可用于红外隐身的纳米石墨薄膜热辐射调制器的研究

Study on Thermal Radiation Modulator of Nano Graphite Film for Infrared Stealth

碳材料以重量轻、比表面积大、机械强度高、导电性好等特性在隐身技术领域有巨大的应用潜力。本文基于化学气相沉积方法,通过优化生长温度、降温速率和氢气流量制备出厚度为500~700nm、表面褶皱且具有高结晶度的石墨薄膜。进一步通过构建夹层结构的中红外热辐射调制器,研究了离子插入对纳米石墨薄膜红外热辐射性能的影响,发现在0~4V电压调控范围,通过电控制离子液体插入,石墨薄膜的红外发射率可以从0.38降低到0.06,且红外发射率调谐性能可逆。这种纳米石墨薄膜可以作为一种新型的智能热表面材料,用于复杂背景下的动态热伪装或红外隐身,同时其发射率可动态调谐的性能使其在辐射冷却、个人热管理和红外通信等方面也有巨大的潜在应用价值。

Carbon materials have great application potential in the field of stealth technology because of their light weight,large surface area,high mechanical strength and electrical conductivity.In this paper,based on Chemical Vapor Deposition(CVD)method,graphite films with thickness of 500~700nm,wrinkled surface and high crystallinity were prepared by optimizing the growth temperature,cooling rate and hydrogen flow rate.By constructing a mid-infrared radiation modulator with sandwich structure,the effect of ion insertion on the infrared radiation performance of nano graphite film was studied.It was found that the infrared emissivity of graphite films could be reduced from 0.38 to 0.06 by electrically controlled ion liquid insertion in the voltage range of 0~4V,and the infrared emissivity modulation property could be reversible or repeatable.This kind of graphite film can be used as a new intelligent thermal surface material for dynamic thermal camouflage in complex backgrounds,and its emissivity dynamic tuning property also has great potential applications in radiation cooling,personal thermal management and infrared communication.