In this paper, CuO–CdS composites were synthesized by a facile two-step solvothermal method. The composite materials were characterized by a series of systematical measures, such as X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy and transmission electron microscopy. Through detailed experiments, it was observed that the shape of the as-prepared materials could be tailored by varying the CuO content in composites. The experimental results manifested that CdS decorated with 0.05 at% CuO presents superior performance including response/recovery speed, detection limit, optimum operating temperature, and sensitivity in comparison with pure CdS. The possible mechanisms of enhanced sensing properties were discussed in detail. At the interface of the two different material surfaces, the capacity of surface-adsorbed oxygen was elevated, which can be attributed to the formation of the p–n heterojunction between CdS and CuO. In conclusion, the functionalization of CuO with CdS may be a promising method to enhance gas-sensing properties.

中文翻译：

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CuO–CdS复合纳米线的合成及其对乙醇的超敏性能†

在本文中，通过简便的两步溶剂热法合成了CuO-CdS复合材料。通过一系列系统的手段对复合材料进行了表征，例如X射线衍射，傅立叶变换红外光谱，X射线光电子能谱，扫描电子显微镜和透射电子显微镜。通过详细的实验，观察到可以通过改变复合材料中的CuO含量来调整所制备材料的形状。实验结果表明，与纯CdS相比，装饰有0.05 at％CuO的CdS具有出色的性能，包括响应/恢复速度，检测极限，最佳操作温度和灵敏度。详细讨论了增强感测特性的可能机制。在两种不同材料表面的界面处，表面吸附的氧气的容量增加了，这可以归因于CdS和CuO之间的p–n异质结的形成。总之，用CdS对CuO进行功能化可能是增强气体传感性能的一种有前途的方法。