Spectroscopic identification of S-Au interaction in cysteine capped gold nanoparticles

Spectroscopic identification of S-Au interaction in cysteine capped gold nanoparticles

This study deals with the synthesis of cysteine capped gold nanoparticles with an average size of 12 nm by borohydride reduction and spectroscopic identification of SAu interaction. We have studied the interaction of thiol with gold nanoparticles in aqueous medium by employing UV-vis, Raman, NMR, an...

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Bibliographic Details
Published in:Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Vol. 63; no. 1; pp. 160 - 163
Main Authors: Aryal, Santosh, B K C, Remant, Dharmaraj, N, Bhattarai, Narayan, Kim, Chi Hun, Kim, Hak Yong
Format: Journal Article
Language:English
Published: England 01-01-2006
Subjects:
Cysteine - chemistry
Gold - chemistry
Microscopy, Electron, Transmission
Nanostructures - chemistry
Spectrophotometry, Ultraviolet
Spectroscopy, Fourier Transform Infrared
Spectrum Analysis, Raman
Sulfur - chemistry
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Summary:This study deals with the synthesis of cysteine capped gold nanoparticles with an average size of 12 nm by borohydride reduction and spectroscopic identification of SAu interaction. We have studied the interaction of thiol with gold nanoparticles in aqueous medium by employing UV-vis, Raman, NMR, and FT-IR spectroscopy. The shifting of gold plasmon resonance in the UV-vis spectra shows the stabilization of gold nanoparticles by cysteine. The disappearance of S-H stretching in both the IR and Raman spectra and the shifting of the NMR signals of the protons in close proximity to the metal center supported the existence of the S-Au interaction in cysteine capped gold nanoparticles. The TEM images shows cysteine capped gold nanoparticles as distinct and spherical entities as compared to free colloidal gold nanoparticles.
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ISSN:1386-1425
DOI:10.1016/j.saa.2005.04.048