Gold nanobipyramid enveloped in alloyed nanoshell for stable plasmonic sensors
纳米壳
等离子体子
纳米技术
材料科学
光电子学
作者
Xiu Wang,Caixia Kan,Juan Xu,Xingzhong Zhu,Mingming Jiang,Yuan Ni
出处
期刊:Journal of Physics D [IOP Publishing] 日期:2020-05-20卷期号:53 (29): 295303-295303被引量:4
标识
DOI:10.1088/1361-6463/ab86e4
摘要
Compared to monometallic nanoparticles, alloyed and bimetallic nanostructures are of great interest for their high stability and improved physicochemical properties. In this work, an effective method has been developed to obtain core–shell nanorods, in which the core is uniform gold nanobipyramids (AuBPs) enveloped in AuxAg1-x alloyed nanoshell. The penta-twinned AuBP@AuxAg1-x nanorods with x ranging from 0 to 1 integrate the advantages of AuBPs core and AuAg alloy shell effectively. Specifically, they combine the superiority of Au and Ag, exhibiting excellent both thermal and chemical stability, high refractive index sensitivity, and stable surface-enhanced Raman scattering effect in harsh environment. Furthermore, the surface plasmon resonance of AuBP@AuxAg1-xNRs could be finely tailored in a large wavelength region with a narrow full width at half maximum by simply varying the alloy shell thickness and the AuBPs core size. These improved properties offer the obtained core–shell nanostructures novel and viable perspectives in severe environments. The simple and feasible synthetic strategy is also versatile to fabricate other noble metallic nanostructures enveloped in alloyed nanoshell.