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Surface Roughness‐dependent Photoelectron Emission Characteristics of Silver Probed by Surface‐enhanced Raman Scattering of 4‐Nitrobenzenethiol #
Author(s) -
Kim InHyun,
Shin Kuan Soo,
Kim Kwan
Publication year - 2015
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.10191
Subject(s) - foil method , raman scattering , surface roughness , x ray photoelectron spectroscopy , materials science , analytical chemistry (journal) , raman spectroscopy , field emission microscopy , etching (microfabrication) , surface finish , adsorption , photoelectric effect , field electron emission , scanning electron microscope , chemistry , optics , electron , nanotechnology , diffraction , optoelectronics , nuclear magnetic resonance , layer (electronics) , composite material , physics , chromatography , quantum mechanics
The surface roughness‐dependent photoelectron emission characteristics of silver were investigated through the surface‐enhanced Raman scattering ( SERS ) spectra of 4‐nitrobenzenethiol (4‐ NBT ) adsorbed on HNO 3 ‐etched Ag foils. The roughness of the etched Ag foil, examined by field emission scanning electron microscopy and atomic force microscopy, was found to be related to the SERS characteristics of 4‐ NBT . In fact, the 4‐ NBT molecules adsorbed on silver showed different SERS spectral patterns depending on the surface roughness of Ag. The symmetric stretching vibration of nitro group of 4‐ NBT gradually lost its intensity, and new peaks attributable to 4‐aminobenzenethiol appeared as the etching time of the Ag foil was increased, suggesting that photoelectrons could be transferred from silver to 4‐ NBT even by the irradiation of a visible laser, more easily upon the increase in the surface roughness.