Molecular conformation changes in alkylthiols ligands as afunction of size in gold nanoparticles

Ramallo-Lopez, J. M.; Giovanetti, L. J.; Requejo, F. G.; Isaacs, S. R.; Shon, Y. S.; Salmeron, M.

doi:10.1103/PhysRevB.74.073410

Molecular conformation changes in alkylthiols ligands as afunction of size in gold nanoparticles

Journal Article · Mon Jan 09 04:00:00 EST 2006 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.74.073410· OSTI ID:919934

Ramallo-Lopez, J. M.; Giovanetti, L. J.; Requejo, F. G.; Isaacs, S. R.; Shon, Y. S.; Salmeron, M.

The bonding of hexanethiols to gold nanoparticles of 1.5, 2.0 and 3 nm was studied using X-ray Absorption Near Edge Spectroscopy (XANES) and Extended X-ray Absorption Fine Structure (EXAFS). The XANES spectra revealed that a substantial fraction of hexanethiol molecules were weakly bound, in addition to the molecules forming covalent bonds with Au surface atoms. The weakly bound molecules could be easily removed by washing in dichloromethane. After removal of the weakly bound molecules the S K-edge XANES spectrum reveals peaks due to S-Au and S-C bonds with intensities that change as a function of particle size. We explain this as the result of distortions occurring in the molecules adsorbed on the smaller particles. The distortions arise from the poor packing due to the high curvature of the particles. In addition, EXAFS results show that the smaller particles bind more molecules per Au atom than the larger ones, which is again interpreted as a result of the curved nature of the surface.

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Research Organization:: COLLABORATION - U. Nacional de La Plata andIFLP-INIFTA

Sponsoring Organization:: USDOE

DOE Contract Number:: AC02-05CH11231

OSTI ID:: 919934

Report Number(s):: LBNL--59306; BnR: KC0203010

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 7 Vol. 74; ISSN PRBMDO; ISSN 0163-1829

Country of Publication:: United States

Language:: English

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Molecular conformation changes in alkylthiols ligands as afunction of size in gold nanoparticles

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