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Continuously adjusting infrared emissivity of multilayer graphene using pulse voltage

Authors :
Junxiao Li
Wenlian Peng
Huang Huang
Haibo Ke
Zhe Liu
Ruoyu Huang
Xiaoxiao Guo
Shujian Cheng
Yufeng Zhang
Mengyan Dai
Xue-ao Zhang
Source :
Applied Physics Letters. 121:042204
Publication Year :
2022
Publisher :
AIP Publishing, 2022.

Abstract

Steadily, continuously, and precisely adjusting infrared emissivity of materials is of great importance for various applications, such as thermal camouflage. Herein, a method is proposed to fine-tune the emissivity of multilayer graphene (MLG) by ion intercalation with assistance of pulse voltage. The dynamic ion intercalation process in MLG-based emissivity modulators is investigated by a home-made electrical-optical synchronizing test system, which consists of a potentiostat and a thermal camera. It is observed that the apparent temperature of MLG is closely correlated with pulse duration and residual charges. Based on a second-order RC model, the ion transportation and charge transfer in the modulator are likely affected by three factors (i.e., internal resistance, electric field, and concentration gradient), which changes the doping level of MLG. Hence, the emissivity of MLG can be finely adjusted by regulating the duration of the voltage pulse. This also leads to a wavelength dependence of emissivity modulation, which is confirmed by Fourier transform infrared spectroscopy. The observations offer a promising venue for precise and continuous adjustment of MLG's emissivity, which is of great significance for many practical applications, such as simulating complex and subtle thermal images.

Details

ISSN :
10773118 and 00036951
Volume :
121
Database :
OpenAIRE
Journal :
Applied Physics Letters
Accession number :
edsair.doi...........e1d4a20371311e77b58b8a49187c7e20
Full Text :
https://doi.org/10.1063/5.0100282