Diazonium-derived aryl films on gold nanoparticles: evidence for a carbon-gold covalent bond

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DOIResolve DOI: http://doi.org/10.1021/nn201110r
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TypeArticle
Journal titleACS Nano
ISSN1936-0851
Volume5
Issue5
Pages42194227; # of pages: 9
SubjectCovalent modifications; DFT; Diazonium salts; Gold nanoparticles; HREELS; SERS; C (programming language); Carbon films; Density functional theory; Electron energy loss spectroscopy; Energy dissipation; Nanoparticles; Nitrobenzene; Raman scattering; Substrates; Surface chemistry; Gold; carbon; diazonium compound; gold; nanomaterial; article; chemistry; conformation; crystallization; macromolecule; materials testing; methodology; particle size; surface property; ultrastructure; Carbon; Crystallization; Diazonium Compounds; Gold; Macromolecular Substances; Materials Testing; Molecular Conformation; Nanostructures; Particle Size; Surface Properties
AbstractTailoring the surface chemistry of metallic nanoparticles is generally a key step for their use in a wide range of applications. There are few examples of organic films covalently bound to metal nanoparticles. We demonstrate here that aryl films are formed on gold nanoparticles from the spontaneous reduction of diazonium salts. The structure and the bonding of the film is probed with surface-enhanced Raman scattering (SERS). Extinction spectroscopy and SERS show that a nitrobenzene film forms on gold nanoparticles from the corresponding diazonium salt. Comparison of the SERS spectrum with spectra computed from density functional theory models reveals a band characteristic of a Au C stretch. The observation of this stretch is direct evidence of a covalent bond. A similar band is observed in high-resolution electron energy loss spectra of nitrobenzene layers on planar gold. The bonding of these types of films through a covalent interaction on gold is consistent with their enhanced stability observed in other studies. These findings provide motivation for the use of diazonium-derived films on gold and other metals in applications where high stability and/or strong adsorbate substrate coupling are required. © 2011 American Chemical Society.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); National Institute for Nanotechnology; NRC Steacie Institute for Molecular Sciences
Peer reviewedYes
NPARC number21271944
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Record identifier6d44469d-67e8-44bb-9435-72ba8abd114b
Record created2014-05-13
Record modified2016-05-09
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