title: Effect of Pt nanoparticles on the optical gas sensing properties of WO3 thin films.
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.
authors: Cristal·lografía de Materials i Nanomaterials (FiCMA-FiCNA)-EMaS, Universitat Rovira i Virgili, (URV), Campus Sescelades, c/Marcel·í Domingo s/n, Tarragona 43007, Spain. eduard.llobet@urv.cat.
authors: Muhammad U
authors: MU
authors: Qadri
authors: Dipartimento di Ingegneria Industriale,Universita' di Padova,Via Marzolo 9, Padova 35131, Italy. didialfanet@hotmail.com.
authors: Alex Fabian Diaz
authors: AF
authors: Diaz
authors: Dipartimento di Ingegneria Industriale,Universita' di Padova,Via Marzolo 9, Padova 35131, Italy. michela.cittadini@gmail.com.
authors: Michaela
authors: M
authors: Cittadini
authors: Dipartimento di Ingegneria Industriale,Universita' di Padova,Via Marzolo 9, Padova 35131, Italy. alex.martucci@unipd.it.
authors: Alessandro
authors: A
authors: Martucci
authors: Cristal·lografía de Materials i Nanomaterials (FiCMA-FiCNA)-EMaS, Universitat Rovira i Virgili, (URV), Campus Sescelades, c/Marcel·í Domingo s/n, Tarragona 43007, Spain. mariacinta.pujol@urv.cat.
authors: Maria Cinta
authors: MC
authors: Pujol
authors: Dept. d'Enginyeria Electronica i Automatica-EMaS, Universitat Rovira i Virgili, (URV), Campus Sescelades, c/Marcel·í Domingo s/n, Tarragona 43007, Spain. josep.ferre@urv.cat.
authors: Josep
authors: J
authors: Ferré-Borrull
authors: Microsystems and nanotechnologies for chemical analysis (MINOS-EMaS), Universitat Rovira i Virgili, (URV), Campus Sescelades, c/Marcel·í Domingo s/n, Tarragona 43007, Spain. eduard.llobet@urv.cat.
authors: Eduard
authors: E
authors: Llobet
authors: Cristal·lografía de Materials i Nanomaterials (FiCMA-FiCNA)-EMaS, Universitat Rovira i Virgili, (URV), Campus Sescelades, c/Marcel·í Domingo s/n, Tarragona 43007, Spain. magdalena.aguilo@urv.cat.
authors: Magdalena
authors: M
authors: Aguiló
authors: Cristal·lografía de Materials i Nanomaterials (FiCMA-FiCNA)-EMaS, Universitat Rovira i Virgili, (URV), Campus Sescelades, c/Marcel·í Domingo s/n, Tarragona 43007, Spain. f.diaz@urv.cat.
authors: Francesc
authors: F
authors: Díaz
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005740:Gases / Q000032:analysis* / Q000737:chemistry; D008567:Membranes, Artificial; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D010087:Oxides / Q000737:chemistry*; D010316:Particle Size; D010984:Platinum / Q000737:chemistry*; D013057:Spectrum Analysis / Q000295:instrumentation*; D014159:Transducers; D014414:Tungsten / Q000737:chemistry*
chemical_list: D005740:Gases; D008567:Membranes, Artificial; D010087:Oxides; D010984:Platinum; C511604:tungsten oxide; D014414:Tungsten