A Novel Flexible Room Temperature Ethanol Gas Sensor Based on SnO2 Doped Poly-Diallyldimethylammonium Chloride

Sensors

Shuang Zhan¹  Dongmei Li¹  Shengfa Liang¹  Xin Chen¹ 

[1] Key Laboratory of Nano-Fabrication and Novel Devices Integrated Technology, Institute of Microelectronics, Chinese Academy of Science, Beijing 100029, China; E-Mails:

关键词: flexible;    ethanol gas sensor;    SnO₂;    PDDAC;    room temperature;   

DOI  :  10.3390/s130404378

来源: mdpi

【 摘 要 】

A novel flexible room temperature ethanol gas sensor was fabricated and demonstrated in this paper. The polyimide (PI) substrate-based sensor was formed by depositing a mixture of SnO₂ nanopowder and poly-diallyldimethylammonium chloride (PDDAC) on as-patterned interdigitated electrodes. PDDAC acted both as the binder, promoting the adhesion between SnO₂ and the flexible PI substrate, and the dopant. We found that the response of SnO₂-PDDAC sensor is significantly higher than that of SnO₂ alone, indicating that the doping with PDDAC effectively improved the sensor performance. The SnO₂-PDDAC sensor has a detection limit of 10 ppm at room temperature and shows good selectivity to ethanol, making it very suitable for monitoring drunken driving. The microstructures of the samples were examined by scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscope (TEM) and Fourier transform infrared spectra (FT-IR), and the sensing mechanism is also discussed in detail.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.