Photochemistry of Carboxylate on TiO2(110) Studied with Synchrotron Radiation Photoelectron Spectroscopy

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Sandell, AndersUppsala University,Uppsala universitet,Molekyl- och kondenserade materiens fysik (author)

Photochemistry of Carboxylate on TiO2(110) Studied with Synchrotron Radiation Photoelectron Spectroscopy

Article/chapterEnglish2016

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2016-10-27
American Chemical Society (ACS),2016
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LIBRIS-ID:oai:DiVA.org:uu-310759
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-310759URI
https://doi.org/10.1021/acs.langmuir.6b02989DOI
https://lup.lub.lu.se/record/65ec3ff8-dae1-4457-b5eb-53c0b8c69f96URI

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Language:English
Summary in:English

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SwePubSwePub

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Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

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We present a dedicated synchrotron radiation photoelectron spectroscopy (SR-PES) study of a photochemical reaction on the surface of rutile TiO2(110). The photoreaction kinetics of carboxylate species (trimethyl acetate, TMA) upon irradiation by UV and soft X-rays were monitored, and we show that it is possible to control the reaction rates from UV light and soft X-rays independently. We directly observe Ti4+ -> Ti3+ conversion upon irradiation, attributed to electron trapping at Ti sites close to surface OH groups formed by deprotonation of the parent molecule, trimethylacetic acid (TMAA). TMA photolysis on two surface preparations with different oxygen vacancy densities shows that the vacancy-related charge quenches the amount of charge that can be trapped at hydroxyls upon irradiation. During the initial stages of reaction the correlation between the amount of photodepleted TMA and the amount of charge trapped in the Ti 3d band gap state is nearly 1:1. A first-order kinetics analysis reveals that the reaction rate decreases with decreasing TMA coverage. There is also a coverage-dependent difference in the electronic structure of TMA moieties, primarily involving the carboxyl anchor group. These changes are consistent with a decreased hole affinity of the adsorbed TMA and hence a decreased reaction rate. This discovery adds to the previously presented picture of a reactivity that is inversely proportional to the number of surface hydroxyls, suggesting that the balance between the amounts of TMA, OH, and trapped charge needs to be considered.

Subject headings and genre

NATURVETENSKAP Fysik Den kondenserade materiens fysik hsv//swe
NATURAL SCIENCES Physical Sciences Condensed Matter Physics hsv//eng
NATURVETENSKAP Kemi Oorganisk kemi hsv//swe
NATURAL SCIENCES Chemical Sciences Inorganic Chemistry hsv//eng

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Ragazzon, DavideUppsala University,Uppsala universitet,Molekyl- och kondenserade materiens fysik(Swepub:uu)davra358 (author)
Schaefer, A.Lund University,Lunds universitet,Synkrotronljusfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Synchrotron Radiation Research,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)slju-aas (author)
Farstad, M. H.Norwegian Univ Sci & Technol NTNU, Dept Phys, NO-7491 Trondheim, Norway.,Norwegian University of Science and Technology (author)
Borg, A.Norwegian Univ Sci & Technol NTNU, Dept Phys, NO-7491 Trondheim, Norway.,Norwegian University of Science and Technology (author)
Uppsala universitetMolekyl- och kondenserade materiens fysik (creator_code:org_t)

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In:Langmuir: American Chemical Society (ACS)32:44, s. 11456-114640743-74631520-5827

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By the author/editor: Sandell, Anders; Ragazzon, Davide; Schaefer, A.; Farstad, M. H.; Borg, A.

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Inorganic Chemis ...

Articles in the publication: Langmuir

By the university: Uppsala University; Lund University

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