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In-situ evaluation of dye adsorption on TiO2 using QCM
KTH, School of Engineering Sciences (SCI), Applied Physics, Material Physics, MF. KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0002-9828-7753
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
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2017 (English)In: EPJ Photovoltaics, ISSN 2105-0716, Vol. 8, article id 80401Article in journal (Refereed) Published
Abstract [en]

We measured the adsorption characteristics of two organic dyes; triphenylamine-cyanoacrylic acid (TPA-C) and phenoxazine (MP13), on TiO2, directly in a solution based on quartz crystal microbalance (QCM). Monitoring the adsorbed amount as a function of dye concentration and during rinsing allows determination of the equilibrium constant and distinction between chemisorbed and physisorbed dye. The measured equilibrium constants are 0.8 mM(-1) for TPA-C and 2.4 mM(-1) for MP13. X-ray photoelectron spectroscopy was used to compare dried chemisorbed layers of TPA-C prepared in solution with TPA-C layers prepared via vacuum sublimation; the two preparation methods render similar spectra except a small contribution of water residues (OH) on the solution prepared samples. Quantitative Nanomechanical Mapping Atomic Force Microscopy (QNM-AFM) shows that physisorbed TPA-C layers are easily removed by scanning the tip across the surface. Although not obvious in height images, adhesion images clearly demonstrate removal of the dye.

Place, publisher, year, edition, pages
EDP Sciences, 2017. Vol. 8, article id 80401
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Chemical Sciences
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URN: urn:nbn:se:kth:diva-248715DOI: 10.1051/epjpv/2017002ISI: 000396159700001Scopus ID: 2-s2.0-85061784497OAI: oai:DiVA.org:kth-248715DiVA, id: diva2:1303691
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QC 20190514

Available from: 2019-04-10 Created: 2019-04-10 Last updated: 2019-10-09Bibliographically approved

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Besharat, ZahraAlvarez-Asencio, RubenJohnson, C. MagnusRutland, Mark W.

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