Structural and gas-sensing characterization of tungsten oxide nanorods and nanoparticles

Year: 2011

Authors: Ponzoni A., Russo V., Bailini A., Casari C.S., Ferroni M., Li Bassi A., Migliori A., Morandi V., Ortolani L., Sberveglieri G., Bottani C.E.

Autors Affiliation: CNR IDASC, SENSOR Lab, I-25133 Brescia, Italy;
Univ Brescia, Dept Chem & Phys, I-25133 Brescia, Italy;
Politecn Milan, Dipartimento Energia, I-20133 Milan, Italy;
Politecn Milan, NEMAS Ctr NanoEngineered Mat & Surfaces, I-20133 Milan, Italy;
Ctr Nano Sci & Technol IIT PoliMI, I-20133 Milan, Italy;
IMM CNR, Sez Bologna, I-40129 Bologna, Italy

Abstract: In this work we report on the preparation by Pulsed Laser Deposition (PLD) of tungsten oxide layers featuring different morphologies, dominated by either nanoparticles or nanorods, with the aim to investigate the different gas-sensing properties of these nanostructures. A detailed structural analysis is reported showing morphological stability of the films under thermal annealing and phase transition. Emphasis is also given to the characterization of networking connections of the prepared layers, determinant for the electrical properties of the chemiresistor devices. Results show that samples with nanorod morphology exhibit an increased specific sensitivity to ammonia. The higher sensitivity of nanoparticles to other compounds such as ethanol or acetone suggests that these complementary sensitivities can be exploited to obtain selective gas detection in electronic nose systems.

Journal/Review: SENSORS AND ACTUATORS B-CHEMICAL

Volume: 153 (2)      Pages from: 340  to: 346

More Information: Three of the authors (A.P., M.F. and G.S.) thanks the financial support from the European Community\’s 7th Framework Programme, under the grant agreement no 247768, and from the Russian Federation Government, under the State Contract 02.527.11.0008, within the collaborative Europe-Russia S3 project.
KeyWords: Tungsten oxide; nanorods; nanoparticles; gas sensor; pulsed laser deposition
DOI: 10.1016/j.snb.2010.10.045

Citations: 55
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