Role of Defects in the Phase Transition of VO2 Nanoparticles Probed by Plasmon Resonance Spectroscopy

被引：208

作者：

Appavoo, Kannatassen ^{[1
,2
]}

Lei, Dang Yuan ^{[3
]}

Sonnefraud, Yannick ^{[3
]}

Wang, Bin ^{[4
]}

Pantelides, Sokrates T. ^{[4
,5
]}

Maier, Stefan A. ^{[3
]}

Haglund, Richard F., Jr. ^{[1
,2
,4
]}

机构：

[1] Vanderbilt Univ, Interdisciplinary Program Mat Sci, Nashville, TN 37235 USA

[2] Vanderbilt Univ, Inst Nanoscale Sci & Engn, Nashville, TN 37235 USA

[3] Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2AZ, England

[4] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA

[5] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA

来源：

NANO LETTERS | 2012年 / 12卷 / 02期

基金：

英国工程与自然科学研究理事会; 美国国家科学基金会;

关键词：

Vanadium dioxide; VO2; phase transition; interface; defect; size effect; localized surface plasmon resonance; density functional theory; domain boundary engineering; METAL-INSULATOR-TRANSITION; GRAIN-BOUNDARIES; STRAIN; NUCLEATION;

D O I：

10.1021/nl203782y

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Defects are known to affect nanoscale phase transitions, but their specific role in the metal-to-insulator transition in VO2 has remained elusive. By combining plasmon resonance nanospectroscopy with density functional calculations, we correlate decreased phase-transition energy with oxygen vacancies created by strain at grain boundaries. By measuring the degree of metallization in the lithographically defined VO2 nanoparticles, we find that hysteresis width narrows with increasing size, thus illustrating the potential for domain boundary engineering in phase-changing nanostructures.

引用

页码：780 / 786

页数：7

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