Sensors 2014, 14(7), 11427-11443; doi:10.3390/s140711427
Article

Effect of Pt Nanoparticles on the Optical Gas Sensing Properties of WO3 Thin Films

1,3,4email, 2email, 2email, 2email, 1,* email, 3email, 4email, 1email and 1email
Received: 12 March 2014; in revised form: 20 June 2014 / Accepted: 24 June 2014 / Published: 27 June 2014
(This article belongs to the Section Chemical Sensors)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Thin films of tungsten trioxide were deposited on quartz substrates by RF magnetron sputtering. Different annealing temperatures in the range from 423 to 973 K were used under ambient atmosphere. The influence of the annealing temperature on the structure and optical properties of the resulting WO3 thin films were studied. The surface morphology of the films is composed of grains with an average size near 70 nm for the films annealed between 773 and 973 K. Some of the WO3 thin films were also coated with Pt nanoparticles of about 45 nm in size. Spectrometric measurements of transmittance were carried out for both types of WO3 samples in the wavelength range from 200–900 nm, to determine the effect of the exposure to two different gases namely H2 and CO. Films showed fast response and recovery times, in the range of few seconds. The addition of Pt nanoparticles enables reducing the operation temperature to room temperature.
Keywords: WO3 films; optical gas sensing; H2; CO; gas; platinum nanoparticles
PDF Full-text Download PDF Full-Text [699 KB, uploaded 27 June 2014 11:40 CEST]

Export to BibTeX |
EndNote


MDPI and ACS Style

Qadri, M.U.; Diaz, A.F.D.; Cittadini, M.; Martucci, A.; Pujol, M.C.; Ferré-Borrull, J.; Llobet, E.; Aguiló, M.; Díaz, F. Effect of Pt Nanoparticles on the Optical Gas Sensing Properties of WO3 Thin Films. Sensors 2014, 14, 11427-11443.

AMA Style

Qadri MU, Diaz AFD, Cittadini M, Martucci A, Pujol MC, Ferré-Borrull J, Llobet E, Aguiló M, Díaz F. Effect of Pt Nanoparticles on the Optical Gas Sensing Properties of WO3 Thin Films. Sensors. 2014; 14(7):11427-11443.

Chicago/Turabian Style

Qadri, Muhammad U.; Diaz, Alex F.D.; Cittadini, Michaela; Martucci, Alessandro; Pujol, Maria C.; Ferré-Borrull, Josep; Llobet, Eduard; Aguiló, Magdalena; Díaz, Francesc. 2014. "Effect of Pt Nanoparticles on the Optical Gas Sensing Properties of WO3 Thin Films." Sensors 14, no. 7: 11427-11443.

Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert