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A novel flexible room temperature ethanol gas sensor based on SnO2 doped poly-diallyldimethylammonium chloride.

Zhan S, Li D, Liang S, Chen X, Li X - Sensors (Basel) (2013)

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Nano-Fabrication and Novel Devices Integrated Technology, Institute of Microelectronics, Chinese Academy of Science, Beijing 100029, China. zhanshuang@ime.ac.cn

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.

No MeSH data available.


Related in: MedlinePlus

The electrostatic interaction between SnO2 and PDDAC. The inset is the chemical structure of PDDAC.
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f9-sensors-13-04378: The electrostatic interaction between SnO2 and PDDAC. The inset is the chemical structure of PDDAC.

Mentions: In order to understand the sensing mechanism of SnO2-PDDAC sensor to ethanol, the following facts should be taken into consideration: (i) particles are likely to acquire surface charges when they are in contact with an aqueous solution [28]; the particles of metal oxide in water become hydroxylated, forming M-OH groups on the surface, which can be ionized to give positive or negative charges, depending on the metal oxide point of zero charge (pzc). Values of pzc for SnO2 are in the 3.5–4.5 range, therefore when dissolved in neutral water, the surface of SnO2 is negatively charged; (ii) PDDAC is a polyelectrolyte with a positive charge located on the quaternary ammonium group (see the inset in Figure 9). Indeed, such an ionizable group dissociates fully in water solutions, releasing counterions (i.e., Cl−), and leaving the positively charged polymer segments [5].


A novel flexible room temperature ethanol gas sensor based on SnO2 doped poly-diallyldimethylammonium chloride.

Zhan S, Li D, Liang S, Chen X, Li X - Sensors (Basel) (2013)

The electrostatic interaction between SnO2 and PDDAC. The inset is the chemical structure of PDDAC.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3673089&req=5

f9-sensors-13-04378: The electrostatic interaction between SnO2 and PDDAC. The inset is the chemical structure of PDDAC.
Mentions: In order to understand the sensing mechanism of SnO2-PDDAC sensor to ethanol, the following facts should be taken into consideration: (i) particles are likely to acquire surface charges when they are in contact with an aqueous solution [28]; the particles of metal oxide in water become hydroxylated, forming M-OH groups on the surface, which can be ionized to give positive or negative charges, depending on the metal oxide point of zero charge (pzc). Values of pzc for SnO2 are in the 3.5–4.5 range, therefore when dissolved in neutral water, the surface of SnO2 is negatively charged; (ii) PDDAC is a polyelectrolyte with a positive charge located on the quaternary ammonium group (see the inset in Figure 9). Indeed, such an ionizable group dissociates fully in water solutions, releasing counterions (i.e., Cl−), and leaving the positively charged polymer segments [5].

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Nano-Fabrication and Novel Devices Integrated Technology, Institute of Microelectronics, Chinese Academy of Science, Beijing 100029, China. zhanshuang@ime.ac.cn

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.

No MeSH data available.


Related in: MedlinePlus