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Mesoscale organization of titania thin films enables oxygen sensing at room temperature

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Abstract

The application of titania materials to gas sensing devices based on thin films are of limited utility because they only operate at a high working temperature and exhibit in general a low sensitivity. To overcome these constraints, a new type of oxygen sensor based on mesoporous titania thin films working at room temperature under UV irradiation has been developed. The increased density of charge carriers induced by the photoconductive effect, has been used to enhance the sensitivity of the thin oxide layers. Mesostructured titania films have been prepared via self-assembly and thermal processing to remove the organic template obtaining anatase nanocrystals. The mesoporous films show a striking decrease of the current in the presence of oxygen that acts as an electron scavenger. Mesoporous samples exhibit a much higher response with respect to dense titania, due to the higher surface area and the larger number of surface defects.

Graphical abstract: Mesoscale organization of titania thin films enables oxygen sensing at room temperature

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Publication details

The article was received on 28 Jul 2017, accepted on 10 Oct 2017 and first published on 11 Oct 2017


Article type: Paper
DOI: 10.1039/C7TC03397D
Citation: J. Mater. Chem. C, 2017, Advance Article
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    Mesoscale organization of titania thin films enables oxygen sensing at room temperature

    P. Rassu, L. Malfatti, D. Carboni, M. F. Casula, S. Garroni, E. Zampetti, A. Macagnano, A. Bearzotti and P. Innocenzi, J. Mater. Chem. C, 2017, Advance Article , DOI: 10.1039/C7TC03397D

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