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Issue 11, 2012
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Pt doping triggers growth of TiO2nanorods: nanocomposite synthesis and gas-sensing properties

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Abstract

TiO2 nanocrystals were prepared by solvothermal treatment in oleic acid at 250 °C of amorphous TiO2 nanoparticles. The latter were prepared by sol–gel processing in dodecylamine at 100 °C of starting solutions synthesized from TiCl4. For preparing Pt/TiO2 nanocomposites, with Pt/Ti nominal atomic ratio of 0.05, the required amount of Pt precursor was added to the amorphous TiO2 nanoparticles before heating at 250 °C. Control synthesis experiments, evaluated by X-ray diffraction and X-ray photoelectron spectroscopy showed Pt(acac)2 as the best Pt precursor, and 250 °C as the optimum temperature for simultaneous TiO2 crystallization and efficient Pt nucleation. Transmission electron microscopy observations evidenced Pt nanocrystals dispersed in the surrounding TiO2 host, with a mean size of 4 nm. The TiO2 host was constituted of rod-shaped anatase nanocrystals. Comparison with pure TiO2 showed that the rod shape was favored by the presence of Pt species. As an example of application, the nanocomposites were used for preparing ethanol-sensing devices. The Pt addition remarkably improved the response with respect to pure TiO2 sensors, and electrical characterization of the sensors helped in establishing that the effect of Pt was due to spillover rather than electronic sensitization.

Graphical abstract: Pt doping triggers growth of TiO2 nanorods: nanocomposite synthesis and gas-sensing properties

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Supplementary files

Article information


Submitted
16 Dec 2011
Accepted
05 Mar 2012
First published
12 Mar 2012

CrystEngComm, 2012,14, 3882-3887
Article type
Paper

Pt doping triggers growth of TiO2 nanorods: nanocomposite synthesis and gas-sensing properties

M. Epifani, T. Andreu, R. Zamani, J. Arbiol, E. Comini, P. Siciliano, G. Faglia and J. R. Morante, CrystEngComm, 2012, 14, 3882
DOI: 10.1039/C2CE06690D

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