氧化钒-氧化石墨烯复合薄膜的制备及其光电特性

基于溶胶凝胶法，采用旋涂和喷涂相结合的工艺，制备了氧化钒（VO_x，1≤x≤2.5）-氧化石墨烯（GO）复合薄膜。利用SEM、XRD、椭偏仪、紫外可见分光光度计、FTIR及高阻仪对所制薄膜的形貌、晶相、光学及电学性能进行了系统的表征测试。结果表明，加入GO之后，VO_x-GO复合薄膜的电阻率由108.78 Ω·cm下降至68.64 Ω·cm，而薄膜的电阻温度系数（TCR）则由-1.98% K^-1提高至-2.60% K^-1。此外，VO_x-GO复合薄膜还具有更高的光吸收率和工作稳定性。说明GO的加入增强了VO_x薄膜作为非制冷红外探测器热敏材料的综合性能。本研究为探索基于VO_x的新型红外热敏材料提供了参考，同时也对非制冷红外探测器的发展有促进作用。

Preparation and optoelectronic properties of vanadium oxide-graphene oxide composite films

Vanadium oxide (VO_x, 1 ≤ x ≤ 2.5)-graphene oxide (GO) composite films were prepared by the combination of spin-coating of VO_x sol-gel and spray-coating of GO dispersion.The physical morphologies, crystallinities, optical and electrical properties of the as-prepared films were systematically characterized by SEM, XRD, ellipsometry, UV-visible spectrometer, FTIR and high resistance meter. The results indicate that the resistivity of the composite film decreases from 108.78 Ω·cm for the pristine VO_x film to 68.64 Ω·cm after GO addition, while the temperature coefficient of resistance(TCR) increases from -1.98%K^-1 to -2.60%K^-1. In addition, VO_x-GO composite film exhibits a higher light absorption. These suggest that the GO addition can significantly improve the performance of VO_x films as thermistor materials. The results present in this work not only provide valuable information for the exploration of novel VO_x-based infrared thermistor materials, but also promote the development of uncooled infrared detectors.