Pt/WO3 thin films prepared by photochemical metal-organic deposition (PMOD) and its evaluation as carbon monoxide sensor

G. E. Buono-Core; A. H. Klahn; G. Cabello; E. Muñoz; M. J. Bustamante; C. Castillo; B. Chornik

doi:10.1016/j.poly.2012.04.028

Pt/WO₃ thin films prepared by photochemical metal-organic deposition (PMOD) and its evaluation as carbon monoxide sensor

G. E. Buono-Core, A. H. Klahn, G. Cabello, E. Muñoz, M. J. Bustamante, C. Castillo, B. Chornik

INSTITUTE OF CHEMISTRY

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Pure and 10% Pt-loaded tungsten oxide thin films have been successfully prepared by direct UV irradiation of bis(β-diketonate)dioxotungsten(VI) and Pt(II) precursor complexes spin-coated on Si(1 0 0) substrates. X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) techniques were used to analyze the crystal structure and chemical composition of the films before and after heat treatment at 500°C. The results of XRD and AFM analysis showed that the as-photodeposited films are amorphous and have a rougher surface than thermally treated films. Post-annealing of the films in air at 500°C transforms the oxides to a monoclinic WO₃ phase. Gas sensing tests reveal that annealed 10% Pt/WO₃ films exhibit a better response than unloaded WO₃ films towards 20 ppm carbon monoxide at an operating temperature of 350°C. The sensors also posses fast response and recovery characteristics.

Original language	English
Pages (from-to)	134-139
Number of pages	6
Journal	Polyhedron
Volume	41
Issue number	1
DOIs	https://doi.org/10.1016/j.poly.2012.04.028
State	Published - 28 Jun 2012

Keywords

Catalytic properties
Photoelectron spectroscopy
Thin films
X-ray diffraction

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@article{d8e8e40773914757a439bf02e988d8e3,

title = "Pt/WO3 thin films prepared by photochemical metal-organic deposition (PMOD) and its evaluation as carbon monoxide sensor",

abstract = "Pure and 10% Pt-loaded tungsten oxide thin films have been successfully prepared by direct UV irradiation of bis(β-diketonate)dioxotungsten(VI) and Pt(II) precursor complexes spin-coated on Si(1 0 0) substrates. X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) techniques were used to analyze the crystal structure and chemical composition of the films before and after heat treatment at 500°C. The results of XRD and AFM analysis showed that the as-photodeposited films are amorphous and have a rougher surface than thermally treated films. Post-annealing of the films in air at 500°C transforms the oxides to a monoclinic WO3 phase. Gas sensing tests reveal that annealed 10% Pt/WO3 films exhibit a better response than unloaded WO3 films towards 20 ppm carbon monoxide at an operating temperature of 350°C. The sensors also posses fast response and recovery characteristics.",

keywords = "Catalytic properties, Photoelectron spectroscopy, Thin films, X-ray diffraction",

author = "Buono-Core, {G. E.} and Klahn, {A. H.} and G. Cabello and E. Mu{\~n}oz and Bustamante, {M. J.} and C. Castillo and B. Chornik",

note = "Funding Information: This research was supported by FONDECYT , Chile (Project No. 1080225) and Pontificia Universidad Cat{\'o}lica de Valpara{\'i}so (Project D.I. No. 125.727/08).",

year = "2012",

month = jun,

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doi = "10.1016/j.poly.2012.04.028",

language = "English",

volume = "41",

pages = "134--139",

journal = "Polyhedron",

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T1 - Pt/WO3 thin films prepared by photochemical metal-organic deposition (PMOD) and its evaluation as carbon monoxide sensor

AU - Buono-Core, G. E.

AU - Klahn, A. H.

AU - Cabello, G.

AU - Muñoz, E.

AU - Bustamante, M. J.

AU - Castillo, C.

AU - Chornik, B.

N1 - Funding Information: This research was supported by FONDECYT , Chile (Project No. 1080225) and Pontificia Universidad Católica de Valparaíso (Project D.I. No. 125.727/08).

PY - 2012/6/28

Y1 - 2012/6/28

N2 - Pure and 10% Pt-loaded tungsten oxide thin films have been successfully prepared by direct UV irradiation of bis(β-diketonate)dioxotungsten(VI) and Pt(II) precursor complexes spin-coated on Si(1 0 0) substrates. X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) techniques were used to analyze the crystal structure and chemical composition of the films before and after heat treatment at 500°C. The results of XRD and AFM analysis showed that the as-photodeposited films are amorphous and have a rougher surface than thermally treated films. Post-annealing of the films in air at 500°C transforms the oxides to a monoclinic WO3 phase. Gas sensing tests reveal that annealed 10% Pt/WO3 films exhibit a better response than unloaded WO3 films towards 20 ppm carbon monoxide at an operating temperature of 350°C. The sensors also posses fast response and recovery characteristics.

AB - Pure and 10% Pt-loaded tungsten oxide thin films have been successfully prepared by direct UV irradiation of bis(β-diketonate)dioxotungsten(VI) and Pt(II) precursor complexes spin-coated on Si(1 0 0) substrates. X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) techniques were used to analyze the crystal structure and chemical composition of the films before and after heat treatment at 500°C. The results of XRD and AFM analysis showed that the as-photodeposited films are amorphous and have a rougher surface than thermally treated films. Post-annealing of the films in air at 500°C transforms the oxides to a monoclinic WO3 phase. Gas sensing tests reveal that annealed 10% Pt/WO3 films exhibit a better response than unloaded WO3 films towards 20 ppm carbon monoxide at an operating temperature of 350°C. The sensors also posses fast response and recovery characteristics.

KW - Catalytic properties

KW - Photoelectron spectroscopy

KW - Thin films

KW - X-ray diffraction

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JO - Polyhedron

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ER -

Pt/WO₃ thin films prepared by photochemical metal-organic deposition (PMOD) and its evaluation as carbon monoxide sensor

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