Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 223, Issue -, Pages 301-310Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.09.095
Keywords
Layer-by-layer self assembly; WO3 nanotube; Catalyst; Exhaled breath sensor
Funding
- Korea Institute of Machinery & Materials (KIMM)
- National Research Council of Science & Technology (NST)
- center for Integrated Smart Sensors - Ministry of Science, ICT and Future Planning as a Global Frontier Project [CISS-2011-0031870]
- National Research Foundation of Korea [2011-0031870, 2016H1A2A1907718] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this work, highly porous WO3 nanotubes (NTs) were synthesized by facile layer-by-layer (LbL) self-assembly on polymeric nanofiber (NF) templates followed by calcination. Polymeric NFs using poly(methyl methacrylate) (PMMA) were prepared by electrospinning as sacrificial templates. Then, ionic polymers were coated on PMMA to modify the surface charge of PMMA NFs. Catalyst-loaded WO3 NTs were synthesized by self-assembly of tungsten precursor and catalytic precursor on the surface of the polymeric PMMA NFs followed by calcination at 500 degrees C for 1 h. Gas sensing performances were evaluated in highly humid atmosphere (90% RH) using pristine WO3 NTs, Pt-loaded WO3 NTs (Pt-WO3 NTs), and Pd-loaded WO3 NTs (Pd-WO3 NTs). Pristine WO3 NTs exhibited a high NO response (R-air/R-gas = 63.59 at 5 ppm) at 350 degrees C and cross-selectivity toward toluene (R-air/R-gas = 1.05 at 5 ppm). On the other hand, Pt-WO3 NTs and Pd-WO3 NTs exhibited a high toluene response (R-air/R-gas = 2.24 for the Pt-WO3 NTs and R-air/R-gas = 2.35 for the Pd-WO3 NTs at 5 ppm) at 400 degrees C and a negligible NO response (R-air/R-gas = 1.25 for the Pt-WO3 NTs and R-air/R-gas = 1.04 for the Pd-WO3 NTs at 5 ppm) at 400 degrees C. These results demonstrated that LbL synthesis is a highly promising method for producing hollow semiconductor metal oxide NTs functionalized with various catalysts, which leads to potential application in exhaled breath analysis for asthma and lung cancer diagnosis. (C) 2015 Elsevier B.V. All rights reserved.
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