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A Novel Flexible Room Temperature Ethanol Gas Sensor Based on SnO2 Doped Poly-Diallyldimethylammonium Chloride
Key Laboratory of Nano-Fabrication and Novel Devices Integrated Technology, Institute of Microelectronics, Chinese Academy of Science, Beijing 100029, China
College of Materials Science and Technology, Qing Dao University of Science &Technology, Qingdao 266042, China
* Authors to whom correspondence should be addressed.
Received: 1 March 2013; in revised form: 26 March 2013 / Accepted: 27 March 2013 / Published: 2 April 2013
Abstract: 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.
Keywords: flexible; ethanol gas sensor; SnO2; PDDAC; room temperature
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Zhan, S.; Li, D.; Liang, S.; Chen, X.; Li, X. A Novel Flexible Room Temperature Ethanol Gas Sensor Based on SnO2 Doped Poly-Diallyldimethylammonium Chloride. Sensors 2013, 13, 4378-4389.
Zhan S, Li D, Liang S, Chen X, Li X. A Novel Flexible Room Temperature Ethanol Gas Sensor Based on SnO2 Doped Poly-Diallyldimethylammonium Chloride. Sensors. 2013; 13(4):4378-4389.
Zhan, Shuang; Li, Dongmei; Liang, Shengfa; Chen, Xin; Li, Xia. 2013. "A Novel Flexible Room Temperature Ethanol Gas Sensor Based on SnO2 Doped Poly-Diallyldimethylammonium Chloride." Sensors 13, no. 4: 4378-4389.