The detection and control of nitrogen oxides (NOX) in exhaust gases emitted by combustion engines has been an important subject in the last decades. Regulations of vehicle emissions focus on the minimization of NOX in automotive exhaust gases, particularly in lean combustion exhaust gases. Fast response times and high sensitivity of NOX sensor in lean combustion environments are necessary to meet those regulations. In this paper a new sensing material (In1.82 Ni0.18 O3 nanofibers) was synthesized via a simple and effective electrospinning method. The morphology and crystal structure of the as-prepared samples were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectra (XPS). Potentiometric-type NOX sensor based on yttria-stabilized zirconia (YSZ) with In1.82 Ni0.18 O3 nanofibers sensing electrode was prepared and its gas sensing properties were also tested. The results show that large-scale In1.82 Ni0.18 O3 nanofibers with diameters ranging from 40 to 80 nm and lengths of several tens of micrometers were successfully synthesized by this technique. A loose reticular porous non-woven lap structure was formed by many fibers. The results of sensing tests show that the sensitivity ΔEMF of sensor prepared can reach 85 mV for 500 ppm NO, and the ΔEMF is stable. Moreover, the sensor also exhibited fast response time and good selectivity.


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    Synthesis and Nox Gas Sensing Properties of In1.82 ni0.18o3 Electrospun Nanofibers

    Wang, Jinxing / Zhang, Kejin / Wang, Dan et al. | Springer Verlag | 2012


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