. In many applications, every percent loss of luminous flux can cause a significant decrease in device performance or functionality. [0003] The anti-reflection coatings currently developed mainly include graded refractive index coatings, multi-layer interference coati...

AI Technical Summary

Problems solved by technology

The "top-down" strategy uses imprint lithography, colloid etching, plasma etching and other methods to prepare nanocone or convex hull arrays with precise shapes on the substrate surface, but most of them require expensive equipment or complicated processes. , high cost and time-consuming

Although a variety of methods for preparing anti-reflection surfaces or coatings have been developed, the following problems still exist: the first is that the production cost of most preparation methods has a large gap with the acceptable price in the market, and the low-cost and large-area (more than 1 square meter) ) The preparation of anti-reflection surface or coating is still a challenge at present; the second is that the nanomastoid arrays prepared on the substrate surface are usually fragile, easily damaged or polluted, resulting in a decline in anti-reflection performance, which limits its wide application; the third is Using sol-gel methods to construct anti-reflection coatings on glass surfaces requires high-temperature treatment. This type of method is not suitable for polymer material substrates with a glass transition temperature lower than 200 ° C. It should be prepared at the lowest possible temperature. Anti-reflection coatings remain a great challenge

For example, the coating with anti-reflection function can be prepared by alternately dipping the water dispersion of chitin nanofibers and polyacrylic acid solution on the glass surface, but this method is cumbersome and time-consuming, and the polyacrylic acid adhesive fills the coating. Partial voids between chitin nanofibers in the layer are not conducive to further reduction of the refractive index of the coating

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