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The influence of molecular mobility on the properties of networks of gold nanoparticles and organic ligands

Devid, E.J.; Martinho, Paulo N.; Kamalakar, M.V.; Prendergast, Ú.; Kübel, C.; Lemma, T.; Dayen, J.-F.; Keyes, T.E.; Doudin, B.; Ruben, M.; van der Molen, S.J.

We prepare and investigate two-dimensional (2D) single-layer arrays and multilayered networks of gold nanoparticles derivatized with conjugated hetero-aromatic molecules, i.e., S-(4-{[2,6-bipyrazol-1-yl)pyrid-4-yl]ethynyl}phenyl)thiolate (herein S-BPP), as capping ligands. These structures are fabricated by a combination of self-assembly and microcontact printing techniques, and are characterized by electron microscopy, UV–visible spectroscopy and Raman spectroscopy. Selective binding of the S-BPP molecules to the gold nanoparticles through Au–S bonds is found, with no evidence for the formation of N–Au bonds between the pyridine or pyrazole groups of BPP and the gold surface. Subtle, but significant shifts with temperature of specific Raman S-BPP modes are also observed. We attribute these to dynamic changes in the orientation and/or increased mobility of the molecules on the gold nanoparticle facets. As for their conductance, the temperature-dependence for S-BPP networks differs significantly from standard alkanethiol-capped networks, especially above 220 K. Relating the latter two observations, we propose that dynamic changes in the molecular layers effectively lower the molecular tunnel barrier for BPP-based arrays at higher temperatures.

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Verlagsausgabe §
DOI: 10.5445/IR/1000049200
Veröffentlicht am 27.04.2018
DOI: 10.3762/bjnano.5.177
Zitationen: 3
Web of Science
Zitationen: 3
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Karlsruhe Nano Micro Facility (KNMF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2014
Sprache Englisch
Identifikator ISSN: 2190-4286
KITopen-ID: 1000049200
HGF-Programm 43.16.02 (POF II, LK 02)
KNMF laboratory for microscopy a.spect.
Erschienen in Beilstein journal of nanotechnology
Band 5
Heft 1
Seiten 1664-1674
Schlagwörter aromatic capping ligands, gold nanoparticles, molecular charge transport, self-assembly, surface enhanced Raman spectroscopy
Nachgewiesen in Scopus
Web of Science
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