Shen Yunkun, Wang Kaili, Liu Hao, Chen Liping, Jin Zhihan, Yan Shancheng
College of Automation & College of Artificial Intelligence, Nanjing University of Posts and Telecommunications, Nanjing 210023, China.
School of Integrated Circuit Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China.
Sensors (Basel). 2023 Nov 10;23(22):9097. doi: 10.3390/s23229097.
Gas sensors play a pivotal role in environmental monitoring, with NO sensors standing out due to their exceptional selectivity and sensitivity. Yet, a prevalent challenge remains: the prolonged recovery time of many sensors, often spanning hundreds of seconds, compromises efficiency and undermines the precision of continuous detection. This paper introduces an efficient NO sensor using TeO nanowires, offering significantly reduced recovery times. The TeO nanowires, prepared through a straightforward thermal oxidation process, exhibit a unique yet smooth surface. The structural characterizations confirm the formation of pure-phase TeO after the anneal oxidation. TeO nanowires are extremely sensitive to NO gas, and the maximum response (defined as the ratio of resistance in the air to that under the target gas) to NO (10 ppm) is 1.559. In addition, TeO nanowire-based sensors can return to the initial state in about 6-7 s at 100 °C. The high sensitivity can be attributed to the length-diameter rate, which adsorbs more NO to facilitate the electron transfer. The fast recovery is due to the smooth surface without pores on TeO nanowires, which may release NO quickly after stopping the gas supply. The present approach for sensing TeO nanowires can be extended to other sensor systems as an efficient, accurate, and low-priced tactic to enhance sensor performance.
气体传感器在环境监测中起着关键作用，其中NO传感器因其卓越的选择性和灵敏度而脱颖而出。然而，一个普遍存在的挑战依然存在：许多传感器的恢复时间过长，通常长达数百秒，这降低了效率并影响了连续检测的精度。本文介绍了一种使用TeO纳米线的高效NO传感器，其恢复时间显著缩短。通过简单的热氧化工艺制备的TeO纳米线具有独特且光滑的表面。结构表征证实了退火氧化后形成了纯相TeO。TeO纳米线对NO气体极为敏感，对10 ppm的NO的最大响应（定义为空气中的电阻与目标气体下的电阻之比）为1.559。此外，基于TeO纳米线的传感器在100°C时约6 - 7秒即可恢复到初始状态。高灵敏度可归因于长径比，其吸附更多的NO以促进电子转移。快速恢复是由于TeO纳米线表面光滑无孔，在停止供气后可能会迅速释放NO。目前这种用于传感TeO纳米线的方法可以扩展到其他传感器系统，作为一种提高传感器性能的高效、准确且低价的策略。
