SnO₂ is widely used for ethanol-sensing applications due to its excellent physicochemical properties, low toxicity and high sensitivity. However it is a challenge to construct 3D-hierarchical structures with sub 5 nm primary grain particle, which is the optimized size for ethanol sensor. Herein, genetic tri-level hierarchical SnO₂ microstructures are synthesised by the genetic conversion of 3D hierarchical SnS₂ flowers assembled by ultrathin nanosheets. The SnS₂ nanosheets are morphology genetic converted to porous nanosheets with sub 5 nm SnO₂ nanoparticles during the calcination process. When used for the detection of ethanol, the sensor exhibits a high sensitivity of 0.5 ppm (R _a/R _g=6.8) and excellent gas-sensing response (R _a/R _g = 183 to 100 ppm) with short response/recovery time (12 s/11 s). The excellent gas sensing performance is much better than that of the previous reported SnO₂-based sensors. The highly sensitivity is attributed to the large surface area derived from the recrystallization and volume changes, which offers more active sites during the morphology genetic conversion from SnS₂ to SnO₂. Furthermore, the flower-like 3D structure enhances the stability of the materials and is beneficial for the mass diffusion dynamics of ethanol.

SnO ₂因其优异的理化性质、低毒性和高灵敏度而广泛用于乙醇传感应用。然而，构建具有亚 5 nm 初级颗粒的 3D 分层结构是一项挑战，这是乙醇传感器的优化尺寸。在此，通过超薄纳米片组装的 3D 分层 SnS ₂花的遗传转化合成了遗传三级分层 SnO ₂微结构。SnS ₂纳米片在煅烧过程中通过形态遗传转化为具有亚5 nm SnO ₂纳米颗粒的多孔纳米片。当用于检测乙醇时，该传感器具有 0.5 ppm ( R _a / R _g =6.8) 和出色的气敏响应 ( R _a / R _g = 183 至 100 ppm)，响应/恢复时间短 (12 s/11 s)。出色的气体传感性能比之前报道的基于SnO ₂的传感器要好得多。高灵敏度归因于再结晶和体积变化产生的大表面积，这在从 SnS ₂到 SnO ₂的形态遗传转化过程中提供了更多的活性位点。此外，花朵状的 3D 结构增强了材料的稳定性，有利于乙醇的质量扩散动力学。