期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 176, 期 -, 页码 360-367出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2012.09.081
关键词
Nanorod arrays; Hydrogen gas sensor; Room temperature; ZnO; Oblique nanorods; Vertical nanorods
资金
- ERGS
- PRGS [1001/PFIZIK/844070]
- Universiti Sains Malaysia
The high surface area to volume ratio, the networks connections of vertically and oblique nanorod arrays, and the absence of seed layer, were the key factors responsible for the high sensitivity of ZnO nanorod arrays based hydrogen sensor at room temperature. Arrays of vertical and oblique zinc oxide nanorods were grown on a c-plane sapphire substrate by microwave-assisted chemical bath deposition. Polyvinyl alcohol (PVA)-Zn(OH)(2) nanocomposites were used as a novel seed material to seed the sapphire substrate prior to the growth of the ZnO nanorods. The hydrogen sensing capabilities of the ZnO nanorod arrays, without the use of a metal catalyst, were investigated at room temperature. The rods exhibited excellent sensitivity, of 500%, in the presence of 1000 ppm of H-2 while consuming an ultralow level of power (<10 mu W). The sensing measurements for hydrogen gas at various temperatures (25-250 degrees C) were repeatable over a period of 100 min. The sensor exhibited a sensitivity of 4000% at 250 degrees C upon exposure to 1000 ppm of H-2 gas. Hysteresis was noticed in the sensor for different concentrations of H-2 at different temperatures. It can be surmised that this hydrogen gas sensor has potential for use as a portable room-temperature gas sensor. (C) 2012 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据