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Title: Resistive hydrogen sensing response of Pd-decorated ZnO "nanosponge" film
Authors: Zhao, M
Wong, MH 
Man, HC 
Ong, CW 
Keywords: H-2 sensor
ZnO film
High porosity
Fast response
UV assisted gas detection
Issue Date: 2017
Publisher: Elsevier
Source: Sensors and actuators. B, Chemical, 2017, v. 249, p. 624-631 How to cite?
Journal: Sensors and actuators. B, Chemical 
Abstract: Hydrogen (H-2)-induced resistive response of palladium (Pd)-decorated zinc oxide "nanosponge" (PdinsZnO) film was studied at different operation temperatures with and without UV illumination. The as deposited ns-ZnO film, fabricated using a supersonic cluster beam deposition system, was highly porous and composed of similar to 5 nm nanoclusters embedded in an amorphous matrix. After annealed at 500 degrees C for 1 h, the film was found to contain loosely connected 13 nm crystallites and had a porosity of 73%. The Pd/nsZnO film sensor at 20 degrees C showed a sensor response of 82 and a response time of 1 s for 2% H-2. After heated slightly to 80 degrees C, the sensor response was increased by 43 times, and the response and recovery times dropped to 0.3 s and 18 s, respectively. This performance is superior to those of many other metal oxide nanomaterials operating at temperatures > 200 degrees C. The sensing properties of the Pd/ns-ZnO film showed little degradation when UV illumination was applied, but the sensing stability was improved. A reaction model was proposed to give an explanation to the gas sensing process. The influences of increasing the operation temperature and UV illumination are discussed.
ISSN: 0925-4005
DOI: 10.1016/j.snb.2017.04.020
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