Flame-Made Nb-Doped TiO2 Ethanol and Acetone Sensors

Undoped TiO2 and TiO2 nanoparticles doped with 1–5 at.% Nb were successfully produced in a single step by flame spray pyrolysis (FSP). The phase and crystallite size were analyzed by XRD. The BET surface area (SSABET) of the nanoparticles was measured by nitrogen adsorption. The trend of SSABET on the doping samples increased and the BET equivalent particle diameter (dBET) (rutile) increased with the higher Nb-doping concentrations while dBET (anatase) remained the same. The morphology and accurate size of the primary particles were further investigated by high-resolution transmission electron microscopy (HRTEM). The crystallite sizes of undoped and Nb-doped TiO2 spherical were in the range of 10–20 nm. The sensing films were prepared by spin coating technique. The mixing sample was spin-coated onto the Al2O3 substrates interdigitated with Au electrodes. The gas sensing of acetone (25–400 ppm) was studied at operating temperatures ranging from 300–400 °C in dry air, while the gas sensing of ethanol (50–1,000 ppm) was studied at operating temperatures ranging from 250–400 °C in dry air.

[1]  Vincenzo Guidi,et al.  Doping of a nanostructured titania thick film: structural and electrical investigations , 2000 .

[2]  S. Karvinen,et al.  The effects of trace elements on the crystal properties of TiO2 , 2003 .

[3]  Chaikarn Liewhiran,et al.  Improvement of Flame-made ZnO Nanoparticulate Thick Film Morphology for Ethanol Sensing , 2007, Sensors (Basel, Switzerland).

[4]  G. L. Sharma,et al.  Mechanism in Nb doped titania oxygen gas sensor , 1998 .

[5]  Buckley Crist,et al.  Structure of Polycrystalline Aggregates , 2013 .

[6]  Joan Ramon Morante,et al.  Study of La and Cu influence on the growth inhibition and phase transformation of nano-TiO2 used for gas sensors , 2004 .

[7]  Taro Hitosugi,et al.  Transparent conducting Nb-doped anatase TiO2 (TNO) thin films sputtered from various oxide targets , 2010 .

[8]  Katarzyna Zakrzewska,et al.  Effect of Nb, Cr, Sn additions on gas sensing properties of TiO2 thin films , 1997 .

[9]  David E. Williams,et al.  Description and characterization of a hydrogen sulfide gas sensor based on Cr2-yTiyO3+x , 1995 .

[10]  Matteo Ferroni,et al.  Effects of Ta/Nb-doping on titania-based thin films for gas-sensing , 2005 .

[11]  G. L. Sharma,et al.  Effect of Nb metal ion in TiO2 oxygen gas sensor , 1996 .

[12]  Vincenzo Guidi,et al.  CO sensing properties of titanium and iron oxide nanosized thin films , 2001 .

[13]  Sotiris E. Pratsinis,et al.  Flame-made Nb- and Cu-doped TiO2 sensors for CO and ethanol , 2008 .

[14]  Naoto Kikuchi,et al.  Preparation of transparent conductive TiO2: Nb thin films by pulsed laser deposition , 2009 .

[15]  A. P. Rizzato,et al.  Characterization of Tin Oxide Based Sol-Gel Coatings on Borosilicate Glasses by X-Ray Reflectivity , 2000 .

[16]  Jean-Claude Jumas,et al.  Doped titanium dioxide nanocrystalline powders with high photocatalytic activity , 2009 .

[17]  W. Su,et al.  Effect of sinter temperature on the electrical properties of TiO2-based capacitor–varistors , 2003 .

[18]  Muralidhar K. Ghantasala,et al.  Sensitivity enhancement towards ethanol and methanol of TiO2 films doped with Pt and Nb , 2000 .

[19]  Jordi Arbiol,et al.  Study of the influence of Nb content and sintering temperature on TiO2 sensing films , 2003 .

[20]  Nicolae Barsan,et al.  Flame spray synthesis of tin dioxide nanoparticles for gas sensing , 2004 .

[21]  Pelagia-Irene Gouma,et al.  Sensing of Organic Vapors by Flame-Made TiO2 Nanoparticles , 2006 .

[22]  Monica Lira-Cantu,et al.  Nb-TiO2/polymer hybrid solar cells with photovoltaic response under inert atmosphere conditions , 2010 .

[23]  Toshinobu Yoko,et al.  Electrical Properties of Transparent Doped Oxide Films , 2000 .

[24]  Velimir Radmilovic,et al.  Synthesis, characterization and electrocatalytical behavior of Nb–TiO2/Pt nanocatalyst for oxygen reduction reaction , 2010 .

[25]  F. Bregani,et al.  Temperature effects on the size of anatase crystallites in MoTiO2 and WTiO2 powders , 1996 .

[26]  Takashi Murakami,et al.  Structural and surface property study of sputter deposited transparent conductive Nb-doped titanium oxide films , 2011 .

[27]  Nicolae Barsan,et al.  Flame spray synthesis of tin oxide nanoparticles for gas sensing , 2004 .

[28]  Giuliano Martinelli,et al.  Sol-Gel Processed TiO2-Based Nano-Sized Powders for Use in Thick-Film Gas Sensors for Atmospheric Pollutant Monitoring , 2001 .

[29]  R. W. Cheary,et al.  Axial Divergence in a Conventional X-ray Powder Diffractometer. I. Theoretical Foundations , 1998 .

[30]  Xenophon E. Verykios,et al.  Oxidative coupling of methane to C2 hydrocarbons over titania- based catalysts , 1992 .