Date:

2025-04-30

Title of Paper:

Improve the refractive index sensitivity of gold nanotube by reducing the restoring force of localized surface plasmon resonance

Journal:

Sensors and Actuators B: Chemical

Summary:

a b s t r a c t
The core refractive index sensitivity of a gold nanotube was investigated by calculating the shift of local
surface plasmon resonance (LSPR). It was found that the core refractive index sensitivity can be improved
by reducing the wall thickness or the surrounding refractive index. The sensitivity increases exponentially
with decreasing wall thickness, but increases linearly with decreasing surrounding refractive index.
This multi-factor controlled sensitivity of gold nanotube enlarges the ability of optimizing the refractive
index sensors. The physical origin of this tunable refractive index sensitivity of gold nanotube was also
investigated based on the plasmon hybridization and repulsive effects on the restoring force of plasmon
oscillation. This physical mechanism can be used for designing core–shell metallic nanostructures for
effective LSPR chemical and biological sensing.
© 2011 Elsevier B.V. All rights reserved

Co-author:

Jian Zhu, Xing-chun Deng

Volume:

155

Page Number:

843–847

Translation or Not:

No

Date of Publication:

2011-07-01