State Key Laboratory on Integrated Optoelectronics, Key Laboratory of Gas Sensors, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, Jilin Province 130012, China.
State Key Laboratory on Integrated Optoelectronics, Key Laboratory of Gas Sensors, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, Jilin Province 130012, China.
J Colloid Interface Sci. 2022 Dec;627:332-342. doi: 10.1016/j.jcis.2022.07.052. Epub 2022 Jul 14.
Herein, we reported cadmium sulfide derivatives pine needles-like CdS/CdO heterostructure hybrids synthesized by hydrothermal treatment and subsequent self-template oxidation approach. The component ratio of the CdS/CdO hybrids can be controlled specifically via tuning the annealing treatment protocol, and thereby giving rise to the optimization of morphology, electrical characteristics, and gas sensing properties of derived hybrids. As proof of concept, the pine needles-like CdS/CdO, which obtained after different annealing temperatures and durations, as sensitive material was employed to manufacture HS gas sensors. The sensor based on CdS/CdO hybrids (400 °C & 1 h) exhibited high sensitivity (73.5 to 5 ppm), ppb-level limit of detection (10 ppb), and excellent selectivity regardless of the interference of other gases at optimal working temperature of 200 °C. Due to the abnormal resistance variation of n-type cadmium sulfide derived hybrids while contacting with HS, the sensing mechanism mainly depends on the surface chemical conversion from oxide to sulfide. The pine needles-like hierarchical morphology provided an excellent scaffold for the carriers transportation and the growth of the CdO, which played a key role in resistance modulation both in air and target gas, resulting in the enhanced HS sensing performance ultimately.
在此，我们报道了通过水热处理和随后的自模板氧化方法合成的具有针状松针结构的硫化镉衍生物 CdS/CdO 异质结构混合物。通过调整退火处理方案，可以有针对性地控制 CdS/CdO 混合物的成分比例，从而优化衍生混合物的形貌、电学特性和气体传感性能。作为概念验证，以不同退火温度和时间获得的针状 CdS/CdO 作为敏感材料，用于制造 HS 气体传感器。基于 CdS/CdO 混合物（400°C&1h）的传感器在最佳工作温度 200°C 下表现出高灵敏度（73.5 至 5 ppm）、ppb 级检测限（10 ppb）和出色的选择性，无论其他气体的干扰如何。由于与 HS 接触时 n 型硫化镉衍生混合物的异常电阻变化，因此传感机制主要取决于从氧化物到硫化物的表面化学转化。针状分级形貌为载流子的传输和 CdO 的生长提供了极好的支架，这在空气和目标气体中的电阻调制中起着关键作用，最终提高了 HS 传感性能。
