肺表面活性物质
材料科学
纳米技术
纳米颗粒
催化作用
粒子(生态学)
化学工程
拉曼光谱
分子
胶体
金属
化学
有机化学
地质学
工程类
物理
光学
海洋学
冶金
作者
Ziwei Ye,Chunchun Li,Maurizio Celentano,Matthew Lindley,Tamsin O'Reilly,Adam J. Greer,Yiming Huang,Christopher Hardacre,Sarah J. Haigh,Yikai Xu,Steven E. J. Bell
出处
期刊:JACS Au
[American Chemical Society]
日期:2021-12-16
卷期号:2 (1): 178-187
被引量:31
标识
DOI:10.1021/jacsau.1c00462
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.
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