Localized surface plasmons resonant sensor based on Ag nanoparticles

Abstract

Abstract:

Ag nanoparticles are prepared by microwave synthesizing method, and then are absorbed on the glass slide by self-assembling technology. Thus, the localized surface plasmons resonant (LSPR) sensor is developed. Uv-Vis absorption spectrum shows that its LSPR peak is located at 428nm in pure water. The LSPR peak takes red shift when the refractive index of surrounding solution increases, and the sensitivity can arrive at 173nm± 6nm/RIU. After annealing at 350oC, the shape of Ag nanoparticles on the glass slide is changed. The LSPR peak shifts about 65nm towards longer wavelength, the sensitivity decreases with 20%. Theoretical analysis indicates that shape and substrate take important effect on the response of wavelength and the sensitivity for the refractive index sensor of Ag nanoparticles.

Key words: optoelectronics, localized surface plasmons, Ag nanoparticles, self-assembly, refractive index sensor

XIE Zhi-Guo, LU Yong-Hua, YAN Jie, LIN Kai-Qun, TAO Jun, WANG Pei, MING Hai. Localized surface plasmons resonant sensor based on Ag nanoparticles[J]. J4, 2010, 27(1): 117-120.

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