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High quality single crystalline VO2(A) nanowires were synthesized by a facile hydro- thermal method using oxalic acid as reducing agent and polyethylene glycol 6000 as surfactant. It was found that polyethylene glycol 6000 can effectively accelerate the transformation from V2O5 pre- cursor to VO2(B), and there is no intermediate phase V3O7∙H2O formed. Thus less time and lower temperature were needed in our hydrothermal method. The investigation of growth mechanism in- dicates an oriented attachment growth process in the hydrothermal system. In addition, the temper- ature-dependent optical switching properties have been studied. The results show that VO2(A) nanowires exhibit distinct temperature-dependent optical switching properties, which can be poten- tially explored for optical switching devices.

PEG-assisted hydrothermal synthesis of VO2(A) nanowires with remarkable optical switching properties