Ultra-sensitive and fast-responding H2 gas sensors based on Zn2SnO4 nanoarchitectures

This study presents hydrogen sensors utilizing Zn 2 SnO 4 -nanohybrid structures developed on anodic aluminum oxide (AAO) substrates. Films with nanorod networks, nanoporous layers, and nanotube arrays were produced using a one-step sputtering process. These nanostructures possess a significantly increased specific surface area, crucial for improving gas sensing capabilities. By systematically varying Ar/O 2 ratios (9:1, 8:2, 6:4, and 7:3), subtle compositional variations were observed, suggesting potential doping effects of Sn or Zn. The sensors exhibited an impressive response of approximately 265.5 to 50 ppm of hydrogen gas at 250 °C, with a low detection limit of 0.5 ppm and a rapid 6-second response time. Furthermore, the sensors demonstrated excellent selectivity, long-term durability, and strong resistance to humidity fluctuations. This research addresses challenges related to Zn 2 SnO 4 -based H 2 sensors by offering a cost-effective synthesis approach, promising the development of reliable and high-performance sensors for future applications.