长径比对金纳米棒折射率传感灵敏度的影响

J4 ›› 2012, Vol. 29 ›› Issue (1): 101-105.

长径比对金纳米棒折射率传感灵敏度的影响

陶俊,鲁拥华,陈春翀,王沛,明海

中国科学技术大学光学与光学工程系, 安徽省光电子科学与技术重点实验室, 安徽合肥 230026

收稿日期:2011-02-28 修回日期:2011-03-24 出版日期:2012-01-28 发布日期:2012-01-28
通讯作者: 明海（1947- ），教授，博士生导师，研究方向为光电子技术，近场光学，光纤通信与器件。 E-mail:minghai@.ustc.edu.cn
作者简介:陶俊（1984- ），博士生，主要研究方向为金属纳米颗粒的光学性质及应用。E-mail: taojun@mail.ustc.edu.cn
基金资助:
国家重点基础研究发展规划项目（2011cb301802）、国家自然科学基金重点项目（60736037）、中央高校基本科研业务费专项资金资助

Influence of aspect ratio on refractive index sensitivity of gold nanorod

TAO Jun, LU Yonghua, CHEN Chunchong, WANG Pei, MING Hai

Department of Optics and Optical Engineering, University of Science and Technology of China, Anhui Key Laboratory of Optoelectronic Science and Technology, Hefei 230026, China

Received:2011-02-28 Revised:2011-03-24 Published:2012-01-28 Online:2012-01-28

摘要/Abstract

摘要：

利用化学种子生长法制备了多种长径比的金纳米棒，通过监测不同折射率下金纳米棒的局域表面等离子体共振(LSPR)波长移动来研究其折射率传感的灵敏度。实验结果表明，随着纳米棒长径比增加，其折射率传感的灵敏度近似线性地提高。在监测波长范围内，灵敏度从长径比为2.5：1时的216nm/RIU增长至4.2：1时的352nm/RIU。对于长径比为4.2:1的金纳米棒，用离散偶极子近似(DDA)的方法模拟了其折射率传感的灵敏度，与实验结果基本一致。

关键词: 光谱学, 局域表面等离子体共振, 折射率传感, 金纳米棒, 长径比

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

中图分类号:

TP212.1

陶俊鲁拥华陈春翀王沛明海. 长径比对金纳米棒折射率传感灵敏度的影响[J]. J4, 2012, 29(1): 101-105.

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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