期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 174, 期 -, 页码 389-393出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2012.08.065
关键词
Zinc oxide; Indium oxide; Core-shell; Hydrogen sensors
资金
- National Science Council of Taiwan [100-2221-E-011-052-MY3]
- National Taiwan University of Science and Technology
A simple method is used to produce a new zinc oxide/indium oxide (ZnO/In2O3) core-shell nanorod (CS-NR) based hydrogen sensor. ZnO NRs are first formed using the aqueous chemical process and are covered with a shell of In2O3 nanoparticles (NPs) by a combination of sputtering (for 5, 10, 15, 20 and 30 min) and low temperature thermal oxidation (at 200 degrees C). SEM, XRD and UV-visible spectroscopy are used to analyze surface morphology, chemical composition and optical properties. The pristine ZnO NR sensors and ZnO/In2O3 CS-NR sensors are then measured for hydrogen response in concentrations from 5 to 500 ppm at room temperature. It is found that the hydrogen response for all the ZnO/In2O3 CS-NR based hydrogen sensors is almost 2 or 3 times higher than that of the pristine ZnO NRs sensors (7.6%, at 500 ppm). It is noted that the ZnO/In2O3 CS-NRs with a continuous and well-distributed In2O3 NPs (24 nm) shell layer exhibits the best response for hydrogen sensing (20.5%, at 500 ppm). (C) 2012 Elsevier B.V. All rights reserved.
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