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In-situ evaluation of dye adsorption on TiO2 using QCM
KTH Royal Inst Technol, Dept Chem, Div Surface & Corros Sci, S-10044 Stockholm, Sweden.;KTH Royal Inst Technol, Mat Phys, ICT, S-16440 Stockholm, Sweden..
KTH Royal Inst Technol, Dept Chem, Div Surface & Corros Sci, S-10044 Stockholm, Sweden.;IMDEA Nanociencia, Inst Adv Studies, Faraday 9,Campus Cantoblanco, Madrid 28049, Spain..
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.ORCID iD: 0000-0001-6897-2808
KTH Royal Inst Technol, Dept Chem Fiber & Polymer Technol, S-10044 Stockholm, Sweden..
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2017 (English)In: EPJ Photovoltaics, ISSN 2105-0716, Vol. 8, 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 S A , 2017. Vol. 8, 80401
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-320219DOI: 10.1051/epjpv/2017002ISI: 000396159700001OAI: oai:DiVA.org:uu-320219DiVA: diva2:1088913
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Available from: 2017-04-18 Created: 2017-04-18 Last updated: 2017-04-18Bibliographically approved

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