Enhanced humidity sensing performance using Sn-Doped ZnO nanorod Array/SnO2 nanowire heteronetwork fabricated via two-step solution immersion

A unique heteronetwork consisting of crystalline tin-doped zinc oxide nanorod arrays and rutile tin oxide nanowires (SZO/SnO2) was fabricated for the first time using a two-step solution immersion method at a low temperature and immersion time (2 h) for humidity sensing applications. The average diameter and thickness of the SZO are approximately 95 and 730 nm, respectively. The diameter of the SnO2 nanowires ranges from 60 nm to 120 nm, and the length of the nanowire is approximately 10 µm. The SZO/SnO2-based humidity sensor exhibits high stability and superior humidity sensing performance compared with the SZO-, SnO2-, and ZnO/SnO2-based sensors with a sensitivity of 67.8. Results demonstrate that the unique architecture of SZO/SnO2 heteronetwork can enhance the humidity sensing capabilities of the nanowires.