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Weakening Circular Dichroism of Plasmonic Nanospirals Induced by Surface Grafting with Alkyl Ligands.

Small (Weinheim an der Bergstrasse, Germany) (2016-11-03)
Wai-Fung Lau, Lin Yang, Fan Bai, Zhifeng Huang
ABSTRACT

Silver nanospirals with strong chiroptical activity (characterized by circular dichroism) are grafted with achiral alkyl ligands, resulting in a weakening of the chiroptical activity. The chiroptical weakening is exacerbated with increasing bond energy of the Ag-ligand contacts, which is ascribed to the effective medium screening effect and electron withdrawal toward the alkyl ligands.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Octylamine, 99%
Sigma-Aldrich
1-Octanethiol, ≥98.5%
Sigma-Aldrich
Nonanoic acid, ≥97%