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Photo-induced changes in the Langmuir adsorption constants of metal oxide layers in self-cleaning cation sensors.

Foran, Philip and Boxall, Colin (2012) Photo-induced changes in the Langmuir adsorption constants of metal oxide layers in self-cleaning cation sensors. Materials Research Society Symposium Proceedings, 1406.

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    Abstract

    For the first time, we have used a metal oxide-coated quartz crystal microbalance (QCM) to measure Cs+ adsorption onto illuminated and un-illuminated mesoporous TiO2 (m-TiO2) films by microgravimetric means in-situ. In the simplest case, such experiments yield two parameters of interest: K, the Langmuir adsorption coefficient and mmax the maximum mass of adsorbate to form a complete monolayer at the m-TiO2-coated quartz crystal piezoelectric surface. Importantly, we have found that illumination of the m-TiO2 film with ultra bandgap light results in an increase in mmax i.e. illumination allows for greater adsorption of substrate to occur than in the dark. Our studies also show that under illumination, K also increases indicating a higher affinity for surface adsorption. The photoinduced change in mmax and K are thought to be due to an increase in surface bound titanol groups, thus increasing the number of available adsorption sites – and so providing evidence to support the notion of photoinduced adsorption processes in photocatalytic systems. These findings have implications for the development of a reversible adsorption based microgravimetric sensor for Cs+.

    Item Type: Article
    Journal or Publication Title: Materials Research Society Symposium Proceedings
    Additional Information: Copyright © Materials Research Society 2012
    Uncontrolled Keywords: piezoresponse ; sensor ; thin film
    Subjects:
    Departments: Faculty of Science and Technology > Engineering
    ID Code: 52725
    Deposited By: ep_importer_pure
    Deposited On: 05 Mar 2012 13:53
    Refereed?: Yes
    Published?: Published
    Last Modified: 09 Apr 2014 23:07
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/52725

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