Hwang Sung-Ho, Kim Young Kwang, Hong Seong Hui, Lim Sang Kyoo
Division of Energy Technology of the Materials Research Institute, DGIST, 333 Techno Jungang-Daero, Hyeonpung-eup, Daegu 42988, Korea.
Nanomaterials (Basel). 2020 Oct 27;10(11):2124. doi: 10.3390/nano10112124.
The development of a highly sensitive gas sensor for toxic gases is an important issue in that it can reduce the damage caused by unexpected gas leaks. In this regard, in order to make the sensor accurate and highly responsive, we have investigated which morphology is effective to improve the sensitivity and how the deposited nanoparticle affects the sensitivity by controlling the morphology of semiconductor oxides-either nanorod or nanoplate-and depositing metal nanoparticles on the semiconductor surface. In this study, we compared the CO gas sensitivity for sensors with different morphology (rod and plate) of ZnO nanostructure with metal nanoparticles (gold and copper) photodeposited and investigated the correlation between the gas sensitivity and some factors such as the morphology of ZnO and the properties of the deposited metal. Among the samples, Au/ZnO nanorod showed the best response (~86%) to the exposure of 100 ppm CO gas at 200 °C. The result showed that the electrical properties due to the deposition of metal species also have a strong influence on the sensor properties such as sensor response, working temperature, the response and recovery time, etc., together with the morphology of ZnO.
开发用于检测有毒气体的高灵敏度气体传感器是一个重要课题，因为它可以减少意外气体泄漏造成的损害。在这方面，为了使传感器准确且响应灵敏，我们研究了哪种形态能有效提高灵敏度，以及通过控制半导体氧化物（纳米棒或纳米片）的形态并在半导体表面沉积金属纳米颗粒，沉积的纳米颗粒如何影响灵敏度。在本研究中，我们比较了光沉积有金属纳米颗粒（金和铜）的不同形态（棒状和平板状）的ZnO纳米结构传感器对CO气体的灵敏度，并研究了气体灵敏度与一些因素之间的相关性，如ZnO的形态和沉积金属的性质。在这些样品中，Au/ZnO纳米棒在200℃下对100 ppm CO气体的暴露表现出最佳响应（约86%）。结果表明，除了ZnO的形态外，金属物种沉积所导致的电学性质对传感器性能，如传感器响应、工作温度、响应和恢复时间等也有很大影响。
