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ZNO NANOROD-COATED QUARTZ CRYSTALS AS SELF-CLEANING THIOL SENSORS FOR NATURAL GAS FUEL CELLS SCIE SCOPUS

Title
ZNO NANOROD-COATED QUARTZ CRYSTALS AS SELF-CLEANING THIOL SENSORS FOR NATURAL GAS FUEL CELLS
Authors
Joo, JLee, DYoo, MJeon, S
Date Issued
2009-05-06
Publisher
ELSEVIER SCIENCE SA
Abstract
ZnO nanorods were directly grown on quartz crystals in zinc nitrate hexahydrate Solution. When exposed to hexanethiol vapor, the hexanethiol molecules adsorbed onto the nanorod-coated surface. Subsequent exposure of the adsorbed hexanethiol molecules to UV irradiation led to the photodegradation of the molecules. The adsorption and photocatalytic degradation processes were monitored by measuring changes in the resonant frequency of the crystal using a quartz crystal microbalance (QCM). The frequency change due to the adsorption of hexanethiol molecules Onto the ZnO nanorod-coated quartz crystal was similar to 10 times that observed using a quartz crystal coated with a plain ZnO film, due to the higher Surface area of the nanorods compared to the film. UV irradiation of the nanorod-coated quartz crystals on which hexanethiol was adsorbed caused the frequency to return to the value for the bare ZnO surface indicating that the hexanethiol molecules adsorbed on the ZnO surfaces were completely removed. The complete removal of hexanethiols was confirmed by X-ray photoelectron spectroscopy analysis. The results highlight the potential of ZnO nanorod-grown QCMs as self-cleaning sensors capable of long-term operation Under harsh conditions. (C) 2009 Elsevier B.V. All rights reserved.
Keywords
Thiol sensors; Self-cleaning; Natural gas fuel cells; Quartz crystal microbalance; MICROBALANCE; SURFACES; TIO2; ADSORPTION/DESORPTION; PHOTOCATALYST; DEGRADATION; FABRICATION; ELECTRODES; MONOLAYERS; CH3SH
URI
https://oasis.postech.ac.kr/handle/2014.oak/28959
DOI
10.1016/j.snb.2009.03.017
ISSN
0925-4005
Article Type
Article
Citation
SENSORS AND ACTUATORS B-CHEMICAL, vol. 138, no. 2, page. 485 - 490, 2009-05-06
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전상민JEON, SANGMIN
Dept. of Chemical Enginrg
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