Qi Wenzhi, Li Weiwei, Sun Yilin, Guo Jiahui, Xie Dan, Cai Li, Zhu Hongwei, Xiang Lan, Ren Tianling
Beijing National Research Center for Information Science and Technology (BNRist), Institute of Microelectronics, Tsinghua University, Beijing, 100084, People's Republic of China.
Nanotechnology. 2019 Aug 23;30(34):345503. doi: 10.1088/1361-6528/ab1ec0. Epub 2019 May 2.
Room-temperature NO gas sensors are fabricated by employing tin oxide (SnO) nanofibers (NFs) as sensing layers and low-dimension carbon nanomaterials, including single-walled carbon nanotubes (SWCNTs) and reduced graphene oxide (rGO), as conductive interdigital electrodes (IDEs). The morphology characteristics and gas sensing performance of rGO IDEs-SnO and SWCNTs IDEs-SnO gas sensors have been investigated. The results demonstrate that the response of rGO IDEs based sensors achieves 90.0% after been exposed to 12 ppm NO, which is superior to the responses of Ti/Au and SWCNTs IDEs based sensors (55.1% and 16.7%, respectively). The rGO IDEs-SnO sensor exhibits excellent sensitivity, large recovery capability and repeatability, and high selectivity at room temperature. The sensing mechanism of such prominent performance has also been analyzed, revealing that the outstanding properties could be attributed to a large number of active adsorption sites, the formation of a p-n heterojunction and a large effective contact area between the two-dimensional rGO nanosheets and the tube-shaped SnO NFs. This work helps to build up a potential platform to explore effective electrodes for future novel NO gas sensors in practical gas sensing applications.
通过使用氧化锡（SnO）纳米纤维（NFs）作为传感层，并采用包括单壁碳纳米管（SWCNT）和还原氧化石墨烯（rGO）在内的低维碳纳米材料作为导电叉指电极（IDE），制备了室温NO气体传感器。研究了rGO IDEs-SnO和SWCNTs IDEs-SnO气体传感器的形貌特征和气敏性能。结果表明，基于rGO IDEs的传感器在暴露于12 ppm NO后响应率达到90.0%，优于基于Ti/Au和SWCNTs IDEs的传感器（分别为55.1%和16.7%）。rGO IDEs-SnO传感器在室温下表现出优异的灵敏度、较大的恢复能力和重复性以及高选择性。还分析了这种优异性能的传感机制，表明其优异性能可归因于大量的活性吸附位点、p-n异质结的形成以及二维rGO纳米片与管状SnO NFs之间较大的有效接触面积。这项工作有助于建立一个潜在的平台，以探索用于未来实际气敏应用中的新型NO气体传感器的有效电极。
