Preparation method of a light-modulating terahertz absorbing device with an all-carbon structure

Abstract

The invention discloses a method for preparing a light-modulating terahertz absorbing device with an all-carbon structure. The method utilizes simple chemical assembly and reduction, and molecular crystal-assisted transfer to obtain independently supported graphene nanomaterials. The sintering temperature and time are regulated to obtain Defect-controllable graphene film structure. The film has good terahertz permeability or shielding property. The thin film polyimides with different structures are assembled layer by layer to form a sandwich structure, and placed under terahertz light. As the concentration of molecules added to the surface increases, the peak position of the terahertz transmission spectrum will change accordingly, so it can be prepared as The terahertz molecular detection device is used to detect molecular residues; at the same time, the double-layer graphene nano-film layer can be optically regulated and can be used to detect changes in optical intensity. In addition, using the combination of the two etching methods to increase the specific surface area in different scales, under the same dropwise addition of molecular content detection, it will have a greater change in the electrical properties of the material, and the change in the terahertz signal will be greater.

Description

technical field [0001] The invention relates to a preparation method of a light modulation terahertz absorbing device with an all-carbon structure. Background technique [0002] Terahertz molecular detection uses terahertz as the basic light source to detect the influence of molecules on the conductivity of terahertz metamaterials. Its advantage is that it can detect the concentration of drug molecules quickly, in batches, and in real time. In the field of terahertz molecular detection, conventionally used materials are metals and semimetals, which have two serious problems: first, they have poor molecular affinity, especially with molecules containing conjugated structures; second, they cannot carry out optical signals. Modulation, unable to respond to changes in the external optical environment. [0003] Recently, the rapid rise of single-layer graphene provides an alternative material for terahertz molecular detection, which has good phototunability, electrical modulati...

AI Technical Summary

Problems solved by technology

In the field of terahertz molecular detection, conventionally used materials are metals and semimetals, which have two serious problems: first, they have poor molecular affinity, especially with molecules containing conjugated structures; second, they cannot carry out optical signals. Modulation, unable to respond to changes in the external optical environment

However, single-layer graphene is not easy to process and is easily damaged, resulting in a rapid decrease in conductivity and poor processing continuity. At the same time, the terahertz reflection intensity is too low, so it is not suitable for making terahertz absorbers.

Images