石墨烯玻璃透明薄膜加热特性

Heating Characteristics of Graphene Glass Transparent Films

石墨烯玻璃透明薄膜不仅具有石墨烯的高导热率和高电导率特性,同时表现出优异的电热转化和宽光谱高透光率特性。本文基于常压化学气相沉积技术获得了玻璃基(高纯石英JGS1)多层石墨烯薄膜,并对其电学特性、透光率以及电加热特性进行了详细的实验研究。结果表明:对于面电阻值为1500Ω∙sq^(−1),透射率为74%的石墨烯玻璃,当施加40 V外加偏压后,石墨烯薄膜可达到185℃的饱和温度,薄膜最高饱和温度达到325℃,加热速率超过18℃∙s^(−1)。与PET(Polyethylene terephthalate)基和硅基转移的石墨烯薄膜相比,直接生长石墨烯玻璃透明薄膜加热能力提高了195%,获得了更高的饱和温度、更短的热响应时间和更快的加热速率,并表现出优异的可重复性和长期稳定性,表明石墨烯玻璃在透明电加热领域中具有更加广阔的应用前景。

Graphene has become a research focus in recent years owing to its excellent characteristics,and glass is a commonly used material with high transparency and low cost.Graphene glass combines the excellent properties of both graphene and glass;graphene glass has not only high thermal conductivity,high electrical conductivity,and good surface hydrophobicity but also exhibits superior electrothermal conversion and widespectrum high-light-transmittance characteristics.Therefore,the study of graphene glass films is of theoretical value and practical significance.In this study,a high-purity glass-based(JGS1 quartz glass)multilayer graphene film was developed based on an atmospheric-pressure chemical vapor deposition(APCVD)method,and its electrical characteristics,light transmittance,and electrical heating characteristics were experimentally investigated in detail.The results show that graphene glass with different surface resistance values obtained through direct growth on a high-purity quartz glass substrate using the APCVD method,not only has excellent uniformity and quality,but also has considerably flat and high transmittance across the entire visible light region and exhibits excellent heating performance and fast response time.For graphene glass with a surface resistance of 1500Ω∙sq^(−1),the light transmittance can reach 74%,and the saturation temperature can rise to 185℃ by applying a bias voltage of 40 V.In addition,when the resistance value of the graphene glass is 420Ω∙sq^(−1),the graphene glass reaches a high saturation temperature of 325°C in 40 s,and the corresponding heating rate can exceed 18℃∙s^(−1),achieving a significantly higher heating rate than other heating films at the same voltage.Compared with the polyethylene-terephthalate-(PET-)based and silicon-based graphene films obtained by the transfer,graphene glass has a higher saturation temperature,shorter thermal response time,and faster heating rate.Furthermore,graphene glass exhibits better heating cycle stability and longer-term heating stability at a constant voltage.In addition,an experiment using the graphene glass to thermally tune the wavelength of a vertical-cavity surface-emitting laser was conducted and gave good results.The position of the laser peak controlled by the graphene glass was red-shifted by 1.78 nm by applying a voltage of 20 V,and the wavelength tuning efficiency reached 0.059 nm∙℃^(−1).Compared with PET-based and silicon-based graphene films,the actual electrical heating capacity of graphene glass increased by 195%.These experimental findings demonstrate that graphene glass transparent films with excellent electric heating characteristics can be used in various transparent electric heating fields and have relatively wide application prospects.