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article
Role of defects in the phase transition of VO2 nanoparticles probed by plasmon resonance spectroscopy
Abstract
Defects are known to affect nanoscale phase transitions, but their specific role in the metal-to-insulator transition in VO<sub>2</sub> 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 VO<sub>2</sub> nanoparticles, we find that hysteresis width narrows with increasing size, thus illustrating the potential for domain boundary engineering in phase-changing nanostructures.