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Related Experiment Video

Updated: Mar 8, 2026

A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates

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Published on: May 9, 2014

Electrically Modulated Localized Surface Plasmon around Self-Assembled-Monolayer-Covered Nanoparticles.

Liyuan Ma^1,2, Shandong Xu³, Chaoming Wang^4,5

¹School of Ophthalmology and Optometry, Eye Hospital, School of Biomedical Engineering, Wenzhou Medical University , Wenzhou, Zhejiang 325001, China.

Langmuir : the ACS Journal of Surfaces and Colloids

|January 24, 2017

Summary

Researchers observed electrical modulation of plasmon resonance in gold nanoparticles, leading to a new technique called dynamic electro-optical spectroscopy (DEOS). This method shows a significant, fast, and reversible shift in plasmon response due to water molecule reorientation.

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Area of Science:

Nanotechnology
Spectroscopy
Surface Chemistry

Background:

Localized surface plasmons (LSPs) on nanoparticles are sensitive to their local dielectric environment.
Electrical modulation of LSPs offers potential for novel optical devices.
Previous studies showed limited electrical modulation of plasmon responses.

Purpose of the Study:

To investigate the electrical modulation of localized surface plasmon resonance (LSPR) around self-assembled monolayer (SAM)-modified gold nanoparticles.
To establish a new spectroscopy technique, dynamic electro-optical spectroscopy (DEOS).
To understand the mechanism behind the observed electrical modulation.

Main Methods:

Fabrication of gold nanoparticles on a transparent conductive substrate.
Application of electrical bias to the substrate.
Measurement of LSPR shifts using spectroscopy.
Analysis of frequency-dependent peak shifts.

Main Results:

Observed significant electrical modulation of LSPR with a peak shift approximately ten times larger than previously reported.
Demonstrated that the direction of the peak shift depends on the polarity of the applied bias.
Identified an energy barrier for water molecule reorientation from oxygen-down to oxygen-up.
Showed that the reorientation process is fast and reversible.

Conclusions:

The significant LSPR shift is attributed to the reorientation of adsorbed water molecules, altering the local dielectric environment.
Dynamic electro-optical spectroscopy (DEOS) is a viable technique for studying fast, reversible dynamic processes at the nanoscale.
The findings open avenues for advanced electro-optical devices and sensing applications.