Influence of aspect ratio on refractive index sensitivity of gold nanorod

Abstract

Abstract:

Gold nanorods with multiple aspect ratios were prepared using seeded growth method. The refractive index sensitivity of the nanorods was studied by monitoring the shift of localized surface plasmon resonance peak when the surrounding refractive index was changed. The experiment results show that sensitivity increases almost linearly with aspect ratio. It varies from 216nm/RIU (aspect ratio 2.5:1) to 352nm/RIU (aspect ratio 4.2:1) in the monitored wavelength range. Discrete dipole approximation (DDA) is performed to simulate the sensitivity of nanorod with aspect ratio 4.2:1, which is in accordance with the experiment results.

Key words: spectroscopy, localized surface plasmon resonance, refractive index sensor, gold nanorods, aspect ratio

CLC Number:

TP212.1

TAO Jun, LU Yonghua, CHEN Chunchong, WANG Pei, MING Hai . Influence of aspect ratio on refractive index sensitivity of gold nanorod[J]. J4, 2012, 29(1): 101-105.

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Influence of aspect ratio on refractive index sensitivity of gold nanorod

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