文献类型：期刊文献

英文题名：Surfactant-free Synthesis of Spiky Hollow Ag-Au Nanostars with Chemically Exposed Surfaces for Enhanced Catalysis and Single-Particle SERS

作者：Ye, Ziwei[1,2,3];Li, Chunchun[4];Celentano, Maurizio[4];Lindley, Matthew[5];O'Reilly, Tamsin[4];Greer, Adam J.[6];Huang, Yiming[4];Hardacre, Christopher[6];Haigh, Sarah J.[5];Xu, Yikai[1];Bell, Steven E. J.[1]

机构：[1]Queens Univ Belfast, Sch Chem & Chem Engn, Belfast BT9 5AG, Antrim, North Ireland;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Inst Fine Chem, Key Lab Adv Mat, 130 Meilong Rd, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Sch Chem & Mol Engn, Inst Fine Chem, Feringa Nobel Prize Scientist Joint Res Ctr, 130 Meilong Rd, Shanghai 200237, Peoples R China;[4]Queens Univ Belfast, Sch Chem & Chem Engn, Belfast BT9 SAG, Antrim, North Ireland;[5]Univ Manchester, Dept Mat, Manchester M13 9PL, Lancs, England;[6]Univ Manchester, Dept Chem Engn & Analyt Sci, Manchester M13 9PL, Lancs, England

年份：2022

卷号：2

期号：1

起止页码：178

外文期刊名：JACS AU

收录：EI(收录号：20225113258990);WOS:【ESCI(收录号:WOS:000733808600001)】；

基金：Z.Y., C.L., Y.X., and S.E.J.B. acknowledge the University Special Research Scholarship (Q. U.B.) for support. Y.X. acknowledges The Leverhulme Trust Early Career Fellowship (grant ECF2020703) and the Royal Society of Chemistry Researcher Mobility Grant for financial support. M.C. and S.E.J.B. acknowledge the EPSRC grant EP/P034063/1 for support. C.H. and A.J.G. acknowledge support from the UK Catalysis Hub, funded by EPSRC grant EP/R027129/1. S.J.H. and M.L. acknowledge funding from the EPSRC (UK) (grants EP/M010619/1, EP/S021531/1, EP/P009050/1) and the European Commission H2020 ERC Starter grant EvoluTEM (715502). This work was supported by the Henry Royce Institute for Advanced Materials, funded through EPSRC grants EP/R00661X/1, EP/S019367/1, EP/P025021/1, and EP/P025498/1.

语种：英文

外文关键词：spiky hollow Au-Ag nanostar; surfactant molecule; surface-enhanced Raman spectroscopy; hydroxyethyl cellulose; self-assembly

摘要：Spiky/hollow metal nanoparticles have applications across a broad range of fields. However, the current bottom-up methods for producing spiky/hollow metal nanoparticles rely heavily on the use of strongly adsorbing surfactant molecules, which is undesirable because these passivate the product particles' surfaces. Here we report a high-yield surfactant-free synthesis of spiky hollow Au-Ag nanostars (SHAANs). Each SHAAN is composed of >50 spikes attached to a hollow ca. 150 nm diameter cubic core, which makes SHAANs highly plasmonically and catalytically active. Moreover, the surfaces of SHAANs are chemically exposed, which gives them significantly enhanced functionality compared with their surfactant-capped counterparts, as demonstrated in surface-enhanced Raman spectroscopy (SERS) and catalysis. The chemical accessibility of the pristine SHAANs also allows the use of hydroxyethyl cellulose as a weakly bound stabilizing agent. This produces colloidal SHAANs that remain stable for >1 month while retaining the functionalities of the pristine particles and allows even single-particle SERS to be realized.