Adsorption Characteristics of 1,3-Propanedithiol on Gold:  Surface-Enhanced Raman Scattering and Ellipsometry Study

2000 ◽  
Vol 104 (26) ◽  
pp. 6218-6224 ◽  
Author(s):  
Sang Woo Joo ◽  
Sang Woo Han ◽  
Kwan Kim
Keyword(s):  
Raman Scattering ◽  
Gold Surface ◽  
Surface Enhanced Raman Scattering ◽  
Adsorption Characteristics ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Part III: Surface-Enhanced Raman Scattering of Amino Acids and Their Homodipeptide Monolayers Deposited onto Colloidal Gold Surface

2005 ◽  
Vol 59 (12) ◽  
pp. 1516-1526 ◽  
Author(s):  
Edyta Podstawka ◽  
Yukihiro Ozaki ◽  
Leonard M. Proniewicz
Keyword(s):  
Amino Acids ◽  
Raman Scattering ◽  
Colloidal Gold ◽  
Gold Surface ◽  
Surface Enhanced Raman Scattering ◽  
Competitive Interactions ◽  
Surface Geometry ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Surface-enhanced Raman scattering (SERS) spectra were measured for monolayers of various amino acids: L-methionine (Met), L-cysteine (Cys), L-glycine (Gly), L-leucine (Leu), L-phenylalanine (Phe), and L-proline (Pro) and their homodipeptides (Met-Met, Cys-Cys, Gly-Gly, Leu-Leu, Phe-Phe, and Pro-Pro) deposited onto a colloidal gold surface. Orientation of amino acids and their homodipeptides, as well as specific-competitive interactions of their functional groups with the gold surface, were predicted by detailed spectral analysis of the obtained SERS spectra. The analysis performed allowed us to propose a particular surface geometry for each amino acid and homodipeptide on the gold surface. In addition, we compared the structures of these molecules adsorbed on colloidal gold and silver surfaces.

Surface-Enhanced Raman Scattering of Aromatic Sulfides in Aqueous Gold Sol

2000 ◽  
Vol 54 (3) ◽  
pp. 378-383 ◽  
Author(s):  
Sang Woo Joo ◽  
Sang Woo Han ◽  
Kwan Kim
Keyword(s):  
Raman Scattering ◽  
Gold Surface ◽  
Surface Enhanced Raman Scattering ◽  
Silver Surface ◽  
Visible Radiation ◽  
Absorption Bands ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Gold Sol

A surface-enhanced Raman scattering (SERS) study has been performed for benzyl phenyl sulfide (BPS) and dibenzyl sulfide (DBS) in aqueous gold sol to examine the feasibility of the occurrence of surface-induced photoreactions of aromatic sulfides. Although BPS and DBS were reported to be decomposed into mercaptides on the silver surface by the 514.5 nm radiation, the molecules were found not to undergo such reactions on the gold surface. Such a difference in behavior was speculated to be associated with the different adsorption strength of BPS and DBS on gold and silver. The absorption bands of BPS and DBS seemed to be substantially broadened on silver so that the low-energy tails of the broadened absorption bands were in resonance with the 514.5 nm radiation, while the electronic absorption bands were not broadened sufficiently on the gold surface to absorb visible radiation.

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