由几纳米厚的ZnS薄层修饰的ZnO纳米棒的硫化氢气体传感性能得到改善。

Improved H2S gas sensing properties of ZnO nanorods decorated by a several nm ZnS thin layer.

作者信息

Qi Gaocan, Zhang Li, Yuan Zhihao

机构信息

School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China.

出版信息

Phys Chem Chem Phys. 2014 Jul 14;16(26):13434-9. doi: 10.1039/c4cp00906a.

DOI:10.1039/c4cp00906a

PMID:24887567

Abstract

To avoid a spontaneous reaction between ZnO gas sensing materials and detected H2S gas, ZnO nanorods decorated with a several nm ZnS thin layer were designed. The ZnS-decorated layer was prepared by passivating oriented ZnO nanorods in a H2S atmosphere. The effect of the passivation processes on the H2S sensing properties was investigated. It was found that ZnO nanorods decorated with a 2 nm-thick ZnS layer possessed a repeatable and superior response to ppm-level H2S at room temperature. Moreover, a confinement effect was proposed to explain the improved sensing properties of the decorated ZnO nanorods.

摘要

为避免ZnO气敏材料与被检测的H2S气体之间发生自发反应，设计了用几纳米厚的ZnS薄层修饰的ZnO纳米棒。通过在H2S气氛中对取向的ZnO纳米棒进行钝化来制备ZnS修饰层。研究了钝化过程对H2S传感性能的影响。结果发现，用2nm厚的ZnS层修饰的ZnO纳米棒在室温下对ppm级的H2S具有可重复的优异响应。此外，还提出了一种限域效应来解释修饰后的ZnO纳米棒传感性能的改善。