Unravelling the Mechanisms of Gold-Silver Core-Shell Nanostructure Formation by in Situ TEM Using an Advanced Liquid Cell Design

被引：67

作者：

Hutzler, Andreas ^{[1
]}

Schmutzler, Tilo ^{[2
]}

Jank, Michael P. M. ^{[3
]}

Branscheid, Robert ^{[4
,5
]}

Unruh, Tobias ^{[2
]}

Spiecker, Erdmann ^{[4
,5
]}

Frey, Lothar ^{[1
,3
]}

机构：

[1] Friedrich Alexander Univ Erlangen Nurnberg FAU, Dept Elect Elect & Commun Engn, Electron Devices LEB, Cauerstr 6, D-91058 Erlangen, Germany

[2] Friedrich Alexander Univ Erlangen Nurnberg FAU, Dept Phys, ICSP, Staudtstr 3, D-91058 Erlangen, Germany

[3] Fraunhofer Inst Integrated Syst & Device Technol, Schottkystr 10, D-91058 Erlangen, Germany

[4] Friedrich Alexander Univ Erlangen Nurnberg FAU, Inst Micro & Nanostruct Res IMN, Cauerstr 6, D-91058 Erlangen, Germany

[5] Friedrich Alexander Univ Erlangen Nurnberg FAU, Ctr Nanoanal & Electron Microscopy CENEM, Dept Mat Sci & Engn, Cauerstr 6, D-91058 Erlangen, Germany

来源：

NANO LETTERS | 2018年 / 18卷 / 11期

关键词：

Liquid cell TEM; Ag@Au; core-shell; electron beam-induced growth; plasmonic structures; graphene; TRANSMISSION ELECTRON-MICROSCOPY; PLATINUM NANOCRYSTAL GROWTH; RADIATION-CHEMISTRY; OPTICAL-PROPERTIES; NANOPARTICLES; NANORODS; NUCLEATION; KINETICS; SHAPE;

D O I：

10.1021/acs.nanolett.8b03388

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The growth of silver shells on gold nanorods is investigated by in situ liquid cell transmission electron microscopy using an advanced liquid cell architecture. The design is based on microwells in which the liquid is confined between a thin Si3N4 membrane on one side and a few-layer graphene cap on the other side. A well-defined specimen thickness and an ultraflat cell top allow for the application of high-resolution TEM and the silicon nitride application of analytical TEM techniques on the same sample. The combination of high-resolution data with chemical information is validated by radically new insights into the growth of silver shells on cetrimonium bromide stabilized gold nanorods. It is shown that silver bromide particles already formed in the stock solution play an important role in the exchange of silver ions. The Ag shell growth can be directly correlated with the layer-by-layer dissolution of AgBr nanocrystals, which can be controlled by the electron flux density via distinctly generated chemical species in the solvent. The derived model framework is confirmed by in situ UV-vis absorption spectroscopy evaluating the blue shift in the longitudinal surface plasmon resonance of anisotropic NRs in a complementary batch experiment.

引用

页码：7222 / 7229

页数：8