A paradoxical contraction appearing in Eu3+ doped vanadium dioxide (B) nanocrystal via hydrothermal process

The aim of the present study is to survey the influence of additive Eu on the synthesis and properties of VO2 (B). Eu-doped VO2 (B) nanocrystal was directly synthesized through a facile one-step hydrothermal route for the first time at 200 °C for 24 h. The samples are characterized by XRD, SEM, TEM, DSC, and EIS. It is firstly indicated that a paradoxical contraction phenomenon exists in Eu-doped VO2 (B) nanomaterials in range from 20 °C to 35 °C. The resistance values of VO2 (B) nanocrystal can be reduced with the increase of test temperature or via Eu3+ doping process. So the Eu-doped VO2 (B) has the potential application in lithium ion battery.