He Qiong, Xu Xiangdong, Wang Meng, Sun Minghui, Jiang Yadong, Yao Jie, Ao Tianhong
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, P. R. China.
Phys Chem Chem Phys. 2016 Jan 21;18(3):1422-8. doi: 10.1039/c5cp03600c. Epub 2015 Oct 12.
A series of vanadium oxide (VOx)-single-walled carbon nanotube (SWCNT) composite films with different SWCNT concentrations were prepared and systematically investigated. The results reveal that after SWCNT addition, the optical absorption and electrical conductivity of VOx are enhanced, but the crystallinity and temperature coefficient of resistance (TCR) are weakened. Consequently, either too low or too high CNT loading will lead to the degradation of the comprehensive properties. In contrast, the VOx-SWCNT composite film containing 4 wt% SWCNTs exhibits the optimal comprehensive properties such as high film uniformity, large optical absorption, and desirable sheet resistance (141 kΩ) and TCR (-1.73% K(-1)), favorable for applications in uncooled infrared detectors. Saturated interactions between SWCNTs and VOx are observed at 6 wt% SWCNTs, after which (≤10 wt% SWCNTs) the structures and properties are changed slightly. This work reveals the modification of the chemical structures and physical properties of VOx films by SWCNTs, whose results will be helpful not only for a better understanding of VOx, SWCNTs, and their composites, but also for seeking new versatile functional materials for device applications.
制备了一系列具有不同单壁碳纳米管（SWCNT）浓度的氧化钒（VOx）-单壁碳纳米管复合薄膜，并进行了系统研究。结果表明，添加SWCNT后，VOx的光吸收和电导率增强，但其结晶度和电阻温度系数（TCR）减弱。因此，碳纳米管负载量过低或过高都会导致综合性能下降。相比之下，含有4 wt% SWCNT的VOx-SWCNT复合薄膜表现出最佳的综合性能，如高薄膜均匀性、大光吸收、理想的方块电阻（141 kΩ）和TCR（-1.73% K(-1)），有利于应用于非制冷红外探测器。在SWCNT含量为6 wt%时观察到SWCNT与VOx之间的饱和相互作用，此后（≤10 wt% SWCNT）结构和性能略有变化。这项工作揭示了SWCNT对VOx薄膜化学结构和物理性能的改性，其结果不仅有助于更好地理解VOx、SWCNT及其复合材料，还有助于寻找用于器件应用的新型多功能功能材料。
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