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Author: search.filters.author.Pecharapa, W.Subject: search.filters.subject.Co-precipitation

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    Physical properties of Ti-doped ITO nanoparticles synthesized by co-precipitation method
    (2016-04-26)
    Chongsri, K.
    ;
    Kanoksinwuttipong, J.
    ;
    Techitdheera, W.
    ;
    Pecharapa, W.
    Ti-doped indium tin oxide (ITO) nanoparticles (TITO) with different molar ratios of Ti:ITO were synthesized by co-precipitation method using Ti(OCH2CH2CH2CH3)4, InCl3 and SnCl4·5H2O as starting precursors. Deionized (DI) water was selected as the solvent in this process. The as-precipitated powders were calcined at different temperature in range of 700 °C for 2 h. For all samples, their crystal structures, Optical property and morphologies were investigated by X-ray diffraction (XRD), UV-Vis absorption spectroscopy and Scanning electron microscope (SEM), respectively. XRD results reveal that the purity of as-synthesized sample is increased by the increase of calcination temperatures. Moreover, it is noticed that the incorporation of Ti into ITO matrix significantly affects to their relevant physical properties especially optical properties. In addition, SEM micrographs show that the sample agglomeration is noticeably influenced by Ti doping content.
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    Characterisation of Ti-doped indium tin oxide nanoparticles synthesised by co-precipitation process
    (2016-01-01)
    Chongsri, K.
    ;
    Kanoksinwuttipong, J.
    ;
    Techitdheera, W.
    ;
    Pecharapa, W.
    Ti-doped indium tin oxide (ITO) nanoparticles (TITO) with different molar ratios of Ti:ITO were synthesised by co-precipitation method using Ti(OCH<inf>2</inf>CH<inf>2</inf>CH<inf>2</inf>CH<inf>3</inf>)<inf>4</inf>, InCl<inf>3</inf> and SnCl<inf>4</inf>·5H<inf>2</inf>O as starting precursors. Deionised (DI) water was selected as the solvent in this process. The as-precipitated powders were calcined at different temperatures around 700°C for 2 h. For all samples, their crystal structures, optical properties and morphologies were investigated by X-ray diffraction (XRD), UV-Vis absorption spectroscopy, scanning electron microscope (SEM), and transmission electron microscope (TEM), respectively. XRD results reveal that the purity of as-synthesised samples is increased with the increase of calcination temperatures. Relevant mechanisms involved in the synthesis via precipitation process are discussed. It is noticed that the incorporation of Ti into ITO matrix significantly affects the relevant physical properties and optical properties.
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    Structural Properties of Ga-Doped ZnO Nanoparticles Synthesized by Co-Precipitation Process
    (2015-09-02)
    Chongsri, K.
    ;
    Pecharapa, W.
    Ga-doped ZnO (GZO) nanoparticles were synthesized by co-precipitation process from starting precursors zinc dichloride (ZnCl2) and Gallium (III) nitrate hydrate (GaN3O9). The deionized (DI) water was selected as the solvent. The as-precipitated powders were calcined at different temperature of 700 and 1000 °C for 2 h. For all samples, their crystal structures were investigated by X-ray diffraction (XRD) and surface morphologies were observed by a field emission scanning electron microscope (FE-SEM). The XRD results revealed that, the crystallinity of powders increases when the calcination temperature increases. Moreover, it is noticed that the intermixture phases of ZnO and Ga2O3 occur when the Ga doping content is exceeded the solubility limit of about 10%. In addition, SEM micrographs show the decrease of particle size with increasing Ga doping content due to lattice distortion that can hinder the crystal growth of ZnO. © 2015
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    Structural, optical and photo catalytic properties of Cu-doped ZnO nanoparticles synthesised by co-precipitation method
    (2014-01-01)
    Thaweesaeng, N.
    ;
    Suphankij, S.
    ;
    Techitdheera, W.
    ;
    Pecharapa, W.
    In this work, co-precipitation method was utilised to synthesise Cu-doped ZnO nanoparticles using zinc nitrate (Zn(NO<inf>3</inf>)2·6H <inf>2</inf>O), and copper(II) nitrate trihydrate (Cu(NO<inf>3</inf>)2·3 H<inf>2</inf>O) as starting precursors for Zn and Cu sources, respectively. Structural and physical properties of as-prepared powders were examined by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), X-ray Photoelectron Spectroscopy (XPS) and X-ray absorption near edge spectroscopy (XANES). The XRD results reveal that Cu-doped ZnO nanopowders are in hexagonal wurtzite structure and their crystallinity deteriorates with increasing Cu doping content. FTIR results additionally show the existence of relevant chemical bonding in the samples. Meanwhile, XPS and XANES results indicate the existence of Cu ion with relevant electronic state in ZnO. Optical properties of the samples were investigated and the corresponding results suggest that Cu additive plays a crucial role in their optical properties that can be adjusted to meet the requirement for practical solar energy harvesting applications such as sun-light photocatalyst. The photocatalytic activity of as-prepared Cu-doped ZnO photocatalyst was investigated by the degradation of Rhodamine B solution. The catalyst with 6% Cu doping content exhibits the enhancement in photocatalytic activity with reaction rate of 0.0267 min-1. The significant improvement in photocatalytic activity of the doped sample may be associated to the increase of functional hydroxyl radicals due to the incorporation of specific content Cu dopant. Copyright © 2014 Inderscience Enterprises Ltd.
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    Effect of tin loading on physical properties and phase transformation of as-synthesized Zn-Sn-O compound powder synthesized by co-precipitation method
    (2014-01-01)
    Kahattha, C.
    ;
    Chongsri, K.
    ;
    Noonuruk, R.
    ;
    Mekprasart, W.
    ;
    Pecharapa, W.
    Zinc-Tin oxide compounds (Zn-Sn-O) were successfully prepared via a facile co-precipitation process using zinc dichloride dihydrate as the zinc source and tin tetrachloride pentahydrate as an additive source. The as-prepared product of Zn-Sn-O powders with various Sn additive contents (0-60 %wt) were obtained without calcinations process. The effect of Sn additive on structural and microstructure properties of the samples were characterized by X-ray diffraction(XRD), scanning electron microscope(SEM). The results indicate that the crystallinity and morphologies of ZnO nanoparticles are significantly influenced by Sn additive. The phase formations of Zn-Sn-O including ZnO, ZnSn(OH)<inf>6</inf> were observed depending on the Sn-additive composition.