Title: | Encapsulated Silver Nanoparticles Can Be Directly Converted toSilver Nanoshell in the Gas Phase |
Authors: | Peipei Yang, Yong Xu, Lei Chen, Xuchun Wang, Baohua Mao, Zhongzhi Xie, Sui-Dong Wang, Feng Bao, and Qiao Zhang* |
Institutions: | Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano and Soft Materials (FUNSOM), and Collaborative Innovation Centre of Suzhou Nano Science and Technology, SWC for Synchrotron Radiation Research, Soochow University, Suzhou 215123, P. R. China |
Abstract: | We report, for the first time, that an encapsulated silver nanoparticle can be directly converted to a silver nanoshell through a nanoscale localized oxidation and reduction process in the gas phase. Silver can be etched when exposed to a mixture of NH3/O2 gases through a mechanism analogous to the formation of aqueous Tollens’ reagent, in which a soluble silver−ammonia complex was formed. Starting with Ag@resorcinol-formaldehyde (RF) resin core−shell nanoparticles, we demonstrate that RF-core@Ag-shell nanoparticles can be prepared successfully when the etching rate and RF thickness were well controlled. Due to the strong surface plasmon resonance (SPR) coupling effect among neighboring silver nanoparticles, the RF@Ag nanoparticle showed great SPR and SERS performance. This process provides a general route to the conversion of Ag-core to Ag-shell nanostructures and might be extended to other systems. |
IF: | 13.592 |
Link: | http://pubs.acs.org/doi/abs/10.1021/acs.nanolett.5b04328 Editor: Danting Xiang |