Hydrogen-selective sensing at room temperature with ZnO nanorods

被引:503
作者
Wang, HT
Kang, BS
Ren, F
Tien, LC
Sadik, PW
Norton, DP
Pearton, SJ [1 ]
Lin, J
机构
[1] Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA
[2] Univ Florida, Dept Chem Engn, Gainesville, FL 32611 USA
[3] Univ Florida, Dept Elect & Comp Engn, Gainesville, FL 32611 USA
基金
美国国家科学基金会;
关键词
D O I
10.1063/1.1949707
中图分类号
O59 [应用物理学];
学科分类号
摘要
The sensitivity for detecting hydrogen with multiple ZnO nanorods is found to be greatly enhanced by sputter-depositing clusters of Pd on the surface. The resulting structures show a change in room- temperature resistance upon exposure to hydrogen concentrations in N-2 of 10-500 ppm of approximately a factor of 5 larger than without Pd. Pd-coated ZnO nanorods detected hydrogen down to < 10 ppm, with relative responses of > 2.6% at 10 ppm and > 4.2% at 500 ppm H-2 in N-2 after a 10 min exposure. There was no response at room temperature to O-2. Approximately 95% of the initial ZnO conductance after exposure to hydrogen was recovered within 20 s by exposing the nanorods to either air or pure O-2. This rapid and easy recoverability make the Pd-coated nanorods suitable for practical applications in hydrogen-selective sensing at ppm levels at room temperature with < 0.4 mW power consumption. (c) 2005 American Institute of Physics.
引用
收藏
页码:1 / 3
页数:3
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