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Electrodeposition of oligothiophene-linked gold nanoparticle films

TitleElectrodeposition of oligothiophene-linked gold nanoparticle films
Publication TypeJournal Article
Year of Publication2004
AuthorsSih, BC, Teichert, A, Wolf, MO
JournalCHEMISTRY OF MATERIALS
Volume16
Pagination2712-2718
Date PublishedJUL 13
ISSN0897-4756
Abstract

The electrodeposition and characterization of conducting thin films of gold nanoparticles bridged with oligothiophene linkers are reported. Gold nanoparticles capped with the conjugated phosphines 5-diphenylphosphino-2,2':5',2{''}-terthiophene (d(core) = 1.7 +/- 0.3 nm) and 5-diphenylphosphino-3',4'-ethylenedioxy-2,2':5',2{''}-terthiophene (d(core) = 1.8 +/- 0.4 nm) have been prepared. Electrochemical oxidation of these particles results in the deposition of thin films consisting of intact nanoparticles linked by oligothiophene moieties, in which the pi-pi{*} absorption of both the conjugated linker and the plasmon band are red-shifted relative to individual nanoparticles. Conductivities of both the unlinked and linked particles are measured and the latter are shown to have substantially higher conductivities than unlinked particles or gold nanoparticles linked by saturated alkyl chain linkers.

DOI10.1021/cm035242n