| Summary: | The larger surface-to-volume ratio of the hierarchical nanostructure means it has attracted considerable interest as a prototype gas sensor. Both TiO<sub>2</sub> and SnS<sub>2</sub> can be used as sensitive materials for humidity sensing with excellent performance. However, TiO<sub>2</sub>-SnS<sub>2</sub> nanocomposites are rarely used in humidity detection. Therefore, in this work, a new humidity sensor was prepared by a simple one-step synthesis process based on nano-heterostructures, and the humidity sensing performance of the device was systematically characterized by much faster response/recovery behavior, better linearity and greater sensitivity compared to pure TiO<sub>2</sub> or SnS<sub>2</sub> nanofibers. The enhanced sensitivity of the nanoheterostructure should be attributed to its special hierarchical structure and TiO<sub>2</sub>-SnS<sub>2</sub> heterojunction, which ultimately leads to a significant change in resistance upon water molecule exposure. In consideration of its non-complicated, cost-effective fabrication process and environmental friendliness, the TiO<sub>2</sub>-SnS<sub>2</sub> nanoheterostructure is a hopeful candidate for humidity sensor applications.
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