Enhanced ethanol vapour sensing performances of copper oxide nanocrystals with mixed phases
Enhanced ethanol vapour sensing performances of copper oxide nanocrystals with mixed phases
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DOI：
10.1016/j.snb.2015.10.042
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发表时间：
2016-03-01
影响因子：
8.4
通讯作者：
Adelung, Rainer
中科院分区：
文献类型：
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作者：
Lupan, Oleg;Cretu, Vasilii;Adelung, Rainer
氧化铜纳米结构具有优异的电学、光学、热学和传感性能，在纳米尺度上具有独特的可调性和特定相的稳定性，是一种极具吸引力的纳米材料。本文报道了利用化学溶液(SCS)和两种热退火方法(快速热退火(RTA)和常规热退火(TA))制备纳米晶氧化铜薄膜。本文报道了以Cu2O、CuO以及CuO/Cu2O为混合相的Cu2O纳米结构的乙醇传感增强性能。从CuO的顶部开始到其中心区域的Cu2O的相变存在梯度。RTA对CuxOy纳米晶体气体响应的影响已被确认为在不同温度下对乙醇蒸气具有前所未有的选择性和敏感性。在300℃的最佳工作温度下，常规TA处理30min，在最佳工作温度300℃下处理30min；在275℃的较低最佳工作温度下，经525℃的RTA处理60s。观察到，掺锌可以显著地提高纯铜基传感器的响应和恢复时间，例如，分别从类似4.1%的S和10.5%的S提高到约3.3%的S和7.2%的S。对所得结果进行了详细的讨论，这为快速、灵敏、以及对痕量气体的选择性检测，这在处理公共安全和环境监测应用的技术中可能会有几个好处。(C)2015爱思唯尔B.V.保留所有权利。
Copper oxide nanostructures are fascinating nanomaterials due to their remarkable electrical, optical, thermal, and sensing properties given that their tunability and the stabilization of specific phases are uniquely possible at the nanoscale dimensions.The present study reports on nano-crystalline copper oxide thin films via a simple synthesis from chemical solutions (SCS) followed by two types of thermal annealing, namely rapid thermal annealing (RTA) and conventional thermal annealing (TA). We report on the enhanced ethanol sensing performances of the device structures based on synthesized copper oxide Cu2O with one and two distinctly different phases, namely Cu2O, CuO, as well as mixed phases CuO/Cu2O.A gradient in phase change of nano-crystals was observed for annealed samples starting from CuO on the top to Cu2O in their central region. RTA effects on the gas response of the CuxOy, nano-crystals have been identified as unprecedented selectivity and sensitivity to ethanol vapours at different temperatures. An increase in resistance value of about one order in magnitude was detected for samples treated by conventional-TA at 400 degrees C for 30 min at optimal operating temperature of 300 degrees C and RTA at 525 degrees C for 60s at lower optimal operating temperature of 275 degrees C. It has been observed that the response and recovery times for pure copper oxide-based sensors can be significantly improved by Zn-doping, e.g. from similar to 4.1 s and similar to 10.5 s to about 3.3 s and 7.2 s, respectively.The obtained results were discussed in details and it provide an exciting alternative for fast, sensitive, and selective detection of trace gases, which could be of several benefits in the technologies dealing with public securities and environmental monitoring applications. (C) 2015 Elsevier B.V. All rights reserved.