Interactions of Phenyldithioesters with Gold Nanoparticles (AuNPs): Implications for AuNP Functionalization and Molecular Barcoding of AuNP Assemblies
| Autor: | Tara L. Schiller, Peter M. Fredericks, Idriss Blakey, Zul Merican |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Magnetic Resonance Spectroscopy
Molecular Structure Chemistry Analytical chemistry Metal Nanoparticles Nanoparticle Esters Surfaces and Interfaces Surface Plasmon Resonance Surface-enhanced Raman spectroscopy Spectrum Analysis Raman Condensed Matter Physics Photochemistry Charge-transfer complex Adsorption Colloidal gold Electrochemistry Nanotechnology Molecule Surface modification General Materials Science Gold Surface plasmon resonance Spectroscopy |
| Zdroj: | Langmuir. 26:692-701 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/la9023162 |
| Popis: | 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, K(ads), was 2.3 +/- 0.1 x 10(6) 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. |
| Databáze: | OpenAIRE |
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