Enhanced response to NO2 with CuO/ZnO laminated heterostructured configuration
Enhanced response to NO2 with CuO/ZnO laminated heterostructured configuration
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CuO/ZnO 层状异质结构增强对 NO2 的响应
DOI：
10.1016/j.snb.2014.01.030
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发表时间：
2014-05-01
影响因子：
8.4
通讯作者：
Zhang, Shunping
中科院分区：
文献类型：
--
作者：
Yang, Li;Xie, Changsheng;Zhang, Shunping
在气敏传感器领域中，电荷分离行为是一个容易被忽视的问题。在这项工作中，一个新的视角集中在电荷分离理论的气体传感机制的探索。为了实现这一目标，我们引入了新型的层状CuO/ZnO p-n异质结构系统来实现这一尝试。所需的系统由平行的Au电极、CuO和ZnO功能层组成。值得注意的是，叠层异质结构和外电场的协同作用可以加强CuO和ZnO层中的单向电荷分离。在350 ℃时，[电极/CuO/ZnO]异质结构的最佳响应比普通CuO提高了3.58倍。有趣的是，我们观察到的电阻显着变化，一旦切断NO2气体，其详细的形成机制进行了讨论。我们认为，从双电子到单电子的转变过程是导致异常结果的原因。该气敏机理的分析方法对利用叠层异质结构设计高性能的气敏元件具有一定的指导意义。(C)2014爱思唯尔有限公司版权所有。
The charge separation behavior is easily ignored in the field of gas sensor. In this work, a novel perspective focuses on the charge separation theory for the exploration of the gas sensing mechanism. For this target, the novel laminated CuO/ZnO p-n heterostructured systems are introduced to achieve this attempt. The desired system is composed of the parallel Au electrodes, CuO and ZnO functional layers. It is worth noting that the synergistic effect of the laminated heterostructure and external electric field can strengthen the unidirectional charge separation in both CuO and ZnO layers. Comparing with the plain CuO, the optimal response is enhanced 3.58 times by utilizing the [electrode/CuO/ZnO] heterostructured configuration at 350 degrees C. Interestingly, we observe that the resistance changed remarkably once the NO2 gas is cut off, and its detailed formation mechanism is discussed. We believe that the transformation process from double electrons to single electron is responsible for the abnormal results. The analysis method for gas sensing mechanism has a certain guiding significant for the design of gas sensor with high performance by using the laminated heterostructured configuration. (C) 2014 Elsevier B.V. All rights reserved.