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Author: search.filters.author.Pecharapa, W.Subject: search.filters.subject.Nanoparticles

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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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    Synthesis and Characterization of Zn-Doped TiO2 Nanoparticles via Sonochemical Method
    (2015-09-02)
    Wattanawikkam, C.
    ;
    Pecharapa, W.
    Zn-doped TiO<inf>2</inf> nanoparticles were successfully fabricated using sonochemical method accompanying post calcination process. Titanium isopropoxide (Ti[OC3H7]4) and Zinc chloride (ZnCl2) were used as starting precursors for Ti and Zn sources, respectively. The homogeneous mixing solution of different Zn (0-1 mol%) and Ti ratio were irradiated in high intensity ultrasound sonometer (750 W 20 kHz) for 30 min at room temperature to obtain as-synthesized Zn-doped TiO<inf>2</inf> nanoparticles followed by calcination at 400-700°C. To evaluate the structure and phase identification of prepared powders, the X-ray diffraction (XRD) and Raman spectroscopy were employed. The results reveal that the as-synthesized Zn-doped TiO<inf>2</inf> nanoparticles are in anatase phase and their crystallinity increases with increasing calcined temperature. The morphology of as-synthesized powders was investigated by transmission electron microscope (TEM). The effect of Zn content and calcinations temperature on TiO<inf>2</inf> properties was also discussed. © 2015
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    Al-doped ZnO nanoparticles synthesized by sonochemical-assisted method
    (2013-10-08)
    Chongsri, K.
    ;
    Wongpisutpaisan, N.
    ;
    Sungthong, A.
    ;
    Vittayakorn, N.
    ;
    Pecharapa, W.
    Al-doped ZnO nanoparticles were synthesized by sonochemical method from zinc acetate dehydrate and aluminum acetate as starting precursors. The deionized (DI) water was selected as the solvent. Sonication of the precursor was performed by a Sonics Model VCX 750 for 30 minutes until precipitated product was finally obtained. The as-precipitated powders were calcined at different temperature range of 550-1100 °C for 2 hr. For all samples, their crystal structures were investigated by X-ray diffraction (XRD) and surface morphologies were observed by scanning electron microscope (SEM). The XRD results revealed that, the purity of as-synthesized powders increases when the calcination temperature increases. Moreover, it is noticed that the AlZnO partial peaks will appear when the as-synthesized powders were calcined at 800 - 1000 °C. In addition, SEM micrographs show the increase of agglomeration and the particles when the calcination temperature increases. © (2013) Trans Tech Publications, Switzerland.