School of Materials Science and Engineering, Lanzhou University of Technology, Langongping Road, Lanzhou 730050, China.
Sensors (Basel). 2022 Aug 31;22(17):6571. doi: 10.3390/s22176571.
In this study, pure zinc stannate (ZnSnO) and bismuth (Bi)-doped ZnSnO composites (Bi-ZnSnO) were synthesized via the in situ precipitation method, and their microstructures, morphologies, chemical components, sizes, and specific surface areas were characterized, followed by testing their gas sensing properties. The results revealed that Bi-ZnSnO showed superior gas sensing properties to -butanol gas, with an optimal operating temperature of 300 °C, which was 50 °C lower than that of pure ZnSnO. At this temperature, moreover, the sensitivity of Bi-ZnSnO to -butanol gas at the concentration of 100 ppm reached as high as 1450.65, which was 35.57 times that (41.01) of ammonia gas, 2.93 times that (495.09) of acetone gas, 6.02 times that (241.05) of methanol gas, 2.54 times that (571.48) of formaldehyde gas, and 2.98 times that (486.58) of ethanol gas. Bi-ZnSnO had a highly repeatable performance. The total proportion of oxygen vacancies and chemi-adsorbed oxygen in Bi-ZnSnO (4 wt%) was 27.72% to 32.68% higher than that of pure ZnSnO. Therefore, Bi-ZnSnO has considerable potential in detecting -butanol gas by virtue of its excellent gas-sensing properties.
在这项研究中，通过原位沉淀法合成了纯锌锡酸（ZnSnO）和掺铋（Bi）的 ZnSnO 复合材料（Bi-ZnSnO），并对其微观结构、形貌、化学成分、尺寸和比表面积进行了表征，随后测试了其气体传感性能。结果表明，Bi-ZnSnO 对正丁醇气体具有优异的气体传感性能，最佳工作温度为 300°C，比纯 ZnSnO 低 50°C。此外，在该温度下，Bi-ZnSnO 对 100ppm 正丁醇气体的灵敏度高达 1450.65，是氨气（41.01）的 35.57 倍，丙酮（495.09）的 2.93 倍，甲醇（241.05）的 6.02 倍，甲醛（571.48）的 2.54 倍，乙醇（486.58）的 2.98 倍。Bi-ZnSnO 具有高度可重复性的性能。Bi-ZnSnO（4wt%）中氧空位和化学吸附氧的总比例比纯 ZnSnO 高 27.72%至 32.68%。因此，Bi-ZnSnO 凭借其优异的气体传感性能，在检测正丁醇气体方面具有相当大的潜力。
