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Interactions of Phenyldithioesters with Gold Nanoparticles (AuNPs) : implications for AuNP functionalization and molecular barcoding of AuNP assemblies
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Blakey, Idriss, Schiller, Tara L., Merican, Zul and Fredericks, Peter M. (2010) Interactions of Phenyldithioesters with Gold Nanoparticles (AuNPs) : implications for AuNP functionalization and molecular barcoding of AuNP assemblies. Langmuir, Volume 26 (Number 2). pp. 692-701. doi:10.1021/la9023162 ISSN 0743-7463.
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Official URL: http://dx.doi.org/10.1021/la9023162
Abstract
The interactions of phenyldithioesters with gold nanoparticles (AuNPs) have been studied by monitoring changes in the surface plasmon resonance (SPR), depolarised light scattering, and surface enhanced Raman spectroscopy (SERS). Changes in the SPR indicated that an AuNP-phenyldithioester charge transfer complex forms in equilibrium with free AuNPs and phenyldithioester. Analysis of the Langmuir binding isotherms indicated that the equilibrium adsorption constant, Kads, was 2.3 ± 0.1 × 106 M−1, which corresponded to a free energy of adsorption of 36 ± 1 kJ mol−1. These values are comparable to those reported for interactions of aryl thiols with gold and are of a similar order of magnitude to moderate hydrogen bonding interactions. This has significant implications in the application of phenyldithioesters for the functionalization of AuNPs. The SERS results indicated that the phenyldithioesters interact with AuNPs through the C═S bond, and the molecules do not disassociate upon adsorption to the AuNPs. The SERS spectra are dominated by the portions of the molecule that dominate the charge transfer complex with the AuNPs. The significance of this in relation to the use of phenyldithioesters for molecular barcoding of nanoparticle assemblies is discussed.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||
Journal or Publication Title: | Langmuir | ||||
Publisher: | American Chemical Society | ||||
ISSN: | 0743-7463 | ||||
Official Date: | 2010 | ||||
Dates: |
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Volume: | Volume 26 | ||||
Number: | Number 2 | ||||
Page Range: | pp. 692-701 | ||||
DOI: | 10.1021/la9023162 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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