Abstract ZnSnO3 nanospheres assembled by numerous thin triangular nanosheets were successfully synthesized by a facile co-precipitation method. The structure and morphology of ZnSnO3 nanospheres were characterized by means of SEM, XRD, TEM and XPS. It showed that ZnSnO3 nanospheres with perovskite structure were approximately 500 nm in diameter and densely packed by many triangular nanosheets. Zn, Sn and O elements were uniformly distributed in the obtained nanospheres. Gas sensing measurements indicated that ZnSnO3 nanospheres with n-type semiconductor characteristics showed fast response, good reversibility, high selectivity and repeatability to n-propanol gas at evaluated operating temperature. The peak response of the gas sensor based on ZnSnO3 nanospheres to n-propanol gas was obtained at an operating temperature of 200 °C. Especially, the detection limit of ZnSnO3 nanospheres to 500 ppb n-propanol gas could reach 1.7. The gas sensing mechanism was discussed and explained by the electron depletion theory and oxygen vacancy difference. It indicated that the as-prepared ZnSnO3 nanospheres could be a potential material for fabricating high-performance n-propanol gas sensors.

中文翻译：

---

基于钙钛矿型ZnSnO3纳米球的气体传感器的制备、表征和正丙醇传感特性

摘要 通过简便的共沉淀法成功合成了由大量三角形薄纳米片组装而成的ZnSnO3纳米球。通过SEM、XRD、TEM和XPS对ZnSnO3纳米球的结构和形貌进行了表征。结果表明，具有钙钛矿结构的 ZnSnO3 纳米球直径约为 500 nm，并由许多三角形纳米片密集堆积。Zn、Sn和O元素均匀分布在所得纳米球中。气敏测量表明，具有 n 型半导体特性的 ZnSnO3 纳米球在评估的工作温度下对正丙醇气体显示出快速响应、良好的可逆性、高选择性和可重复性。基于 ZnSnO3 纳米球的气体传感器对正丙醇气体的峰值响应是在 200°C 的工作温度下获得的。尤其，ZnSnO3纳米球对500ppb正丙醇气体的检测限可达1.7。用电子耗尽理论和氧空位差对气敏机理进行了讨论和解释。这表明所制备的 ZnSnO3 纳米球可能是制造高性能正丙醇气体传感器的潜在材料。