Modulation of the Localized Surface Plasmon Resonance Optical Property of Monodisperse Gold Nanorods with Silver Shells

KeyWord:gold nanorod  silver shell  localized surface plasmon resonance(LSPR) optical property  longitudinal LSPR wavelength  visualization sensor

Abstract:

      In order to tune the longitudinal localized surface plasmon resonance(LSPR) wavelength of monodisperse gold nanorods from near infrared to visible light region,monodisperse bimetallic nanorods£¬ with core shell structure based on silver as shell(Au@AgNRs),were synthesized by in situ reduction reaction,and their silver shell thickness could be modulated by the used amount of AgNO3.The morphology,monodispersity and chemical composition of Au@AgNRs were identified by high resolution transmission electron microscopy and X-ray energy dispersive spectroscopy.With the increase of their silver shell thickness,the LSPR effect of Au@AgNRsis was gradually enhanced,and their longitudinal LSPR peak was blue shifted from near infrared to visible light region.When the silver shell thickness was increased 1 nm,the longitudinal LSPR wavelength was decreased about 12 nm.The prepared Au@AgNRs has a good application prospect in visualization sensor.