Park Suyoung, Byoun Youngmin, Kang Hyoungku, Song Young-Jun, Choi Sun-Woo
Department of Aviation Maintenance Engineering, Far East University, Eumseong-gun, Chungcheongbuk-do 27601, Republic of Korea.
Metal & Machinery Team, Korea Conformity Laboratories (KCL), Seoul 08503, Republic of Korea.
ACS Omega. 2019 Jun 19;4(6):10677-10686. doi: 10.1021/acsomega.9b00773. eCollection 2019 Jun 30.
To improve the NO-sensing performance of single-walled carbon nanotube (SWCNT)-based sensors, zinc oxide (ZnO) nanoclusters (NCs) were functionalized by a microwave (MW)-assisted synthesis technique. Gas sensors based on pristine SWCNTs and ZnO NC-SWCNT composites synthesized using different weight ratios (ZnO/SWCNTs = 0.5:1, 1:1, 2:1, and 3:1) were fabricated, and their ability to sense various gases at room temperature (25 °C) was investigated. The results showed that the sensing performance of the ZnO NC-SWCNT composite synthesized with a weight ratio of 1:1 (denoted as Z-SWCNTs) was significantly enhanced with respect to NO response and selectivity. This enhanced sensing performance is thought to be a result of both the modulation of the conduction channel at the ZnO NC-SWCNT heterointerfaces and the generation of defects (or holes) by MW irradiation that act as active sites for the target gases. The results obtained in this work provide not only a facile method of cofunctionalizing oxide NCs and defects but also a new methodology for improving the sensing capabilities of SWCNT-based gas sensors.
为了提高基于单壁碳纳米管（SWCNT）的传感器的NO传感性能，采用微波（MW）辅助合成技术对氧化锌（ZnO）纳米团簇（NCs）进行功能化。制备了基于原始SWCNTs和使用不同重量比（ZnO/SWCNTs = 0.5:1、1:1、2:1和3:1）合成的ZnO NC-SWCNT复合材料的气体传感器，并研究了它们在室温（25°C）下对各种气体的传感能力。结果表明，重量比为1:1合成的ZnO NC-SWCNT复合材料（记为Z-SWCNTs）在NO响应和选择性方面的传感性能显著增强。这种增强的传感性能被认为是ZnO NC-SWCNT异质界面处传导通道的调制以及MW辐照产生的缺陷（或空穴）作为目标气体活性位点的结果。这项工作获得的结果不仅提供了一种使氧化物NCs和缺陷共功能化的简便方法，还提供了一种提高基于SWCNT的气体传感器传感能力的新方法。
