Phase-change regulation criterion based on size-dependent lattice distortion rate and born theory for VO2 nanomaterials

Abstract

Vanadium dioxide (VO2) is a promising thermally induced phase transition material because of the abrupt changes in electrical and optical properties. However, the high phase transition temperature of VO2 and its unspecified modulation relationship need to be resolved urgently. Herein, we proposed a simple and precise regulation criterion for VO2 materials based on size-dependent lattice distortion rate and Born theory. The results indicated that the application of a tensile stress changed the elastic properties of the VO2, which promoted VO2 phase transition, and regulated the phase transition temperature. Moreover, the specific modulation relationship between the stress and phase transition temperature of VO2 was confirmed experimentally. These results show that our criterion provides theoretical guidance to regulate VO2 thermally induced phase transition materials.