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Mesostructured WO3 as a sensing material for NO2 detection

Published online by Cambridge University Press:  01 February 2011

E. Rossinyol ,
A. Prim ,
E. Pellicer ,
J. Arbiol ,
F. Peiró ,
A. Cornet ,
J. R. Morante ,
L. A. Solovyov ,
B. Tian  and
T. Bo
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E. Rossinyol
Affiliation:
erusinol@el.ub.es, University of Barcelona, Electronics, Martí i Franquès, 1, Barcelona, Catalonia, 08028, Spain
A. Prim
Affiliation:
aprim@el.ub.es, University of Barcelona, Electronics, Martí i Franquès, 1, Barcelona, Catalonia, 08028, Spain
E. Pellicer
Affiliation:
epellicer@el.ub.es, University of Barcelona, Electronics, Martí i Franquès, 1, Barcelona, Catalonia, 08028, Spain
J. Arbiol
Affiliation:
arbiol@sct.ub.es, University of Barcelona, Electronics, Martí i Franquès, 1, Barcelona, Catalonia, 08028, Spain
F. Peiró
Affiliation:
paqui@el.ub.es, University of Barcelona, Electronics, Martí i Franquès, 1, Barcelona, Catalonia, 08028, Spain
A. Cornet
Affiliation:
cornet@el.ub.es, University of Barcelona, Electronics, Martí i Franquès, 1, Barcelona, Catalonia, 08028, Spain
J. R. Morante
Affiliation:
morante@el.ub.es, University of Barcelona, Electronics, Martí i Franquès, 1, Barcelona, Catalonia, 08028, Spain
L. A. Solovyov
Affiliation:
leosol@icct.ru, Institute of Chemistry and Chemical Technology, K. Marx av., 42, Krasnoyarsk, 660049, Russian Federation
B. Tian
Affiliation:
tianbz@cmliris.harvard.edu, Fudan University, Molecular Catalysis and Innovative Materials Laboratory, Department of Chemistry, Shanghai, N/A, 200433, China, People's Republic of
T. Bo
Affiliation:
botu@fudan.edu.cn, Fudan University, Molecular Catalysis and Innovative Materials Laboratory, Department of Chemistry, Shanghai, N/A, 200433, China, People's Republic of
D. Zhao
Affiliation:
dyzhao@fudan.edu.cn, Fudan University, Molecular Catalysis and Innovative Materials Laboratory, Department of Chemistry, Shanghai, N/A, 200433, China, People's Republic of
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Abstract

Nanostructured tungsten oxide synthesized from SiO2 templates (SBA-15 and KIT-6) has been used for NO2 gas sensing. Chromium has been added as catalytic additive to WO3 in order to enhance sensor response. Several techniques have been used for identifying both additive location in the tungsten oxide matrix and its oxidation state. Raman spectroscopy confirmed the presence of terminal chromium-oxygen bonds at the material surface. Besides, X-ray photoelectron spectroscopy showed chromium peaks attributable to Cr(III) species. Electrical behavior of pure WO3 has found to be highly dependent on the nanostructure type, i. e. 2D SBA-15 and 3D KIT-6 replicas. Chromium addition diminishes response time and improves sensor response at low NO2 concentrations. Electrical differences due to WO3 nanostructure disappears as a result of additive introduction in the material.

Keywords

nanostructuresensorsemiconducting
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 915: Symposium R – Nanostructured Materials and Hybrid Composites for Gas Sensors and Biomedical Applications , 2006 , 0915-R06-09
Copyright
Copyright © Materials Research Society 2006

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