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Updated: Jul 19, 2026

A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates
Published on: May 9, 2014
Chain-length-dependent vibrational resonances in alkanethiol self-assembled monolayers observed on plasmonic
Carly S Levin1, Benjamin G Janesko, Rizia Bardhan
1Department of Chemistry and the Laboratory for Nanophotonics, Rice University, 6100 Main Street, Houston, Texas 77005, USA.
Abstract:
Alkanethiol self-assembled monolayers (SAMs) on gold exhibit a series of sharp resonances in their surface-enhanced Raman spectrum that depend dramatically on carbon chain length. This unusual behavior suggests a coupling of the gold-sulfur bond stretch with the longitudinal acoustic, "accordion", vibrations of the molecular alkane chain. A simple model of a one-dimensional chain attached to a surface quantitatively reproduces these previously unreported experimental observations in this important nanomaterial system.
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