摘要：Vanadium dioxide (VO 2 ) is a strongly correlated electronic material with a metal-insulator transition (MIT) near room temperature. Ion-doping to VO 2 dramatically alters its transport properties and the MIT temperature. Recently, insulating hydrogenated VO 2 (HVO 2 ) accompanied by a crystal structure transformation from VO 2 was experimentally observed. Despite the important steps taken towards realizing novel applications, essential physics such as the diffusion constant of intercalated protons and the crystal transformation energy between VO 2 and HVO 2 are still lacking. In this work, we investigated the physical parameters of proton diffusion constants accompanied by VO 2 to HVO 2 crystal transformation with temperature variation and their transformation energies. It was found that protons could propagate several micrometers with a crystal transformation between VO 2 and HVO 2 . The proton diffusion speed from HVO 2 to VO 2 was approximately two orders higher than that from VO 2 to HVO 2. The long-range propagation of protons leads to the possibility of realizing novel iontronic applications and energy devices.
