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Author: search.filters.author.Techitdheera, W.Subject: search.filters.subject.co-precipitation

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    Characterization and phase formation study of ZnO:Sn nanoparticles synthesized by co-precipitation method
    (2014-09-02)
    Noonuruk, R.
    ;
    Mekprasart, W.
    ;
    Supparattanasamai, T.
    ;
    Kanyapan, T.
    ;
    Techitdheera, W.
    ZnO:Sn were successfully prepared by co-precipitation method using zinc acetate dihydrate and tin (IV) chloride hexahydrate as host and dopant precursor sources, respectively. The ratio of Sn doping content in ZnO was designated at 0, 5, 10 and 20 wt.% and calcined at different temperatures at 200, 300, 400 and 500°C. Physical properties and composition of Sn-doped ZnO powder were monitored by X-ray diffraction and scanning electron microscope. Chemical bonding of as-synthesized powders were investigated by Fourier transform spectroscopy. The preliminary results indicate that the crystallinity and morphologies of ZnO nanoparticle are significantly affected by Sn dopant. The phase formation of Zn-Sn-O was observed depending on the Sn-doping composition and calcination temperature. Meanwhile, FTIR results indicate the existence of mixture phases of ZnO:Sn in the compounds which were obtained via precipitation process. © 2014 Taylor & Francis Group, LLC.
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    Structural and optical properties of Cu-doped ZnO nanoparticles synthesized by co-precipitation method for solar energy harvesting application
    (2013-03-13)
    Thaweesaeng, N.
    ;
    Suphankij, S.
    ;
    Pecharapa, W.
    ;
    Techitdheera, W.
    Cu-doped ZnO nanoparticles were synthesized by co-precipitation method using zinc nitrate (Zn(NO<inf>3</inf>)<inf>2</inf>-6H<inf>2</inf>O), copper(II) nitrate trihydrate (Cu(NO<inf>3</inf>)<inf>2</inf>-3 H<inf>2</inf>O) as starting precursors for Zn and Cu sources, respectively. The structural properties of powders were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM) and X-ray Photoelectron Spectroscopy (XPS). The XRD results disclose that Cu-doped ZnO nanopowders are in hexagonal wurtzite structure and their crystallinities are deteriorated with increasing Cu doping content. Meanwhile, XPS results indicate the existence of Cu ion with relevant electronic state in ZnO. Optical properties of the samples were investigated by mean of their absorption and the results suggest that Cu additive has significant effects on their crucial optical properties that can be tuned to meet the requirement for practical solar energy harvesting applications such as sun-light photocatalyst and photovoltaic devices. © 2013 IEEE.