Flexible and Scalable VO2(M2) Nanorod Arrays Grafted Glass Fiber Cloth for Efficient Electromagnetic Regulation

Abstract

M₂ phase vanadium dioxide (VO₂(M₂)) is an intermediate polymorph phase during the reversible phase transition from VO₂(M₁) to VO₂(R), which can be stabilized at room temperature by doping or introducing strain in the film. In this study, we provide a simple and scalable preparation of VO₂(M₂) nanorods on TiO₂ nanoparticles decorated flexible glass fiber cloth (GFC) by hydrothermal and subsequent annealing process. Because of the interfacial strain between TiO₂ and VO₂, M₂ phase VO₂ nanorods were successfully fabricated and verified. The resultant VO₂(M₂)/GFC composite demonstrates a remarkable resistance change (∼3.4 × 10⁴) across the phase transition, which is superior to the films prepared by vacuum chamber-based techniques. Meanwhile, it also demonstrates 13.1 times enhanced electromagnetic shielding efficiency and favorable emissivity modulation capability. The flexible and scalable preparation of VO₂(M₂) will broaden the promising applications of the material in both optical and electronic devices.