Shape-controlled TiO2 nanoparticles and TiO2 P25 interacting with CO and H2O2 molecular probes: a synergic approach for surface structure recognition and physico-chemical understanding

Chiara Deiana; Marco Minella; Gloria Tabacchi; Valter Maurino; Ettore Fois; Gianmario Martra

doi:10.1039/C2CP42381B

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Shape-controlled TiO₂nanoparticles and TiO₂ P25 interacting with CO and H₂O₂ molecular probes: a synergic approach for surface structure recognition and physico-chemical understanding†

Chiara Deiana,^ab Marco Minella,^a Gloria Tabacchi,^b Valter Maurino,^a Ettore Fois^b and Gianmario Martra*^a

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* Corresponding authors

^a Department of Chemistry and Interdepartmental Centre of Excellence “Nanostructured Interfaces and Surfaces-NIS”, University of Torino, via P. Giuria 7, 10125 Torino, Italy
E-mail: gianmario.martra@unito.it
Fax: +39 0116707855
Tel: +39 0116707538

^b Department of Science and High Technology, University of Insubria and INSTM, via Lucini 3, 22100 Como, Italy

Abstract

Integrated studies of CO on truncated bipyramidal TiO₂ anatase nanoparticles mainly exposing smooth (101) surfaces provide the missing link between TiO₂ single crystals and commercial TiO₂ nanopowders with complex morphology. The synergy among high resolution transmission electron microscopy, IR spectroscopy and modeling correlates adsorbed CO stretching frequency to anatase surface types, and reveals how disorder of the adsorbed CO layer affects CO/TiO₂ IR bands. Comparison of the two TiO₂ nanoparticle types highlights the role of low coordination Ti⁴⁺ sites selectively present on TiO₂ P25 in the photocatalytic decomposition of H₂O₂, an important Reactive Oxygen Species (ROS) formed in photocatalytic processes.

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Article information

DOI: https://doi.org/10.1039/C2CP42381B
Article type: Paper
Submitted: 12 Jul 2012
Accepted: 22 Oct 2012
First published: 23 Oct 2012

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Phys. Chem. Chem. Phys., 2013,15, 307-315

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Shape-controlled TiO₂ nanoparticles and TiO₂ P25 interacting with CO and H₂O₂ molecular probes: a synergic approach for surface structure recognition and physico-chemical understanding

C. Deiana, M. Minella, G. Tabacchi, V. Maurino, E. Fois and G. Martra, Phys. Chem. Chem. Phys., 2013, 15, 307 DOI: 10.1039/C2CP42381B

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