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Highly sensitive and selective hydrogen sulfide and toluene sensors using Pd fuctionalized WO3 nanofibers for potential diagnosis of halitosis and lug cancer

Title
Highly sensitive and selective hydrogen sulfide and toluene sensors using Pd fuctionalized WO3 nanofibers for potential diagnosis of halitosis and lug cancer
Author
배지현
Keywords
Electrospinning; Catalyst; Exhaled breath sensor; Tungsten oxide; Palladium
Issue Date
2014-03
Publisher
Elsevier Sequoia
Citation
Sensors and Actuators B: Chemical, Vol.193[31/March/2014], pp. 574-581
Abstract
In this work, we report a remarkably improved toluene response and superior cross-sensitivity against H2S molecules by combining Pd catalysts and highly porous WO3 nanofibers (NFs). We functionalized Pd catalysts inside and/or outside of WO3 NFs synthesized by electrospinning, which is a facile and versatile process for producing webs of metal oxide NFs. Pd-embedded WO3 NFs were obtained by the electrospinning of a Pd and W composite precursor/poly(methyl methacrylate) (PMMA) solution followed by calcination at 700 °C. Pd nanoparticles (NPs) (6?10 nm) synthesized by a polyol method were decorated on the WO3 NFs (Pd-NPs/WO3 NFs) by the attachment of the Pd NPs on as-prepared WO3 NFs. The gas sensing characteristics of pure WO3, Pd-embedded WO3, Pd-NPs/WO3, and Pd-NPs/Pd-embedded WO3 NFs were tested using H2S and toluene gases in a highly humid atmosphere (RH 90%), which is similar to human exhaled breath. The results showed that the Pd-NPs/Pd-embedded WO3 NFs whose inner and outer layers were decorated by Pd catalysts, exhibited a high toluene response (Rair/Rgas = 5.5 at 1 ppm) and remarkable selectivity against H2S (Rair/Rgas = 1.36 at 1 ppm) at 350 °C, whereas pristine WO3 NFs showed superior H2S response (Rair/Rgas = 11.1 at 1 ppm) along with a negligible response toward toluene (Rair/Rgas = 1.27 at 1 ppm). The highly porous WO3 NFs decorated with Pd catalysts, exhibited potential feasibility, i.e., a low limit of detection (LOD) of 20 ppb (Rair/Rgas = 1.32) at 350 °C, for application in VOCs sensors, particularly for diagnoses of lung cancer.
URI
https://www.sciencedirect.com/science/article/pii/S0925400513014846http://hdl.handle.net/20.500.11754/48065
ISSN
0925-4005
DOI
10.1016/j.snb.2013.12.011
Appears in Collections:
COLLEGE OF HUMAN ECOLOGY[S](생활과학대학) > CLOTHING & TEXTILES(의류학과) > Articles
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