Rapid Single‐Step Hydrothermal Synthesis of Phase Pure VO₂ (M) with Tailored Morphology

Monoclinic VO 2 (M) is a material of great significance in the study of correlation effects in solids because of its reversible metal‐insulator phase transition between VO 2 (M) and VO 2 (R) just above the room temperature. Synthesizing pure monoclinic VO 2 (M) can be a challenging task due to the formation of other polymorphs such as VO 2 (A), VO 2 (B), VO 2 (D) and VO 2 (P) etc. during the synthesis. Additionally, these synthesis techniques involve complex multistep procedures with protective gas environment and controlled reaction parameters clubbed with elongated reaction time ranging from 1 to 7 days which are major obstacles in the mass production of this material. Here we report a novel and rapid synthetic protocol of VO 2 (M) for first time using diethylene triamine (DETA) as a reducing and morphology controlling agent in hydrogen peroxide medium. The detailed characterization of prepared materials confirms the formation of phase pure VO 2 (M) crystalline powders. The present approach helps to tune these particles from one‐dimensional rods to two‐dimensional petals like structures.