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Open AccessArticle

Effect of Surface Coverage of Gold Nanoparticles on the Refractive Index Sensitivity in Fiber-Optic Nanoplasmonic Sensing

1
Department of Biomechatronics Engineering, National Pingtung University of Science and Technology, Pingtung 912, Taiwan
2
Department of Chemistry and Biochemistry and Center for Nano Bio-Detection, National Chung Cheng University, Chiayi 621, Taiwan
*
Authors to whom correspondence should be addressed.
Sensors 2018, 18(6), 1759; https://doi.org/10.3390/s18061759
Received: 3 May 2018 / Revised: 24 May 2018 / Accepted: 25 May 2018 / Published: 31 May 2018
(This article belongs to the Special Issue Optical Chemical Nanosensors)
A simple theoretical model was developed to analyze the extinction spectrum of gold nanoparticles (AuNPs) on the fiber core and glass surfaces in order to aid the determination of the surface coverage and surface distribution of the AuNPs on the fiber core surface for sensitivity optimization of the fiber optic particle plasmon resonance (FOPPR) sensor. The extinction spectrum of AuNPs comprises of the interband absorption of AuNPs, non-interacting plasmon resonance (PR) band due to isolated AuNPs, and coupled PR band of interacting AuNPs. When the surface coverage is smaller than 12.2%, the plasmon coupling effect can almost be ignored. This method is also applied to understand the refractive index sensitivity of the FOPPR sensor with respect to the non-interacting PR band and the coupled PR band. In terms of wavelength sensitivity at a surface coverage of 18.6%, the refractive index sensitivity of the coupled PR band (205.5 nm/RIU) is greater than that of the non-interacting PR band (349.1 nm/RIU). In terms of extinction sensitivity, refractive index sensitivity of the coupled PR band (−3.86/RIU) is similar to that of the non-interacting PR band (−3.93/RIU). Both maximum wavelength and extinction sensitivities were found at a surface coverage of 15.2%. View Full-Text
Keywords: particles plasmon resonance; extinction spectrum; gold nanoparticle particles plasmon resonance; extinction spectrum; gold nanoparticle
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MDPI and ACS Style

Wu, W.-T.; Chen, C.-H.; Chiang, C.-Y.; Chau, L.-K. Effect of Surface Coverage of Gold Nanoparticles on the Refractive Index Sensitivity in Fiber-Optic Nanoplasmonic Sensing. Sensors 2018, 18, 1759.

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