In a high relative humidity (RH) environment, it is challenging for ethanol sensors to maintain a high response and excellent selectivity. Herein, tetragonal rutile SnO₂ nanosheets decorated with NiO nanoparticles were synthesized by a two-step hydrothermal process. The NiO-decorated SnO₂ nanosheet-based sensors displayed a significantly improved sensitivity and excellent selectivity to ethanol gas. For example, the 3 mol% NiO-decorated SnO₂ (SnO₂-3Ni) sensor reached its highest response (153 at 100 ppm) at an operating temperature of 260 °C. Moreover, the SnO₂-3Ni sensor had substantially improved moisture resistance. The excellent properties of the sensors can be attributed to the uniform dispersion of the NiO nanoparticles on the surface of the SnO₂ nanosheets and the formation of NiO-SnO₂ p–n heterojunctions. Considering the long-term stability and reproducibility of these sensors, our study suggests that the NiO nanoparticle-decorated SnO₂ nanosheets are a promising material for highly efficient detection of ethanol.

在高相对湿度 (RH) 环境中，乙醇传感器很难保持高响应和出色的选择性。在此，通过两步水热法合成了用 NiO 纳米颗粒装饰的四方金红石 SnO ₂纳米片。NiO 装饰的基于SnO ₂纳米片的传感器显示出显着提高的灵敏度和对乙醇气体的出色选择性。例如，3 mol% NiO 装饰的 SnO ₂ (SnO ₂ -3Ni) 传感器在 260 °C 的工作温度下达到其最高响应（153 在 100 ppm）。此外，SnO ₂-3Ni 传感器的防潮性能显着提高。传感器的优异性能可归因于 NiO 纳米颗粒在 SnO ₂纳米片表面的均匀分散和 NiO-SnO ₂ p-n 异质结的形成。考虑到这些传感器的长期稳定性和可重复性，我们的研究表明，NiO 纳米颗粒装饰的 SnO ₂纳米片是一种有前途的高效检测乙醇的材料。