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Abstract: Pure and Cu-doped SnO2 nanofibers are synthesized via a simple electrospinning method, and characterized by transmission electron microscopy and X-ray diffraction. The sensor fabricated from Cu-doped SnO2 nanofibers exhibits improved sensing properties to ethanol at 300°C. The sensitivity is up to 3 when this sensor is exposed to 5ppm ethanol. The response and recovery times are about 1 and 10s, respectively. The linear dependence of the sensitivity on the ethanol concentration is observed in the range of 5–500ppm. Good selectivity is also observed in our studies. The results make Cu-doped SnO2 nanofibers good candidates for fabricating high performance ethanol sensors. [Copyright &y& Elsevier]

Abstract: Na2Ti3O7 nanowires with diameters of about 80-130 nm and lengths up to several tens of micrometers are synthesized via a simple hydrothermal method and characterized by the field-emission scanning electron microscopy and X-ray diffraction. Back-gate field-effect transistors based on these nanowires are fabricated on indium tin oxide glass substrates with polymethyl-methacrylate-co-glyciclyl-methacrylate as the gate insulator layers. Typical p-type semiconductor material properties are observed in our investigations. The field-effect mobility is about 0.1 cm2/Vs. The capacitance per unit area of the dielectric is 3.43 nF/cm2 (dielectric constant, k=3.9). The on/off ratio is around 103 at the conduction of 10 V. [Copyright &y& Elsevier]

Abstract: Uniaxially aligned Ba0.8Sr0.2TiO3 (BST) nanofiber arrays were fabricated via electrospinning combined with annealing. A specially designed collector composed of two paralleled aluminum electrodes and an insulative substrate were used in the electrospinning process. The morphology and structure of the resultant arrays were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The SEM shows well uniaxial arrangement and the diameters before (300–500nm) and after (100nm) calcination. XRD shows well-defined perovskite crystal structure of the as-synthesized arrays. The humidity sensor based on the as-synthesized arrays exhibited a rapid response-recovery property at room temperature. The possible sensing mechanism was proposed. [Copyright &y& Elsevier]

Abstract: Ba0.8Sr0.2TiO3/Poly (vinylpyrrolidone) (BST/PVP) composite fibers were successfully synthesized via electrospinning. The ceramic nanofibers were obtained after calcining the composite at 800°C for 2h. The morphology and structure of the BST fibers were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results reveal that the as-synthesized BST nanofibers show a diameter of 50–150nm with the length over 0.1mm, and a well-defined perovskite crystal structure. The electrical properties of the as-synthesized BST nanofibers were investigated through an impedance-type humidity sensor. The nanofibers exhibited excellent humidity sensing properties at room temperature. The possible sensing mechanism was proposed. [Copyright &y& Elsevier]