Simple method for the preparation of surface-enhanced Raman-active gold films

Sandhyarani, N.; Murty, K. V. G. K.; Pradeep, Thalappil

doi:10.1002/(sici)1097-4555(199805)29:5<359::aid-jrs246>3.0.co;2-q

Cited by 11 publications

(13 citation statements)

References 5 publications

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“…The silver used for coating was of 99.9% purity. The films prepared this way have been shown to be excellent substrates for SERS work (19). The films show corrugations in the submicrometer scale in scanning electron microscopy.…”

Section: Methodsmentioning

confidence: 98%

Self-assembled Monolayers of Two Aromatic Disulfides and a Diselenide on Polycrystalline Silver Films: An Investigation by SERS and XPS

Venkataramanan

Skanth

Bandyopadhyay

et al. 1999

Journal of Colloid and Interface Science

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Self-assembled monolayers of diphenyldisufide (DDS), naphthalenedisulfide (NDS), and diphenyldiselenide (DDSe) on polycrystalline silver films have been investigated by surface enhanced Raman spectroscopy (SERS) and X-ray photoelectron spectroscopy (XPS). DDS adsorbs on Ag through a homolytic cleavage of the S-S bond and resultant thiolate at the surface decomposes upon prolonged exposure to air. The geometry of the molecule is such that the benzene ring is almost horizontal to the surface. The Raman spectrum has been assigned in the light of ab-initio molecular orbital calculations. In DDSe, the Se-Se bond is retained upon adsorption and the molecule sticks up. In contrast, NDS is highly reactive on the microscopically rough surface so that a stable monolayer could not be prepared. A temperature dependent Raman study of the DDS monolayer shows the absence of any reorientation at the surface as one would expect from the adsorption geometry. XPS study complements the SERS data and shows the presence of Ag 2 S on an NDS exposed surface.

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Section: Methodsmentioning

confidence: 98%

Self-assembled Monolayers of Two Aromatic Disulfides and a Diselenide on Polycrystalline Silver Films: An Investigation by SERS and XPS

Venkataramanan

Skanth

Bandyopadhyay

et al. 1999

Journal of Colloid and Interface Science

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“…Briefly, 1 mM solution of the respective surfactant in absolute ethanol was exposed to the Au film overnight. The preparation of SER active films has been discussed earlier (16). The methodology involves sputter coating Au of about 2000-Å thickness on an oxidized aluminum foil in an Edwards sputter coater.…”

Section: Methodsmentioning

confidence: 99%

“…Aluminum foil of 20-m thickness was heated in air at 773 K for 5 h to make an adequately thick oxide layer. Scanning electron microscopic (SEM) investigation of the evaporated films shows corrugations of submicrometer dimensions and is shown to be excellent substrates for SERS work (16). The films after withdrawal from the solution were washed with ethanol repeatedly and used for subsequent transformations.…”

Section: Methodsmentioning

confidence: 99%

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Ion/Surface Reactions at Monolayers in Solution: A Combined Surface Enhanced Raman–X-Ray Photoelectron Spectroscopic Investigation of the Chemical Modification of a 2-Mercaptobenzothiazole Monolayer on Polycrystalline Au Films

Sandhyarani

Pradeep

1999

Journal of Colloid and Interface Science

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Reaction of a methyltriphenylphosphonium (TPP) ion with a 2-mercaptobenzothiazole (MBT) monolayer on polycrystalline gold under electrochemical conditions leads to the chemical modification of the monolayer. Surface-enhanced Raman spectroscopy (SERS) has been used to study the molecular nature of the transformation. MBT, which adsorbs in the thione form on Au, gets transformed to the thiolate form upon reaction. Thermal stability of the modified monolayer is substantially lower than the corresponding pure monolayers and complete desorption of the modified monolayer occurs below 473 K. Time, potential, and solvent dependence of the reaction has been investigated. Electron transfer from the monolayer to the approaching ion in solution is suggested as the cause of the reaction. XPS investigation shows the change in the valence states of the species concerned. While the parent MBT gets oxidized, the TPP moiety gets reduced. The results suggest that modified monolayers can be made by simple electrochemical procedures and the processes are similar to the corresponding gas-phase events (1994, R. G. Cooks, T. Ast, T.

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“…There are many reports of SERS on nanostructured surfaces of coinage metals Au, Ag, and Cu. ,,− Other metals and metal oxides such as Li, Na, K, Pd, Pt, Cu 2 O, and TiO 2 have also been proven effective for SERS. ,,, The enhancement in the Raman signal can be due to various reasons, one of which is related to the surface plasmon effect due to the presence of nanostructures on the surface. The surface plasmon is the oscillation of conduction electrons on the nanostructures giving rise to an oscillating field that couples with the electric field of the laser light; thereby the electric field intensity increases as E 2 and the Raman scattered light originating from adsorbed molecules (on the nanostructured surface) is also enhanced by E 2 ; consequently the total signal increases as E 2 × E 2 = E 4 .…”

Section: Objective and Backgroundmentioning

confidence: 99%

Surface-Enhanced Raman Scattering on Chemically Etched Copper Surface: An Upper-Level Spectroscopic Measurement and Analysis

et al. 2019

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Raman spectroscopy is an important vibrational spectroscopy tool to characterize chemical compounds. As only a few photons undergo Raman scattering, enhancement of signal is a vital requirement. In this laboratory experiment, some practical aspects of Raman spectroscopy and how a simple enhancement procedure can be used to detect a Raman signal has been described. An acid etching procedure has been used to create a surface-enhanced Raman scattering (SERS) substrate, and its effectiveness has been demonstrated with successful detection of the parts per million level of methylene blue. This work is relevant to upper-level undergraduate or graduate-level laboratory course preparation as the procedure is simple enough to be easily reproducible in a typical chemistry laboratory.

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Simple method for the preparation of surface-enhanced Raman-active gold films

Cited by 11 publications

References 5 publications

Self-assembled Monolayers of Two Aromatic Disulfides and a Diselenide on Polycrystalline Silver Films: An Investigation by SERS and XPS

Self-assembled Monolayers of Two Aromatic Disulfides and a Diselenide on Polycrystalline Silver Films: An Investigation by SERS and XPS

Ion/Surface Reactions at Monolayers in Solution: A Combined Surface Enhanced Raman–X-Ray Photoelectron Spectroscopic Investigation of the Chemical Modification of a 2-Mercaptobenzothiazole Monolayer on Polycrystalline Au Films

Surface-Enhanced Raman Scattering on Chemically Etched Copper Surface: An Upper-Level Spectroscopic Measurement and Analysis

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