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Structure of 4‐biphenylthiolate on Au nanoparticle surfaces studied by UV‐Vis absorption spectroscopy, transmission electron microscopy and surface‐enhanced Raman scattering
Author(s) -
Jang Soonmin,
Kim Sung II,
Shin Seokmin,
Joo SangWoo
Publication year - 2004
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.1647
Subject(s) - raman spectroscopy , transmission electron microscopy , absorption (acoustics) , spectroscopy , chemistry , raman scattering , dihedral angle , nanoparticle , absorption spectroscopy , absorption band , analytical chemistry (journal) , materials science , crystallography , optics , nanotechnology , molecule , physics , hydrogen bond , organic chemistry , chromatography , quantum mechanics , composite material
Structure of 4‐biphenylthiolate on Au nanoparticle surfaces has been studied by UV‐Vis absorption spectroscopy, transmission electron microscopy and surface‐enhanced Raman scattering (SERS). 4‐Biphenylthiolate is found to have a standing geometry on Au from the presence of the benzene ring CH stretching band identified at ∼3060 cm −1 . The ν 8a band at 1597 cm −1 in the ordinary Raman spectrum was found to split clearly into two features at 1599 and 1585 cm −1 . This result suggests that orientation of the phenyl rings in 4‐biphenylthiolate may be quite different and should not lie in the same plane on Au nanoparticle surfaces. On the basis of the electromagnetic enhancement factor, the dihedral angle could be estimated with a reported value of the tilt angle. Copyright © 2004 John Wiley & Sons, Ltd.