LSPR optical fibre sensors based on hollow gold nanostructures
LSPR optical fibre sensors based on hollow gold nanostructures
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DOI：
10.1016/j.snb.2013.09.094
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发表时间：
2014-02-01
影响因子：
8.4
通讯作者：
Grattan, K. T. V.
中科院分区：
文献类型：
--
作者：
Tu, M. H.;Sun, T.;Grattan, K. T. V.
与固体金纳米颗粒（AuNPs）相比，空心金纳米颗粒因其具有更强的等离子体效应而受到越来越多的关注。结合使用光纤技术的已知优势，本研究开发了一种便携式、可靠和高灵敏度的传感器系统，并对各种潜在的传感应用进行了评估。在这项工作中，设计和合成了中空金纳米笼，专门用于开发基于lspr的光纤传感器，在这种情况下用于折射率（RI）测量。在此过程中，我们合成并表征了不同的纳米金空心结构，实验结果表明，基于空心纳米结构的LSPR传感器对已知RI变化的灵敏度与金纳米笼的中空度密切相关。结果表明，随着纳米笼壁厚的减小，LSPR传感器的灵敏度显著提高，这是由于内外场之间存在强烈的等离子体耦合。与作者先前报道的基于固体纳米颗粒的LSPR传感器相比，本研究中基于纳米笼的传感器显示出1933 nm/RIU的优异灵敏度，因此灵敏度比先前的工作至少提高了3倍。(C) 2013 Elsevier B.V.版权所有
Compared to solid gold nanoparticles (AuNPs) which have been widely used for the construction of localized surface plasmon resonance (LSPR) sensors, hollow gold nanoparticles have attracted greater attention recently due to the stronger plasmonic effect that they demonstrate. Combining this with the known advantages of the use of fibre optic technology, a portable, reliable and highly sensitive sensor system has been developed and reported in this study and evaluated for various potential sensing applications. In this work, hollow gold nanocages have been designed and the synthesized specifically for the development of a LSPR-based optical fibre sensor, in this case for Refractive Index (RI) measurement. In doing so, different hollow structures of nanogold have been synthesized and characterized and the experimental results obtained show that the sensitivity of the hollow nanostructure-based LSPR sensor, in response to known RI variations, is closely related to the hollowness of the gold nanocages. It was observed that with the decrease of the wall thickness of the nanocages, the sensitivity of the LSPR sensor created increases dramatically and this is due to the strong plasmonic coupling seen between the interior and exterior fields. Compared to the LSPR sensors based on solid-nanoparticles reported earlier by the authors, the nanocage-based sensor created in this work has demonstrated an excellent sensitivity of 1933 nm/RIU, thus showing a significant improvement of at least 3 fold in sensitivity from that prior work. (C) 2013 Elsevier B.V. All rights reserved.