Solid-State Chemistry on the Nanoscale: Ion Transport through Interstitial Sites or Vacancies?

被引：41

作者：

Bothe, Cornelia ^{[1
]}

Kornowski, Andreas ^{[1
]}

Tornatzky, Hans ^{[2
]}

Schmidtke, Christian ^{[1
]}

Lange, Holger ^{[1
,4
]}

Maultzsch, Janina ^{[2
]}

Weller, Horst ^{[1
,3
,4
,5
]}

机构：

[1] Univ Hamburg, Inst Phys Chem, Fachbereich Chem, D-20146 Hamburg, Germany

[2] Tech Univ Berlin, Inst Festkorperphys, D-10623 Berlin, Germany

[3] Ctr Angew Nanotechnol, D-20146 Hamburg, Germany

[4] Hamburg Ctr Ultrafast Imaging CUI, D-22761 Hamburg, Germany

[5] King Abdulaziz Univ, Fac Sci, Dept Chem, Jeddah, Saudi Arabia

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2015年 / 54卷 / 47期

关键词：

cation exchange; nanoparticles; PbSe; reaction kinetics; ZnSe; DOT QUANTUM-WELL; SEMICONDUCTOR NANOCRYSTALS; CATION-EXCHANGE; DIFFUSION; PHOTOPHYSICS; CDS/HGS/CDS; MODEL; LESS; GOLD;

D O I：

10.1002/anie.201507263

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

How can ion-exchange process occur in nanocrystals without the size and shape changing and why is the ion transport much faster than in classical interdiffusion processes in macrocrystalline solids? We have investigated these processes at the molecular level by means of high-resolution and analytical electron microscopy in temperature-dependent kinetic experiments for several model reactions. The results clearly show a diffusion process that proceeds exclusively through the interstitial lattice positions with a subsequent "kick out" to remove individual ions from lattice sites without the formation of vacancies. This mechanism has not been observed in nanocrystalline systems before.

引用

页码：14183 / 14186

页数：4

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