Acetone sensors based on TiO2 nanocrystals modified with tungsten oxide species

Year: 2016

Authors: Epifani M., Comini E., Diaz R., Genc A., Andreu T., Siciliano P., Morante JR.

Autors Affiliation: CNR, IMM, Via Monteroni C-O Campus Univ, I-73100 Lecce, Italy; Univ Brescia, Dept Informat Engn, SENSOR Lab, Via Valotti 9, I-25133 Brescia, Italy; CNR INO, Via Valotti 9, I-25133 Brescia, Italy; IMDEA Energy Inst, Electrochem Proc Unit, Avda Ramon Sagra 3, Mostoles 28935, Spain; Bartin Univ, Fac Engn, Met & Mat Engn Dept, TR-74100 Bartin, Turkey; Catalonia Inst Energy Research IREC, Jardins Dones de Negre 1, E-08930 Barcelona, CAT, Spain; Univ Barcelona, Dept Elect, C Marti & Franques 1, E-08028 Barcelona, Spain.

Abstract: TiO2 nanocrystals were prepared by solegel/solvothermal processing and modified by the addition of W precursor before the solvothermal step. The W: Ti nominal atomic ratio (R-W) was fixed to 0.16 and 0.64. Surface modification of TiO2 occurred for R-W = 0.16 while for R-W = 0.64 nanocomposites with WO3 nanocrystals were obtained after heat-treatment at 500 degrees C. Pure TiO2 proved to be very poorly performing in acetone sensing in all the operating conditions. Instead, the addition of bothWconcentrations largely enhanced the sensor response. It ranged over two orders of magnitude of conductance variation for all the tested concentrations at as low as 200 degrees C operating temperature. The results showed that it is possible to enhance the performance of an otherwise almost inactive oxide like TiO2 by proper combination with another more active oxide like WO3. (C) 2016 Elsevier B.V. All rights reserved.

Journal/Review: JOURNAL OF ALLOYS AND COMPOUNDS

Volume: 665      Pages from: 345  to: 351

More Information: Authors acknowledge CSIC/CNR project 2010IT0001 (SYNCA-ON) and the SOLAR project DM19447. We thank Giovanni Battista Pace for the help with the sample preparation, and Nicola Poli for the help with the sensing measurements. A.G. acknowledges the funding from Generalitat de Catalunya 2014 SGR 1638, the Spanish MICINN project e-ATOM (MAT2014-51480-ERC) and the Turkish Ministry of National Education for the PhD scholarship. We also thank Jordi Arbiol for the additional HRTEM characterization.
KeyWords: Nanocrystalline TiO2; Chemical synthesis; Sol-gel process; Gas-sensor; Electrical conductivity
DOI: 10.1016/j.jallcom.2016.01.077

Citations: 32
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