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Yew Hoong Wong - One of the best experts on this subject based on the ideXlab platform.

  • gas sensing properties of zinc stannate zn2sno4 nanowires prepared by carbon assisted thermal Evaporation Process
    Journal of Alloys and Compounds, 2015
    Co-Authors: T Tharsika, A S M A Haseeb, Sheikh A Akbar, Mohd Faizul Mohd Sabri, Yew Hoong Wong
    Abstract:

    Zn2SnO4 nanowires are successfully synthesized by a carbon assisted thermal Evaporation Process with the help of a gold catalyst under ambient pressure. The as-synthesized nanowires are characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM) equipped with an energy dispersive X-ray spectroscopy (EDS). The XRD patterns and elemental mapping via TEM-EDS clearly indicate that the nanowires are Zn2SnO4 with face centered spinel structure. HRTEM image confirms that Zn2SnO4 nanowires are single crystalline with an interplanar spacing of 0.26 nm, which is ascribed to the d-spacing of (3 1 1) planes of Zn2SnO4. The optimum Processing condition and a possible formation mechanism of these Zn2SnO4 nanowires are discussed. Additionally, sensor performance of Zn2SnO4 nanowires based sensor is studied for various test gases such as ethanol, methane and hydrogen. The results reveal that Zn2SnO4 nanowires exhibit excellent sensitivity and selectivity toward ethanol with quick response and recovery times. The response of the Zn2SnO4 nanowires based sensors to 50 ppm ethanol at an optimum operating temperature of 500 degrees C is about 21.6 with response and recovery times of about 116 s and 182 s, respectively. (C) 2014 Elsevier B.V. All rights reserved.

  • gas sensing properties of zinc stannate zn2sno4 nanowires prepared by carbon assisted thermal Evaporation Process
    Journal of Alloys and Compounds, 2015
    Co-Authors: T Tharsika, A S M A Haseeb, Sheikh A Akbar, Mohd Faizul Mohd Sabri, Yew Hoong Wong
    Abstract:

    Abstract Zn 2 SnO 4 nanowires are successfully synthesized by a carbon assisted thermal Evaporation Process with the help of a gold catalyst under ambient pressure. The as-synthesized nanowires are characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM) equipped with an energy dispersive X-ray spectroscopy (EDS). The XRD patterns and elemental mapping via TEM–EDS clearly indicate that the nanowires are Zn 2 SnO 4 with face centered spinel structure. HRTEM image confirms that Zn 2 SnO 4 nanowires are single crystalline with an interplanar spacing of 0.26 nm, which is ascribed to the d-spacing of (3 1 1) planes of Zn 2 SnO 4 . The optimum Processing condition and a possible formation mechanism of these Zn 2 SnO 4 nanowires are discussed. Additionally, sensor performance of Zn 2 SnO 4 nanowires based sensor is studied for various test gases such as ethanol, methane and hydrogen. The results reveal that Zn 2 SnO 4 nanowires exhibit excellent sensitivity and selectivity toward ethanol with quick response and recovery times. The response of the Zn 2 SnO 4 nanowires based sensors to 50 ppm ethanol at an optimum operating temperature of 500 °C is about 21.6 with response and recovery times of about 116 s and 182 s, respectively.

S Chaudhuri - One of the best experts on this subject based on the ideXlab platform.

  • direct synthesis of zno nanowire arrays on zn foil by a simple thermal Evaporation Process
    Nanotechnology, 2008
    Co-Authors: Tandra Ghoshal, Subhajit Biswas, Supriya Chakrabarti, S Chaudhuri
    Abstract:

    ZnO nanowire arrays were synthesized on zinc foil by a simple thermal Evaporation Process at relatively low temperature. Morphology and size controlled synthesis of the ZnO nanostructures was achieved by variation of the synthesis temperature, reaction time and the surface roughness of the substrate. A gas–solid and self-catalytic liquid–solid mechanism is proposed for the growth of nanowires at different temperatures. High-resolution transmission electron microscopy (HRTEM) showed that the as-grown nanowires were of single crystal hexagonal wurtzite structure, growing along the [101] direction. Photoluminescence exhibited strong UV emission at ~382 nm and a broad green emission at ~513 nm with 325 nm excitation. Raman spectroscopy revealed a phonon confinement effect when compared with results from bulk ZnO. The nanowire arrays also exhibited a field emission property.

  • direct synthesis of zno nanowire arrays on zn foil by a simple thermal Evaporation Process
    Nanotechnology, 2008
    Co-Authors: Tandra Ghoshal, Subhajit Biswas, Supriya Chakrabarti, Soumitra Kar, Apurba Dev, S Chaudhuri
    Abstract:

    ZnO nanowire arrays were synthesized on zinc foil by a simple thermal Evaporation Process at relatively low temperature. Morphology and size controlled synthesis of the ZnO nanostructures was achieved by variation of the synthesis temperature, reaction time and the surface roughness of the substrate. A gas–solid and self-catalytic liquid–solid mechanism is proposed for the growth of nanowires at different temperatures. High-resolution transmission electron microscopy (HRTEM) showed that the as-grown nanowires were of single crystal hexagonal wurtzite structure, growing along the [101] direction. Photoluminescence exhibited strong UV emission at ~382 nm and a broad green emission at ~513 nm with 325 nm excitation. Raman spectroscopy revealed a phonon confinement effect when compared with results from bulk ZnO. The nanowire arrays also exhibited a field emission property.

  • shape selective growth of cds one dimensional nanostructures by a thermal Evaporation Process
    Journal of Physical Chemistry B, 2006
    Co-Authors: S Chaudhuri
    Abstract:

    CdS one-dimensional nanoforms such as nanowires, nanoribbons, networklike nanowires, pearl necklace type nanowires, helical-like nanowires, and nanowire arrays were formed on Si substrates by a simple thermal Evaporation route. The shapes of the one-dimensional CdS nanoforms were controlled by varying the experimental parameters such as temperature and position of the substrates. Formation of the CdS one-dimensional nanoforms was initiated by the Au catalyzed vapor−liquid−solid technique, whereas the vapor−solid Process played a crucial role in defining the shapes of the nanoforms. Different optical characterizations such as optical absorbance, photoluminescence, and Raman spectroscopy were adopted to explore the physical and structural quality of these CdS nanoforms.

T Tharsika - One of the best experts on this subject based on the ideXlab platform.

  • gas sensing properties of zinc stannate zn2sno4 nanowires prepared by carbon assisted thermal Evaporation Process
    Journal of Alloys and Compounds, 2015
    Co-Authors: T Tharsika, A S M A Haseeb, Sheikh A Akbar, Mohd Faizul Mohd Sabri, Yew Hoong Wong
    Abstract:

    Zn2SnO4 nanowires are successfully synthesized by a carbon assisted thermal Evaporation Process with the help of a gold catalyst under ambient pressure. The as-synthesized nanowires are characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM) equipped with an energy dispersive X-ray spectroscopy (EDS). The XRD patterns and elemental mapping via TEM-EDS clearly indicate that the nanowires are Zn2SnO4 with face centered spinel structure. HRTEM image confirms that Zn2SnO4 nanowires are single crystalline with an interplanar spacing of 0.26 nm, which is ascribed to the d-spacing of (3 1 1) planes of Zn2SnO4. The optimum Processing condition and a possible formation mechanism of these Zn2SnO4 nanowires are discussed. Additionally, sensor performance of Zn2SnO4 nanowires based sensor is studied for various test gases such as ethanol, methane and hydrogen. The results reveal that Zn2SnO4 nanowires exhibit excellent sensitivity and selectivity toward ethanol with quick response and recovery times. The response of the Zn2SnO4 nanowires based sensors to 50 ppm ethanol at an optimum operating temperature of 500 degrees C is about 21.6 with response and recovery times of about 116 s and 182 s, respectively. (C) 2014 Elsevier B.V. All rights reserved.

  • gas sensing properties of zinc stannate zn2sno4 nanowires prepared by carbon assisted thermal Evaporation Process
    Journal of Alloys and Compounds, 2015
    Co-Authors: T Tharsika, A S M A Haseeb, Sheikh A Akbar, Mohd Faizul Mohd Sabri, Yew Hoong Wong
    Abstract:

    Abstract Zn 2 SnO 4 nanowires are successfully synthesized by a carbon assisted thermal Evaporation Process with the help of a gold catalyst under ambient pressure. The as-synthesized nanowires are characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM) equipped with an energy dispersive X-ray spectroscopy (EDS). The XRD patterns and elemental mapping via TEM–EDS clearly indicate that the nanowires are Zn 2 SnO 4 with face centered spinel structure. HRTEM image confirms that Zn 2 SnO 4 nanowires are single crystalline with an interplanar spacing of 0.26 nm, which is ascribed to the d-spacing of (3 1 1) planes of Zn 2 SnO 4 . The optimum Processing condition and a possible formation mechanism of these Zn 2 SnO 4 nanowires are discussed. Additionally, sensor performance of Zn 2 SnO 4 nanowires based sensor is studied for various test gases such as ethanol, methane and hydrogen. The results reveal that Zn 2 SnO 4 nanowires exhibit excellent sensitivity and selectivity toward ethanol with quick response and recovery times. The response of the Zn 2 SnO 4 nanowires based sensors to 50 ppm ethanol at an optimum operating temperature of 500 °C is about 21.6 with response and recovery times of about 116 s and 182 s, respectively.

Chihwei Chu - One of the best experts on this subject based on the ideXlab platform.

  • realization of in2o3 thin film transistors through reactive Evaporation Process
    Applied Physics Letters, 2007
    Co-Authors: Chihwei Chu
    Abstract:

    In2O3 thin films have been grown by reactive Evaporation of indium in ambient oxygen. The films were structurally characterized by x-ray diffraction (XRD) and atomic force microscopy techniques. The results of XRD revealed that the films were polycrystalline in nature with preferred (222) orientation. The as-grown films were subjected to various annealing treatments to modulate the conductivity of the films for thin film transistors (TFTs). TFTs fabricated on SiO2 gate dielectric exhibited an on/off ratio of 104 and a field-effect mobility of 27cm2∕Vs. High on-state current makes them potential candidates for flat-panel display devices.

Sheikh A Akbar - One of the best experts on this subject based on the ideXlab platform.

  • gas sensing properties of zinc stannate zn2sno4 nanowires prepared by carbon assisted thermal Evaporation Process
    Journal of Alloys and Compounds, 2015
    Co-Authors: T Tharsika, A S M A Haseeb, Sheikh A Akbar, Mohd Faizul Mohd Sabri, Yew Hoong Wong
    Abstract:

    Zn2SnO4 nanowires are successfully synthesized by a carbon assisted thermal Evaporation Process with the help of a gold catalyst under ambient pressure. The as-synthesized nanowires are characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM) equipped with an energy dispersive X-ray spectroscopy (EDS). The XRD patterns and elemental mapping via TEM-EDS clearly indicate that the nanowires are Zn2SnO4 with face centered spinel structure. HRTEM image confirms that Zn2SnO4 nanowires are single crystalline with an interplanar spacing of 0.26 nm, which is ascribed to the d-spacing of (3 1 1) planes of Zn2SnO4. The optimum Processing condition and a possible formation mechanism of these Zn2SnO4 nanowires are discussed. Additionally, sensor performance of Zn2SnO4 nanowires based sensor is studied for various test gases such as ethanol, methane and hydrogen. The results reveal that Zn2SnO4 nanowires exhibit excellent sensitivity and selectivity toward ethanol with quick response and recovery times. The response of the Zn2SnO4 nanowires based sensors to 50 ppm ethanol at an optimum operating temperature of 500 degrees C is about 21.6 with response and recovery times of about 116 s and 182 s, respectively. (C) 2014 Elsevier B.V. All rights reserved.

  • gas sensing properties of zinc stannate zn2sno4 nanowires prepared by carbon assisted thermal Evaporation Process
    Journal of Alloys and Compounds, 2015
    Co-Authors: T Tharsika, A S M A Haseeb, Sheikh A Akbar, Mohd Faizul Mohd Sabri, Yew Hoong Wong
    Abstract:

    Abstract Zn 2 SnO 4 nanowires are successfully synthesized by a carbon assisted thermal Evaporation Process with the help of a gold catalyst under ambient pressure. The as-synthesized nanowires are characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM) equipped with an energy dispersive X-ray spectroscopy (EDS). The XRD patterns and elemental mapping via TEM–EDS clearly indicate that the nanowires are Zn 2 SnO 4 with face centered spinel structure. HRTEM image confirms that Zn 2 SnO 4 nanowires are single crystalline with an interplanar spacing of 0.26 nm, which is ascribed to the d-spacing of (3 1 1) planes of Zn 2 SnO 4 . The optimum Processing condition and a possible formation mechanism of these Zn 2 SnO 4 nanowires are discussed. Additionally, sensor performance of Zn 2 SnO 4 nanowires based sensor is studied for various test gases such as ethanol, methane and hydrogen. The results reveal that Zn 2 SnO 4 nanowires exhibit excellent sensitivity and selectivity toward ethanol with quick response and recovery times. The response of the Zn 2 SnO 4 nanowires based sensors to 50 ppm ethanol at an optimum operating temperature of 500 °C is about 21.6 with response and recovery times of about 116 s and 182 s, respectively.