Ultrafast methanol sensing properties of nano-spindle like In2O3 hierarchical structures with oxygen vacancies

摘要： Unique nano-spindle like In2O3 hierarchical structures have been successfully prepared using a simplified solvothermal method. The micromorphology and crystalline structure of the as-obtained are characterized by SEM, TEM, and XRD. Morphology analysis reveals that the nano-spindle like In2O3 hierarchical structures are composed of numerous ordered nanorods. The optical properties of the samples are also studied, and it is confirmed that the presence of a large amount of oxygen vacancies in the as-synthesized samples. The as-synthesized nano-spindle like In2O3 hierarchical structures are used for the detection of the methanol gas. The sensing properties of the as-manufactured sensor are carefully discussed and the sensor shows outstanding methanol sensing performance, especially ultrafast response time (<1 s). The sensing mechanism is also discussed. This work offers the possibility to manufacture low-cost, high-performance methanol sensor based on the as-synthesized nano-spindle like In2O3 hierarchical structures.