A kind of light absorber and preparation method thereof

Abstract

The invention discloses a light absorber and a preparation method thereof. The preparation method comprises: S1. using aramid fiber as a raw material to prepare an aramid fiber nanofiber solution; S2. preparing a metal nanoparticle solution; S3. making the aramid fiber prepared in step S1 The aramid nanofiber solution and the metal nanoparticle solution prepared in step S2 are mixed to prepare a mixed solution; S4. the mixed solution prepared in step S3 is removed from the solvent to obtain a nanocomposite film light absorber; the light absorber is based on aramid fiber nanofiber , metal nanoparticles loaded on the aramid nanofiber matrix. The optical absorber is ultra-flexible, has sufficient and durable mechanical strength, and is conducive to a wide range of applications in wearable and non-planar photothermal devices; it can realize high-efficiency, full-angle, and broadband light in visible and near-infrared frequencies. absorption; the preparation method is simple and efficient, and easy to scale.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a light absorber and a preparation method thereof. Background technique [0002] An ideal light absorber with high absorption efficiency in all directions (all angles) has always been the main goal of science and technology. In recent years, optical absorbers based on metamaterials (such as plasmonic optical absorbers) have been extensively researched and developed in many fields. Metamaterials are artificial structural materials composed of arrays of subwavelength cells with excellent electromagnetic properties. Metamaterial absorbing materials can generally be divided into narrowband absorbing materials and broadband absorbing materials. Narrowband metamaterial absorbers always rely on the resonance effects of structures that interact with light of a specific frequency. In contrast, broadband metamaterial absorbers rely on structures whose electromagnetic response...

AI Technical Summary

Problems solved by technology

This makes these devices inflexible and largely limits their application in wearable and other optoelectronic systems with non-planar surfaces.

Although some experimental attempts have been made at terahertz and optical frequencies, and the preparation of metamaterials on flexible substrates has been successfully realized, the strength and strain of periodic metamaterial structures are not as good as flexible substrates, which reduces the performance of devices. overall mechanical properties

Therefore, it remains challenging to fabricate flexible films with high performance, omni-angle, and broadband light absorption using large-area, high-throughput bottom-up techniques.

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