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Plasmonic and sensing properties of vertically oriented hexagonal gold nanoplates
Hang Yin1, Yanzhen Guo, Ximin Cui
1Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China. jfwang@phy.cuhk.edu.hk.
Nanoscale
|July 31, 2018
Summary
Vertically oriented gold nanoplates enhance ultrasensitive plasmonic sensing by allowing more molecules to interact with their sharp tips. These vertically aligned nanoplates show improved sensitivity for detecting molecular binding compared to horizontal ones.
Area of Science:
- Nanotechnology
- Plasmonics
- Biosensing
Background:
- Plasmonic metal nanocrystals detect molecular binding via dielectric changes.
- Anisotropic gold nanoplates offer high refractive index sensitivity at their tips and edges.
- Single-particle level detection is a key challenge in localized plasmon resonance sensing.
Purpose of the Study:
- To investigate the plasmonic and sensing properties of vertically oriented hexagonal gold nanoplates.
- To compare the performance of vertically aligned versus horizontally oriented gold nanoplates.
- To explore the potential of vertically oriented nanoplates for ultrasensitive plasmonic sensors.
Main Methods:
- Deposition of vertically oriented hexagonal gold nanoplates on substrates.
- Experimental and numerical simulation-based comparison of vertical and horizontal nanoplates.
- Scattering measurements of gold nanoplates before and after perturbation, and upon polyelectrolyte adsorption.
Main Results:
- Vertically oriented nanoplates exhibit shorter plasmon resonance wavelengths and narrower peak widths than horizontal ones.
- Perturbation experiments confirm the shorter wavelengths and smaller peak widths for vertical nanoplates.
- Vertical gold nanoplates demonstrate higher sensitivity to polyelectrolyte adsorption compared to horizontal nanoplates.
Conclusions:
- Vertically oriented gold nanoplates are superior candidates for ultrasensitive plasmonic sensors.
- The orientation of gold nanoplates significantly impacts their plasmonic and sensing performance.
- This study advances the development of single-particle level molecular detection technologies.
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