Improved gas sensing performance of p-copper oxide thin film/n-TiO2 nanotubes heterostructure
Improved gas sensing performance of p-copper oxide thin film/n-TiO2 nanotubes heterostructure
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DOI：
10.1016/j.jallcom.2018.03.268
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发表时间：
2018-06-15
影响因子：
6.2
通讯作者：
Ozturk, Zafer Ziya
中科院分区：
文献类型：
--
作者：
Alev, Onur;Sennik, Erdem;Ozturk, Zafer Ziya
制备 CuO 薄膜/TiO2 纳米管异质结构来研究 p-n 异质结对传感性能的影响。 TiO2 纳米管是通过钛箔的阳极氧化合成的。然后，通过热蒸发的铜层的氧化，在纳米管上覆盖CuO薄膜。为了进行比较，还制造了仅由 CuO 薄膜和 TiO2 纳米管组成的传感器器件。通过X射线衍射（XRD）、扫描电子显微镜（SEM）和能量色散X射线（EDX）光谱对异质结构进行了表征。制造的传感器装置在不同的操作温度下暴露于 H-2、乙醇、丙酮、氯仿和 NO2 气体。实验结果表明，与TiO2纳米管和CuO薄膜相比，异质结构传感器对H-2具有更好的传感性能，工作温度低，检测限低，传感器响应高。此外，异质结构的形成不仅增加了对H-2的响应，而且显着降低了对VOC和NO2的响应。这些改进的传感性能归因于 CuO 薄膜和 TiO2 纳米管之间的异质结。 (C) 2018 Elsevier B.V. 保留所有权利。
CuO thin film/TiO2 nanotubes heterostructures were fabricated to investigate the effect of p-n heterojunction on sensing properties. TiO2 nanotubes were synthesized via anodization of Ti foil. Then, CuO thin film was covered on the nanotubes by oxidation of thermally evaporated Cu layer. For comparison, sensor devices those are composed of only CuO thin film and composed of TiO2 nanotubes have been also fabricated. The heterostructure was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX) spectroscopy. Fabricated sensor devices were exposed to H-2, ethanol, acetone, chloroform and NO2 gases at different operation temperatures. Experimental results showed that the heterostructure sensor has better performance toward H-2 in sensing with low operation temperature, low detection limit and high sensor response compared to TiO2 nanotubes and CuO thin film. Moreover, the formation of heterostructure not only increased response toward H-2 but also dramatically decreased response toward VOCs and NO2. These improved sensing properties are attributed to the heterojunction between CuO thin film and TiO2 nanotubes. (C) 2018 Elsevier B.V. All rights reserved.