Electrically Modulated Localized Surface Plasmon Around Self-Assembled-Monolayer-Covered Nanoparticles

Abstract

This article reports the observation of electrical modulation of localized surface plasmon around self-assembled monolayer (SAM)-modified gold nanoparticles and the establishment of a new spectroscopy technique, that is, dynamic electro-optical spectroscopy (DEOS). The gold nanoparticles are deposited onto a transparent conductive substrate, and an electrical bias applied on the conductive substrate can cause shift of resonance plasmon response, where the direction of peak shift is related to the polarity of applied bias. The peak shift observed at 2.4 V is approximately ten times larger than those reported in previous work. It is postulated that significant peak shift is the result of reorientation of adsorbed water on electrode, which can change local dielectric environment of nanoparticles. An energy barrier is identified when adsorbed water molecules are turned from oxygen-down to oxygen-up. Frequency-dependent peak shifts on surface-modified gold nanoparticles show that reorientation is a fast reversible process with rich dynamics.

Publication Date

2-14-2017

Publication Title

Langmuir

Volume

33

Issue

6

Number of Pages

1437-1441

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1021/acs.langmuir.6b03537

Socpus ID

85012929191 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85012929191

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