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Catalytic self-cleaning films for the built environment: Combining facet-texturing, acid-base functionalization and spectral selectivity
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.ORCID iD: 0000-0003-0296-5247
2017 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

The possibility to increase human comfort and reduce the global footprint of buildings is a powerful driving force for introduction of new building technology. Here advanced coating technologies play an important role. We demonstrate here that photocatalytic and self-cleaning films can be tailored such that they can be up-scaled with available sputtering technologies. Three approaches to achieve these improved functions are presented. First, we show that facet-texturing to increase the fraction of exposed {001} increases the catalytic activity up to one order of magnitude [1]. In a second approach, surface functionalization of the films by sulfate and nitrate groups renders the surfaces resilient towards deactivation in dry conditions by a proton transfer mechanism [2,3]. In such films bonding of acidic intermediates originating VOC pollutants is avoided which otherwise deactivate their surfaces. In addition, the wetting properties of the TiO2 films are also modified to make them repel e.g. fatty acids and thus possess excellent anti-greasing functionality [4]. In the third approach, TiO2 is deposited on visible-infrared light absorbing films, whereby heat generated in the underlying light absorbing film heats the TiO2 film. We show that increasing the temperature of the TiO2 film results in an increased photocatalytic activity by two mechanisms: thermal activation to increase reaction kinetics, and by shifting the water gas-surface equilibrium coverage to free surface sites for reactant molecules. We generalize the results, and discuss their implications for green building technology and possible scenarios for their implementation.

[1] B. Stefanov, G. Niklasson, C.G. Granqvist, L. Österlund, J. Mater. Chem. A 2015, 3, 17369-17375.

[2] B. I. Stefanov, J. Maibach, Z. Topalian, G. A. Niklasson, C. G. Granqvist, L. Österlund, ACS Catal., submitted.

[3] Z. Topalian, B. Stefanov, C.G. Granqvist, and L. Österlund, J. Catal. 2013, 307, 265-274.

[4] Z. Topalian, G. Niklasson, and L. Österlund, ACS Appl. Mater. Interfaces 2012, 4, 672−679.

Place, publisher, year, edition, pages
2017.
Keyword [en]
Self-cleaning, photocatalysis, facets, thermochromism
National Category
Engineering and Technology Natural Sciences
Research subject
Engineering Science with specialization in Nanotechnology and Functional Materials; Engineering Science with specialization in Solid State Physics; Chemistry with specialization in Chemical Physics
Identifiers
URN: urn:nbn:se:uu:diva-333096OAI: oai:DiVA.org:uu-333096DiVA: diva2:1155088
Conference
COST TO-BE Fall meeting, Riga, Latvia 11-13 Sep. 2017
Funder
Swedish Research Council, 2015-04757EU, FP7, Seventh Framework Programme, 608950
Available from: 2017-11-06 Created: 2017-11-06 Last updated: 2017-11-06

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