Continuously adjusting infrared emissivity of multilayer graphene using pulse voltage

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. T...

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Bibliographic Details
Published in:Applied physics letters 2022-07, Vol.121 (4)
Main Authors: Li, Junxiao, Peng, Wenlian, Huang, Huang, Ke, Haibo, Liu, Zhe, Huang, Ruoyu, Guo, Xiaoxiao, Cheng, Shujian, Zhang, Yufeng, Dai, Mengyan, Zhang, Xue-ao
Format: Article
Language:English
Subjects:
Applied physics
Charge transfer
Concentration gradient
Electric fields
Electric potential
Emissivity
Fourier transforms
Graphene
Intercalation
Modulators
Multilayers
Pulse duration
Resistance factors
Synchronism
Voltage
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Summary: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0100282