CSIR Central Glass and Ceramic Research Institute, 196, Raja S. C. Mullick Road, Jadavpur, Kolkata-700032, India.
Mater Horiz. 2022 Jun 6;9(6):1750-1762. doi: 10.1039/d2mh00236a.
Chemiresistive gas sensors operate mainly at high temperatures, primarily due to the need of energy for surface adsorption-desorption of analytes. As a result, the operating temperature of the chemiresistive sensors could be reduced only to room temperature. Hence, a plethora of sensing requirements at temperatures below ambient have remained outside the scope of chemiresistive materials. In this work, we have developed an antimony-doped SnO nanocube-supported expanded polypyrrole network that could detect low ppm ammonia gas (≤20 ppm) at sub-zero temperatures with high response (∼4), selectivity, and short response and recovery times. The low temperature chemiresistive sensing has been explained in terms of the interplay of an extended conducting network of an deposited polymer, effective transport properties of majority charge carriers and a loosely bound exciton-like electron-hole pair formation and breakage mechanism.
电阻式气体传感器主要在高温下运行，主要是因为需要能量来进行分析物的表面吸附和解吸。因此，电阻式传感器的工作温度只能降低到室温。因此，许多在环境温度以下的传感要求仍然超出了电阻式材料的范围。在这项工作中，我们开发了一种掺锑的 SnO 纳米立方体支撑的扩展聚苯胺网络，它可以在亚零温度下检测低 ppm 氨气（≤20 ppm），具有高响应（约 4）、选择性和较短的响应和恢复时间。低温电阻式传感可以根据沉积聚合物的扩展导电网络、多数电荷载流子的有效传输性质以及松散结合的类激子电子-空穴对形成和断裂机制的相互作用来解释。
