Chen Yuxi, Zhang Wenqian, She Changkun, Li Guishun, Zhang Lihua, Liu Shaohua, Cheng Ya, Jing Chengbin, Chu Junhao
Engineering Research Center for Nanophotonics and Advanced Instrument, Ministry of Education, Department of Materials, School of Physics and Electronic Science, East China Normal University 500 Dongchuan Road Shanghai 200241 China
Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Materials, School of Physics and Electronic Science, East China Normal University 500 Dongchuan Road Shanghai 200241 China.
RSC Adv. 2019 Nov 8;9(62):36351-36357. doi: 10.1039/c9ra04687a. eCollection 2019 Nov 4.
A sodium citrate (SC) doped polypyrrole (PPy)/PS capillary sensor was prepared for ultra-small volume HCl gas detection. A PS film was formed in advance on the inner wall of a silica glass capillary tube, which enabled us to prepare a high-qualified PPy sensitive film inside the tube. The crystallinity, morphology, microstructure and carrier transport properties of the PPy film were characterized by XRD, SEM, FTIR and Hall effect system, respectively. The results indicated that the as-prepared tube sensor sample was able to detect 0.2 mL 30 ppm HCl gas while the plane-shaped PPy/PS sensor failed to probe. The improvement of sensing properties was attributed to the trend of crystallinity, pore (or gap) morphology and the long-narrow gas cell. The tube-like gas cell and the featured PPy/PS film of the tube sample contribute to sensing the small volume of HCl gas, which may be applied in breath analysis for potential nonintrusive disease diagnosis.
制备了一种柠檬酸钠（SC）掺杂的聚吡咯（PPy）/聚苯乙烯（PS）毛细管传感器，用于超小体积HCl气体检测。预先在石英玻璃毛细管内壁形成PS膜，这使我们能够在管内制备高质量的PPy敏感膜。分别采用X射线衍射（XRD）、扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）和霍尔效应系统对PPy膜的结晶度、形态、微观结构和载流子传输特性进行了表征。结果表明，所制备的管式传感器样品能够检测0.2 mL 30 ppm的HCl气体，而平面型PPy/PS传感器则无法检测。传感性能的提高归因于结晶度趋势、孔隙（或间隙）形态和狭长气室。管状气室和管式样品具有特色的PPy/PS膜有助于检测小体积的HCl气体，这可能应用于呼气分析以进行潜在的非侵入性疾病诊断。
