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Engineering surface strain for site-selective island growth of Au on anisotropic Au nanostructures

查看全文 作　　者：Fan [1]Yang;Ji [1]Feng;Jinxing [1,3]Chen;Zuyang [1]Ye;Jihua [2]Chen;Dale [2]KHensley;Yadong [1]Yin 高影响力作者 机构地区：[1]Department of Chemistry,University of California,Riverside,California 92521,USA;[2]Center for Nanophase Materials Sciences,Oak Ridge National Laboratory,Oak Ridge,Tennessee 37831-6494,USA;[3]Institute of Functional Nano&Soft Materials,Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices,Soochow University,Suzhou 215123,China高影响力机构 出　　处：《Nano Research》索引2023年第16卷第4期,共7页高影响力期刊 基　　金：supported by the US National Science Foundation(CHE-1808788). 摘　　要：Controlled growth of islands on plasmonic metal nanoparticles represents a novel strategy in creating unique morphologies that are difficult to achieve by conventional colloidal synthesis processes,where the nanoparticle morphologies are typically determined by the preferential development of certain crystal facets.This work exploits an effective surface-engineering strategy for site-selective island growth of Au on anisotropic Au nanostructures.Selective ligand modification is first employed to direct the site-selective deposition of a thin transition layer of a secondary metal,e.g.,Pd,which has a considerable lattice mismatch with Au.The selective deposition of Pd on the original seeds produces a high contrast in the surface strain that guides the subsequent site-selective growth of Au islands.This strategy proves effective in not only inducing the island growth of Au on Au nanostructures but also manipulating the location of grown islands.By taking advantage of the iodide-assisted oxidative ripening process and the surface strain profile on Au nanostructures,we further demonstrate the precise control of the islands’number,coverage,and wetting degree,allowing fine-tuning of nanoparticles’optical properties. 关 键 词：PLASMONIC Au nanorods island growth seed-mediated growth site-selective
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