Sacrificial Silver Nanoparticles: Reducing GeI2 To Form Hollow Germanium Nanoparticles by Electroless Deposition

被引：16
|
作者：
Nolan, Bradley M. [1 ]
Chan, Eric K. [1 ]
Zhang, Xinming [2 ]
Muthuswamy, Elayaraja [1 ]
van Benthem, Klaus [2 ]
Kauzlarich, Susan M. [1 ]
机构：
[1] Univ Calif Davis, Dept Chem, 1 Shields Ave, Davis, CA 95616 USA
[2] Univ Calif Davis, Dept Chem Engn & Mat Sci, 1 Shields Ave, Davis, CA 95616 USA
来源：
ACS NANO | 2016年 / 10卷 / 05期
关键词：
germanium nanoparticles; hollow; electroless deposition; galvanic replacement; silver nanoparticles; LITHIUM-ION BATTERIES; GALVANIC REPLACEMENT REACTIONS; ELECTROCHEMICAL PERFORMANCE; BIOLOGICAL APPLICATIONS; CRYSTALLINE GERMANIUM; COLLOIDAL SYNTHESIS; OPTICAL PROPERTIES; ANODE MATERIAL; NANOCRYSTALS; NANOSTRUCTURES;
D O I：
10.1021/acsnano.6b01604
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Herein we report the electroless deposition of Ge onto sacrificial Ag nanoparticle (NP) templates to form hollow Ge NPs. The formation of AgI is a necessary component for this reaction. Through a systematic study of surface passivating ligands, we determined that tri-n-octylphosphine is necessary to facilitate the formation of hollow Ge NPs by acting as a transport agent for GeI2 and the oxidized Ag+ cation (i.e., AgI product). Annular dark field (ADF) scanning transmission electron microscopy (STEM) imaging of incomplete reactions revealed Ag/Ge core/shell NPs; in contrast, completed reactions displayed hollow Ge NPs with pinholes which is consistent with the known method for dissolution of the nanotemplate. Characterization of the hollow Ge NPs was performed by transmission electron microscopy, ADF-STEM, energy-dispersive X-ray spectroscopy, UV-vis spectrophotometry, and Raman spectroscopy. The galvanic replacement reaction of Ag with GeI2 offers a versatile method for controlling the structure of Ge nanomaterials.
引用
收藏
页码：5391 / 5397
页数：7
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