Cai Zhi, Himel Mehedi Hasan, Li Ruoxi, Aravind Indu, Weng Sizhe, Zhang Boxin, Cronin Stephen B
Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089, United States.
Ming Hsieh Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, United States.
ACS Omega. 2024 Dec 23;10(1):1077-1081. doi: 10.1021/acsomega.4c08468. eCollection 2025 Jan 14.
We report a new approach for fabricating gate-tunable thermal emissivity surfaces by spraying them on graphene ink. The devices consist of a multilayer graphene (MLG)/porous alumina membrane/gold stack, in which the MLG is deposited by spraying the graphene ink onto the porous membrane using an airbrush. The graphene ink consists of μm-sized flakes of MLG suspended in a solution of polyvinylpyrrolidone and ethylene glycol. The alumina porous membrane is filled with the ionic liquid [DEME][TFSI], forming an electrochemical cell. When a positive voltage is applied to the device, the intercalation of [TFSI] anions causes large changes in the thermal emissivity of the MLG. This, in turn, gives rise to a substantial change in the apparent temperature (i.e., thermal camouflage) as measured by a thermal imaging (i.e., FLIR) camera sensitive over the 7.5-14 μm wavelength range. In this work, the apparent temperature change reaches Δ = 14 °C. This method of spray coating offers a scalable solution that is compatible with roll-to-roll printing and manufacturing techniques.
我们报道了一种通过在石墨烯油墨上进行喷涂来制造栅极可调热发射率表面的新方法。这些器件由多层石墨烯（MLG）/多孔氧化铝膜/金堆叠组成，其中MLG是通过用喷枪将石墨烯油墨喷涂到多孔膜上沉积而成的。石墨烯油墨由悬浮在聚乙烯吡咯烷酮和乙二醇溶液中的微米级MLG薄片组成。氧化铝多孔膜填充有离子液体[DEME][TFSI]，形成一个电化学电池。当向器件施加正电压时，[TFSI]阴离子的嵌入会导致MLG的热发射率发生很大变化。这反过来又会导致在7.5 - 14μm波长范围内敏感的热成像（即FLIR）相机测量的表观温度（即热伪装）发生显著变化。在这项工作中，表观温度变化达到Δ = 14°C。这种喷涂方法提供了一种可扩展的解决方案，该方案与卷对卷印刷和制造技术兼容。
