Wu Haiyang, Yuan Yubin, Wu Qiang, Bu Xiangrui, Hu Long, Li Xin, Wang Xiaoli, Liu Weihua
Department of Microelectronics, School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, People's Republic of China.
The Key Lab of Micro-Nano Electronics and System Integration of Xi'an City, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China.
Nanotechnology. 2022 Jan 28;33(16). doi: 10.1088/1361-6528/ac49c0.
In order to meet the requirements of ultra-fast real-time monitoring of sarin simulator with high sensitivity and selectivity, it is of great significance to develop high performance dimethyl methylphonate (DMMP) sensor. Herein, we proposed a DMMP sensor based on p-hexafluoroisopropanol phenyl (HFIPPH) modified self-assembled single-walled carbon nanotubes (SWCNTs) with field effect transistor (FET) structure. The self-assembly method provides a 4 nanometres thick and micron sized SWCNT channel, with high selectivity to DMMP. The proposed SWCNTs-HFIPPH based sensor exhibits remarkably higher response to DMMP than bare SWCNT based gas sensor within only few seconds. The gas sensing response of SWCNTs-HFIPPH based sensor for 1 ppm DMMP is 18.2%, and the response time is about 10 s. What's more, the gas sensor we proposed here shows excellent selectivity and reproducibility, and the limitation of detection is as low as ppb level. The proposed method lays the foundation for miniaturization and integration of DMMP sensors, expecting to develop detection system for practical sarin sensing application.
为了满足对沙林模拟剂进行超快速实时监测且具有高灵敏度和选择性的要求，开发高性能的甲基膦酸二甲酯（DMMP）传感器具有重要意义。在此，我们提出了一种基于对六氟异丙醇苯基（HFIPPH）修饰的自组装单壁碳纳米管（SWCNT）且具有场效应晶体管（FET）结构的DMMP传感器。自组装方法提供了一个4纳米厚且微米尺寸的SWCNT通道，对DMMP具有高选择性。所提出的基于SWCNTs-HFIPPH的传感器在短短几秒钟内对DMMP的响应明显高于基于裸SWCNT的气体传感器。基于SWCNTs-HFIPPH的传感器对1 ppm DMMP的气敏响应为18.2%，响应时间约为10秒。此外，我们在此提出的气体传感器具有出色的选择性和重现性，检测限低至ppb水平。所提出的方法为DMMP传感器的小型化和集成奠定了基础，有望开发出用于实际沙林传感应用的检测系统。
