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Materials 2015, 8(5), 2688-2699; doi:10.3390/ma8052688

Effect of Refractive Index of Substrate on Fabrication and Optical Properties of Hybrid Au-Ag Triangular Nanoparticle Arrays

1
School of Information Engineering, Jimei University, Xiamen 361021, China
2
China–Australia Joint Laboratory for Functional Nanomaterials, Xiamen University, Xiamen 361005, China
3
Department of Physics, National University of Singapore, Singapore 117551, Singapore
4
Department of Chemical and Materials Engineering, National University of Kaohsiung, No. 700, Kaohsiung University Rd., Nan-Tzu District, Kaohsiung 811, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Teen-Hang Meen
Received: 31 March 2015 / Revised: 3 May 2015 / Accepted: 8 May 2015 / Published: 19 May 2015
(This article belongs to the Special Issue Selected Papers from ICASI 2015)
View Full-Text   |   Download PDF [1533 KB, uploaded 19 May 2015]   |  

Abstract

In this study, the nanosphere lithography (NSL) method was used to fabricate hybrid Au-Ag triangular periodic nanoparticle arrays. The Au-Ag triangular periodic arrays were grown on different substrates, and the effect of the refractive index of substrates on fabrication and optical properties was systematically investigated. At first, the optical spectrum was simulated by the discrete dipole approximation (DDA) numerical method as a function of refractive indexes of substrates and mediums. Simulation results showed that as the substrates had the refractive indexes of 1.43 (quartz) and 1.68 (SF5 glass), the nanoparticle arrays would have better refractive index sensitivity (RIS) and figure of merit (FOM). Simulation results also showed that the peak wavelength of the extinction spectra had a red shift when the medium’s refractive index n increased. The experimental results also demonstrated that when refractive indexes of substrates were 1.43 and 1.68, the nanoparticle arrays and substrate had better adhesive ability. Meanwhile, we found the nanoparticles formed a large-scale monolayer array with the hexagonally close-packed structure. Finally, the hybrid Au-Ag triangular nanoparticle arrays were fabricated on quartz and SF5 glass substrates and their experiment extinction spectra were compared with the simulated results. View Full-Text
Keywords: discrete dipole approximation (DDA); nanosphere lithography (NSL); hybrid Au-Ag nanoparticles; substrate refractive index discrete dipole approximation (DDA); nanosphere lithography (NSL); hybrid Au-Ag nanoparticles; substrate refractive index
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Liu, J.; Chen, Y.; Cai, H.; Chen, X.; Li, C.; Yang, C.-F. Effect of Refractive Index of Substrate on Fabrication and Optical Properties of Hybrid Au-Ag Triangular Nanoparticle Arrays. Materials 2015, 8, 2688-2699.

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