Wang Tao, Xing Quan, Zhai Ruixiong, Huang Taihong, Song Peng
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China.
Faculty of Civil Aviation and Aeronautics, Kunming University of Science and Technology, Kunming 650093, China.
ACS Sens. 2024 Jun 28;9(6):3178-3186. doi: 10.1021/acssensors.4c00485. Epub 2024 May 22.
Large emissions of nitrogen dioxide (NO) pose a significant threat to human health, Monitoring its content and implementing timely measures are crucial. Utilizing oxide semiconductors, such as tin dioxide (SnO), has proven to be an effective way to detect and analyze NO. The design and preparation of sensing materials with high sensitivity and excellent selectivity is the key to improve the detection efficiency. SnO nanopowders with small and uniform particle size, large specific surface area, adjustable defect content, and no impurities were prepared by a new plasma spraying method. The SnO nanopowders exhibit outstanding performance in detecting NO at a low temperature of 100 °C, the response to 5 ppm of NO reaches 48, and the material demonstrates rapid response and recovery times, coupled with excellent selectivity. The exceptional gas-sensitive properties can be attributed to the superior morphology and structure of SnO. It provides more reaction sites for gas sensitive reactions, fast electron transport, a large number of charge carriers, and improved adsorption of the material to the target gas. This study provides valuable insights into nanomaterial preparation and the enhancement of gas-sensitive properties for SnO.
大量二氧化氮（NO）排放对人类健康构成重大威胁，监测其含量并及时采取措施至关重要。利用氧化物半导体，如二氧化锡（SnO），已被证明是检测和分析NO的有效方法。设计和制备具有高灵敏度和优异选择性的传感材料是提高检测效率的关键。通过一种新的等离子喷涂方法制备了粒径小且均匀、比表面积大、缺陷含量可调且无杂质的SnO纳米粉末。SnO纳米粉末在100℃的低温下检测NO时表现出优异性能，对5 ppm NO的响应达到48，且该材料具有快速的响应和恢复时间，以及优异的选择性。这种优异的气敏性能可归因于SnO优越的形貌和结构。它为气敏反应提供了更多反应位点、快速的电子传输、大量的电荷载流子，并改善了材料对目标气体的吸附。本研究为纳米材料制备以及SnO气敏性能增强提供了有价值的见解。
