College of Control Science and Engineering, China University of Petroleum (East China), Qingdao 266580, China.
College of Control Science and Engineering, China University of Petroleum (East China), Qingdao 266580, China.
J Colloid Interface Sci. 2022 Jan 15;606(Pt 1):261-271. doi: 10.1016/j.jcis.2021.08.022. Epub 2021 Aug 8.
Morphological and structural characteristics of semiconductors have a significant impact on their gas sensing characteristics. Reasonable design and synthesis of heterojunctions with special structures can effectively improve sensor performance. Herein, a cobalt oxide (CoO) nanofibers/cadmium sulfide (CdS) nanospheres hybrid was synthesized by an electrospinning method combined with a hydrothermal method to detect acetone gas. By adjusting loading amount of CdS, the sensing performance of CdS/CoO sensor for acetone at room temperature (25 °C) was greatly ameliorated. In particular, the response of CdS/CoO to 50 ppm acetone gas increased by 25% under 520 nm green light, meanwhile, the response/recovery time was shortened to 5 s/4 s. This is attributed to the heterojunction formed between CdS and CoO as well as the influence of light excitation on the carrier concentration of the surfaces. Meanwhile, the unique high-porosity fiber structure and the catalytic action of cobalt ions also play an essential role in improving the performance. Furthermore, practical diabetic breath was experimentally simulated and proved the potential of the sensor in the future application of disease-assisted diagnosis.
半导体的形态和结构特征对其气体传感特性有重大影响。通过合理设计和合成具有特殊结构的异质结，可以有效改善传感器的性能。本文采用静电纺丝法结合水热法合成了氧化钴（CoO）纳米纤维/硫化镉（CdS）纳米球杂化材料，用于检测丙酮气体。通过调节 CdS 的负载量，CdS/CoO 传感器对室温（25°C）下丙酮的传感性能得到了极大改善。特别是在 520nm 绿光照射下，CdS/CoO 对 50ppm 丙酮气体的响应提高了 25%，同时响应/恢复时间缩短至 5s/4s。这归因于 CdS 和 CoO 之间形成的异质结以及光激发对表面载流子浓度的影响。同时，独特的高多孔纤维结构和钴离子的催化作用也对提高性能起着至关重要的作用。此外，还对实际的糖尿病患者呼吸进行了实验模拟，证明了该传感器在未来疾病辅助诊断中的应用潜力。
