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A spectroscopic stu...
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Watcharinyanon, Somsakul,1978-Karlstads universitet,Avdelningen för fysik och elektroteknik,Materialfysik,Karlstad University
(author)
A spectroscopic study of self-assembled monolayer of porphyrin-functionalized oligo(phenyleneethynylene)s on gold : the influence of the anchor moiety
- Article/chapterEnglish2008
Publisher, publication year, extent ...
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London :RSC Publishing,2008
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:kau-2864
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https://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-2864URI
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https://doi.org/10.1039/b802914hDOI
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https://research.chalmers.se/publication/86247URI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
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Porphyrin-functionalized oligo(phenyleneethynylene)s (OPE) are promising molecules for molecular electronics applications. Three such molecules (1-3) with the common structure P-OPE-AG (P and AG are a porphyrin and anchor group, respectively) and different anchor groups, viz. an acetyl protected thiol, -S-COCH3 (1), an acetyl protected thiol with methylene linker, -CH2-S-COCH3 (2), and a trimethylsilylethynyl group, -C(triple bond)C-Si(CH3)3 (3) have been synthesized and the corresponding self-assembled monolayers (SAMs) on Au(111) substrates have been prepared. The integrity and structural properties of these films were studied by X-ray photoelectron spectroscopy and near-edge X-ray absorption fine structure spectroscopy. The results suggest that the films formed from 1 have a high orientational order with an almost upright orientation and dense packing of the molecular constituents, i.e. represent a high quality SAM. In contrast, molecule 2 formed disordered molecular layers on Au, even though the molecule-surface bonding (thiolate) is the same as in the case of molecule 1. This suggests that the methylene linker in molecule 2 has a strong impact on the quality of the resulting film, so that a well-ordered SAM cannot be formed. The silane system, 3, is also able to bind to the gold surface but the resulting SAM has a poor quality, being significantly disordered and/or comprised of strongly inclined molecules. The above results suggest that the nature of the anchor group along with a possible linker is an important parameter which, to a high extent, predetermines the entire quality of OPE-based molecular layers
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Nilsson, DanielDepartment of Chemical and Biological Engineering, Chalmers University of Technology,Chalmers tekniska högskola,Chalmers University of Technology
(author)
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Moons, Ellen,1966-Karlstads universitet,Avdelningen för fysik och elektroteknik,Materialfysik,Karlstad University(Swepub:kau)ellemoon
(author)
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Shaporenko, AndreyAngewandte Physikalische Chemie, Universität Heidelberg im Neuenheimer Feld 253,Ruprecht-Karls-Universität Heidelberg,Heidelberg University
(author)
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Zharnikov, MichaelAngewandte Physikalische Chemie, Universität Heidelberg im Neuenheimer Feld 253,Ruprecht-Karls-Universität Heidelberg,Heidelberg University
(author)
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Albinsson, Bo,1963Department of Chemical and Biological Engineering, Chalmers University of Technology,Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)balb
(author)
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Mårtensson, Jerker,1965Department of Chemical and Biological Engineering, Chalmers University of Technology,Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)jerker
(author)
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Johansson, Lars S.O.1956-Karlstads universitet,Avdelningen för fysik och elektroteknik,Materialfysik,Karlstad University(Swepub:kau)larsjoh
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Karlstads universitetAvdelningen för fysik och elektroteknik
(creator_code:org_t)
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In:Physical Chemistry, Chemical Physics - PCCPLondon : RSC Publishing10:34, s. 5264-52751463-90761463-9084
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