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

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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.

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