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Surface-Enhanced Raman Spectroscopy from Colloids at High Pressures

Published online by Cambridge University Press:  15 February 2011

Michael Bradley ,
John Krech  and
Shlomo Efrima
Michael Bradley
Affiliation:
Department of Chemistry, University of Connecticut, Storrs, CT 06269-3060
John Krech
Affiliation:
Department of Chemistry, University of Connecticut, Storrs, CT 06269-3060
Shlomo Efrima
Affiliation:
Department of Chemistry, Ben Gurion University of the Negev, Be'er Sheva, Israel.
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Abstract

High pressure surface enhanced Raman (SERS) spectra are reported for a highly dense silver colloidal suspension, termed a MEtal Liquid-Like Film or MELLF. Comparison is made with the SERS spectrum of a dilute organosol. Raman signals due to adsorbed molecules and the solvent dichloromethane reveal appreciable frequency shifts as the colloidal environment is influenced by temperature, pressure, and packing. The C-Cl stretch of neat dichloromethane near 705 cm−1 shifts 1.7 cm −1 blue in a MELLF. Raman signals due to the adsorbed anisic acid in MELLFs blue shift about 2 cm −1 as 4 kilobars of pressure are applied; the solvent peaks shift blue only about 1 cm −1. Temperature influences the MELLF in two ways: desorption of anisic acid and formation of agglomerated particles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 289: Symposium M – Flow and Microstructure of Dense Suspensions , 1992 , 227
Copyright
Copyright © Materials Research Society 1993

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