Ag Through-void Arrays Prepared by Template Electrodeposition and Their Refractive Index Sensing Properties†

doi:10.7503/cjcu20150328

Abstract

Abstract:

One- and two-tier Ag through-void arrays for extraordinary optical transmission(EOT)-based plasmonic sensing were fabricated by electrodeposition of Ag through monolayer and bilayer colloidal crystal template of polystyrene spheres, followed by removal of the template. Experimental results reveal that compared with one-tier Ag through-void arrays, two-tier Ag through-void arrays show largely improved sensitivity and figure of merit(FOM), which reach 559.71 nm/RIU(RIU: Refractive index unit) and 14.28 RIU^-1, respectively. These suggests a low cost, feasible way for the fabrication of high quality EOT-based plasmonic sensor using routine techniques in which the tools used are accessible to most researchers.

Key words: Surface plasmon, Through-void array, Template electrodeposition, Self-assembly, Refractive index sensor

CLC Number:

O641

TrendMD:

XU Die, SHEN Xiaohua, LI Huanhuan, DU Yuanchun, HU Jiawen. Ag Through-void Arrays Prepared by Template Electrodeposition and Their Refractive Index Sensing Properties^†[J]. Chem. J. Chinese Universities, 2015, 36(12): 2511.

Figures/Tables 4

Fig.1 SEM images of one-(A) and two-tier(B) Ag through-void arrays made from monolayer and bilayer templates of 616 nm PS spheres, respectively

Fig.2 Transmission spectra(A, C) and plots of λQ and λD versus the refractive index(n)(B, D) of the surrounding medium for one-(A, B) and two-tier(C, D) Ag through-void arrays with a period of 616 nm a. In air(n=1); b. in ethanol(n =1.36); c. in chloroform(n=1.44). Regression equations for the plots shown in (B): λQ=26.36+559.71n, λD=388.37+ 444.17n; regression equations for the plots shown in (D): λQ=468.51+231.43n, λD=804.00+160.19n.

Table 1 Assessment of sensing performance of Ag through-void arrays with various periods

Array period/nm	Tier number	S/(nm·RIU^-1)	FOM/RIU^-1
275	One	78.88	0.35
275	Two	527.06	4.26
413	One	136.31	0.67
413	Two	649.39	8.28
616	One	231.43	1.78
616	Two	559.71	14.28

Fig.3 Transmission spectra(A, C) and plots of λQ and λD versus the refractive index(n)(B, D) of the surrounding medium for two-tier Ag through-void arrays with a period of 275 nm(A, B) and 413 nm(C, D) a. In air(n=1); b. in ethanol(n =1.36); c. in chloroform(n=1.44). Regression equation for the plot shown in (B): λD=62.95+ 527.06n; regression equations for the plots shown in (D): λQ=34.98 + 406.06n, λD=33.89 + 649.39n.

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