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Jianfang Wang – One of the best experts on this subject based on the ideXlab platform.

Tian Ming – One of the best experts on this subject based on the ideXlab platform.

  • Aerosol Spray diverse mesoporous metal oxides from metal nitrates
    Scientific Reports, 2015
    Co-Authors: Long Kuai, Baoyou Geng, Junxin Wang, Tian Ming, Caihong Fang, Jianfang Wang
    Abstract:

    Transition metal oxides are widely used in solar cells, batteries, transistors, memories, transparent conductive electrodes, photocatalysts, gas sensors, supercapacitors, and smart windows. In many of these applications, large surface areas and pore volumes can enhance molecular adsorption, facilitate ion transfer, and increase interfacial areas; the formation of complex oxides (mixed, doped, multimetallic oxides and oxide-based hybrids) can alter electronic band structures, modify/enhance charge carrier concentrations/separation, and introduce desired functionalities. A general synthetic approach to diverse mesoporous metal oxides is therefore very attractive. Here we describe a powerful AerosolSpray method for synthesizing various mesoporous metal oxides from low-cost nitrate salts. During Spray, thermal heating of precursor droplets drives solvent evaporation and induces surfactant-directed formation of mesostructures, nitrate decomposition and oxide cross-linking. Thirteen types of monometallic oxides and four groups of complex ones are successfully produced, with mesoporous iron oxide microspheres demonstrated for photocatalytic oxygen evolution and gas sensing with superior performances.

  • ultrasonic Aerosol Spray assisted preparation of tio2 in2o3 composite for visible light driven photocatalysis
    Journal of Catalysis, 2014
    Co-Authors: Tian Ming, Junxin Wang, Jianfang Wang
    Abstract:

    A TiO2/In2O3 composite photocatalyst has been prepared by using a facile ultrasonic Aerosol Spray (UAS)-assisted method. Results from scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDX), powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and N2 adsorption–desorption measurements reveal that the as-prepared TiO2/In2O3 composite exhibits a porous structure and spherical morphology. The diameter ranges from tens of nanometers to several micrometers. According to the UV–vis diffuse reflectance spectra, the TiO2/In2O3 composite shows good visible-light absorption ability. The photocatalytic activity of the samples was evaluated by the decomposition of organic dyes in aqueous solutions under visible-light irradiation. All the composite samples show excellent photocatalytic performance. The effect of In2O3 content on the photocatalytic activity was also investigated. The best photocatalytic activity results from the TiO2/In2O3 sample with Ti:In molar ratio of 100:1. The UAS-assisted method can also be applied for the preparation of other composite semiconductor materials. It provides a general approach for scaling up the production of photocatalysts for practical applications.

  • Ultrasonic Aerosol Spray-assisted preparation of TiO2/In2O3 composite for visible-light-driven photocatalysis
    Journal of Catalysis, 2014
    Co-Authors: Tian Ming, Junxin Wang, Jianfang Wang
    Abstract:

    A TiO2/In2O3 composite photocatalyst has been prepared by using a facile ultrasonic Aerosol Spray (UAS)-assisted method. Results from scanning electron microscopy (SEM), high-resolution transmission elecelectron microscopy (HRTEM), energy-dispersive X-ray specspectroscopy (EDX), powder X-ray diffraction (XRD), X-ray photoelectron specspectroscopy (XPS), and N2 adsorption–desorption measurements reveal that the as-prepared TiO2/In2O3 composite exhibits a porous structure and spherical morphology. The diameter ranges from tens of nanometers to several micrometers. According to the UV–vis diffuse reflreflectance spectra, the TiO2/In2O3 composite shows good visible-light absorption ability. The photocatalytic activity of the samples was evaluated by the decomposition of organic dyes in aqueous solutions under visible-light irradiation. All the composite samples show excellent photocatalytic performance. The effect of In2O3 content on the photocatalytic activity was also investigated. The best photocatalytic activity results from the TiO2/In2O3 sample with Ti:In molar ratio of 100:1. The UAS-assisted method can also be applied for the preparation of other composite semiconductor materials. It provides a general approach for scaling up the production of photocatalysts for practical applications.

George Kiriakidis – One of the best experts on this subject based on the ideXlab platform.

  • Vanadium oxide nanostructured thin films prepared by Aerosol Spray Pyrolysis for gas sensing and thermochromic applications
    Materials Science in Semiconductor Processing, 2019
    Co-Authors: S. Gavalas, George Kiriakidis, E. Gagaoudakis, D. Katerinopoulou, V. Petromichelaki, S. Wight, G. Wotring, E. Aperathitis, Vassilios Binas
    Abstract:

    Abstract Vanadium oxide (VxOy) nanostructured films were prepared by Aerosol Spray Pyrolysis technique with different concentrations of precursor solution (0.005 M, 0.01 M, 0.02 M), using ammonium metavanadate (NH4VO3) as precursor. The deposition was carried out onto glass substrates (Corning glass) at two different substrate temperatures (300 °C and 400 °C). Furthermore, oxalic acid was added to the precursor solution in order to grow the thermochromic VO2(M) monoclinic phase via reduction of the Vanadium oxides in which Vanadium is in a higher oxidizing state. All films were characterized by X-Ray Diffraction technique and UV/Vis/NIR spectroscopy to identify their structural and optical properties, respectively. V2O5 films were tested against ozone, having a sensitivity of 29% in ultra-low concentration of 5ppb ozone, at room temperature. Moreover, nanostructured VO2 films appeared to be thermochromic, having an IR-switching of about 5% at λ = 2500 nm, upon heating.

  • A study on the sensing of NO2 and O2 utilizing ZnO films grown by Aerosol Spray pyrolysis
    Materials Chemistry and Physics, 2015
    Co-Authors: G.h. Mhlongo, Ioannis Kortidis, David E. Motaung, Bonex W. Mwakikunga, Suprakas Sinha Ray, Ntombizodwa R. Mathe, Odireleng M. Ntwaeaborwa, H.c. Swart, George Kiriakidis
    Abstract:

    Abstract The present paper addresses the preparation and characterization of ZnO nanostructured thin films obtained using Aerosol Spray pyrolysis method at different deposition periods. Aiming at understanding the chemical composition, structural and morphological properties of the samples, characterization was performed using X-ray photoelectron specspectroscopy (XPS), X-ray diffraction (XRD), atomic force microscopy (AFM) and focused ion beam scanning electron microscopy (FIB-SEM), respectively. Defect structures were characterized by photoluminescence (PL), Raman, and electron paramagnetic resoresonance (EPR) techniques. The purity and crystallinity of the deposited films with increasing growth time were confirmed from XRD studies supported by Raman studies. AFM and SEM revealed morphology transition from uniform small particles to rod-like structures fused together growing perpendicular to the surface with prolonged deposition time. Optical absorption analyses revealed the decrease in the optical band-gap energy from 3.38 to 3.27 eV with prolonged growth time. The dominant emission at 2.80 eV (445 nm) in the PL spectra signifies the presence of Zni in the ZnO nanostructures which is shown to slightly decrease with an increase in growth time. EPR analyses revealed higher ferromagnetic (FM) signal for ZnO films grown for 20 min. Improved sensitivity to both NO2 and O2 was observed for ZnO nanostructured film grown for 20 min owing to higher Zni and VO as compared to its counterpart. Film grown for longer periods showed a decrease on the FM and sensitivity due to reduced Zni and VO defects induced by larger grain sizes.

  • Structural and optical properties of ZnO nanostructures grown by Aerosol Spray pyrolysis: Candidates for room temperature methane and hydrogen gas sensing
    Applied Surface Science, 2013
    Co-Authors: David E. Motaung, Ioannis Kortidis, S.s. Nkosi, Gerald F. Malgas, Bonex W. Mwakikunga, G.h. Mhlongo, Suprakas Sinha Ray, George Kiriakidis
    Abstract:

    Abstract We report on the synthesis of ZnO films by Aerosol Spray pyrolysis method at different deposition times. The surface morphology, crystal structure and the cross-sectional analysis of the prepared ZnO films were characterized by X-ray diffraction (XRD), focused ion beam scanning electron microscopy (FIB-SEM), atomic force microscopy (AFM) and high resolution transmission elecelectron microscopy (HR-TEM). XRD analysis revealed that the ZnO films are polycrystalline in nature. Structural analysis exploiting cross-sectional TEM profile showed that the films composed of nano-particles and columnar structures growing perpendicular to the substrate. AFM revealed that the columnar structures have a higher surface roughness as compared to the nanoparticles. The effect of ZnO crystallite size and crystallinity on the gas sensing performance of hydrogen and methane gases was also evaluated. Sensing film based on ZnO nanoparticles has numerous advantages in terms of its reliability and high sensitivity. These sensing materials revealed an improved response to methane and hydrogen gases at room temperature due to their high surface area, indicating their possible application as a gas sensor.

Junxin Wang – One of the best experts on this subject based on the ideXlab platform.

  • Aerosol Spray diverse mesoporous metal oxides from metal nitrates
    Scientific Reports, 2015
    Co-Authors: Long Kuai, Baoyou Geng, Junxin Wang, Tian Ming, Caihong Fang, Jianfang Wang
    Abstract:

    Transition metal oxides are widely used in solar cells, batteries, transistors, memories, transparent conductive electrodes, photocatalysts, gas sensors, supercapacitors, and smart windows. In many of these applications, large surface areas and pore volumes can enhance molecular adsorption, facilitate ion transfer, and increase interfacial areas; the formation of complex oxides (mixed, doped, multimetallic oxides and oxide-based hybrids) can alter electronic band structures, modify/enhance charge carrier concentrations/separation, and introduce desired functionalities. A general synthetic approach to diverse mesoporous metal oxides is therefore very attractive. Here we describe a powerful AerosolSpray method for synthesizing various mesoporous metal oxides from low-cost nitrate salts. During Spray, thermal heating of precursor droplets drives solvent evaporation and induces surfactant-directed formation of mesostructures, nitrate decomposition and oxide cross-linking. Thirteen types of monometallic oxides and four groups of complex ones are successfully produced, with mesoporous iron oxide microspheres demonstrated for photocatalytic oxygen evolution and gas sensing with superior performances.

  • ultrasonic Aerosol Spray assisted preparation of tio2 in2o3 composite for visible light driven photocatalysis
    Journal of Catalysis, 2014
    Co-Authors: Tian Ming, Junxin Wang, Jianfang Wang
    Abstract:

    A TiO2/In2O3 composite photocatalyst has been prepared by using a facile ultrasonic Aerosol Spray (UAS)-assisted method. Results from scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDX), powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and N2 adsorption–desorption measurements reveal that the as-prepared TiO2/In2O3 composite exhibits a porous structure and spherical morphology. The diameter ranges from tens of nanometers to several micrometers. According to the UV–vis diffuse reflectance spectra, the TiO2/In2O3 composite shows good visible-light absorption ability. The photocatalytic activity of the samples was evaluated by the decomposition of organic dyes in aqueous solutions under visible-light irradiation. All the composite samples show excellent photocatalytic performance. The effect of In2O3 content on the photocatalytic activity was also investigated. The best photocatalytic activity results from the TiO2/In2O3 sample with Ti:In molar ratio of 100:1. The UAS-assisted method can also be applied for the preparation of other composite semiconductor materials. It provides a general approach for scaling up the production of photocatalysts for practical applications.

  • Ultrasonic Aerosol Spray-assisted preparation of TiO2/In2O3 composite for visible-light-driven photocatalysis
    Journal of Catalysis, 2014
    Co-Authors: Tian Ming, Junxin Wang, Jianfang Wang
    Abstract:

    A TiO2/In2O3 composite photocatalyst has been prepared by using a facile ultrasonic Aerosol Spray (UAS)-assisted method. Results from scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDX), powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and N2 adsorption–desorption measurements reveal that the as-prepared TiO2/In2O3 composite exhibits a porous structure and spherical morphology. The diameter ranges from tens of nanometers to several micrometers. According to the UV–vis diffuse reflectance spectra, the TiO2/In2O3 composite shows good visible-light absorption ability. The photocatalytic activity of the samples was evaluated by the decomposition of organic dyes in aqueous solutions under visible-light irradiation. All the composite samples show excellent photocatalytic performance. The effect of In2O3 content on the photocatalytic activity was also investigated. The best photocatalytic activity results from the TiO2/In2O3 sample with Ti:In molar ratio of 100:1. The UAS-assisted method can also be applied for the preparation of other composite semiconductor materials. It provides a general approach for scaling up the production of photocatalysts for practical applications.

David Grosso – One of the best experts on this subject based on the ideXlab platform.