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.%为将单分散金纳米棒的纵向局域表面等离子体共振(LSPR)波长从近红外光区调节到可见光区,通过表面原位还原反应合成了以银为壳层的单分散双金属核壳复合纳米棒(Au@AgNRs),其Ag壳层厚度可由AgNO3的用量进行调节.用高分辨透射电镜和X射线能量色散谱仪确证了Au@AgNRs的形态结构、单分散性和化学组成.随着Ag壳层厚度的增加,Au@AgNRs的LSPR效应逐渐增强,纵向LSPR吸收峰由近红外光区蓝移到可见光区.Ag壳层厚度每增加1 nm,Au@AgNRs的纵向LSPR波长减小约12 nm.制得的Au@Ag-NRs在可视化传感器上有良好的应用前景.
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