Surface photocurrent gas sensor with properties dependent on Ru(dcbpy)2(NCS)2-sensitized ZnO nanoparticles
Surface photocurrent gas sensor with properties dependent on Ru(dcbpy)2(NCS)2-sensitized ZnO nanoparticles
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DOI：
10.1016/j.snb.2005.11.014
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发表时间：
2006-09-12
影响因子：
8.4
通讯作者：
Wei, Xiao
中科院分区：
文献类型：
--
作者：
Yang, Min;Wang, Dejun;Wei, Xiao
以Ru（dcbpy）（2）（NCS）（2）（dcbpy = 2，2 '-bipyridine-4，4'-dicarboxylate）（RuN 3）敏化的ZnO为碳源，在可见光（545 nm）激发下，采用表面光电流技术，在梳状电极上制备了一种新颖的光电气敏元件，并在室温下对CO和O-2进行了检测.样品的表面光电流（I-SPC）可以根据气体的性质而显著增强和减小。CO作为还原性气体，可使I-SPC增加，传感器响应与CO浓度的变化呈线性关系，检测限为0.62Torr。然而，I-SPC减少O-2吸附，因为它可以从表面捕获电子。I-SPC与O-2浓度无线性关系。本文还对光电气敏元件的微观机理进行了详细的讨论。该研究对ZnO气敏元件的实际应用具有一定的参考价值。(c)2005 Elsevier B. V.保留所有权利。
An original photoelectric gas sensor, fabricated by Ru(dcbpy)(2)(NCS)(2) (dcbpy = 2,2'-bipyridyl-4,4'-dicarboxylate)(RuN3)-sensitized ZnO on a comb-like electrode by surface photocurrent technique with excitation of visible light (545 nm), is presented for CO and O-2 detection at room temperature. The surface photocurrent (I-SPC) of a sample can be dramatically enhanced and diminished depending on the properties of the gases. As a reductive gas, CO can make I-SPC increase and the sensor response is linear to the change in CO concentration with a detection limit of 0.62 Torr. However, I-SPC decreases upon O-2 adsorption, since it can capture electrons from the surface. There is no linear dependency between I-SPC and concentration of O-2. In this article a microscopic mechanism of the photoelectric gas sensor has also been discussed in detail. This research should be valuable for the practical application of the ZnO gas sensor. (c) 2005 Elsevier B.V. All rights reserved.