Mekprasart, Wanichaya
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Mekprasart, Wanichaya
Alternative Name
MEKPRASART, Wanichaya
Mekprasart, W.
Main Affiliation
Email
wanichaya.me@kmitl.ac.th
31 results
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Item type:Publication, Quasi-solid-state dye-sensitized solar cells based on TiO 2/NiO core-shell nanocomposites(2011-07-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Comparison study of photocatalytic activity of titanium-rich materials derived from natural minerals ores using acidic leaching(2017-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Effect of Milling Speed and Time on Ultrafine ZnO Powder by High Energy Ball Milling Technique(2019-09-16); The particle size of commercial zinc oxide (ZnO) powder has been found in micron scale. For the improvement of ZnO properties, size reduction in nanoscale is required. In this work, the particle size of ultrafine ZnO powder was reduced by high energy ball milling technique. commercial grade ZnO powder with average size 0.8 μm was used as starting material. Milling speed and time of high energy milling process are considered as crucial parameters affecting size reduction of ZnO particles. Crystalline structure, surface morphological and particle size of the milled samples were investigated by X-ray diffractometer (XRD), scanning electron microscopy (SEM) and particle analyzer, respectively. The results suggested that ZnO patterns after milling process with various milling speed and time were identically in hexagonal crystalline phase affirmed by XRD result. SEM images indicate that size of ZnO products distinctly decrease according to the increase of milling time and speed. ZnO particle size after milling process was found in ultrafine power in range of 200-400 nm. These results suggest that particle size of the commercial ZnO powders can be effectively minimized to few hundred nanometer range depending on force attraction and suitable rotation during milling process with specific speed and time. Moreover, the significant milling parameters will be studied to find the optimum condition for the production of ZnO particles in nanoscale. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Photocatalytic performance of ball-milled anatase/rutile mixed phase TiO2 composite powders(2016-01-01); Mixed-phase anatase/rutile titanium dioxide (TiO<inf>2</inf>) composite powder is an important material due to the unique properties of photocatalytic activity, which the photocatalytic efficiency of mixed-phase is higher than the only single anatase or rutile phase. In this study, the anatase/rutile mixed phase TiO<inf>2</inf> composite powders were prepared by ball milling of TiO<inf>2</inf> commercial grade powders. Effect of the anatase/rutile phase ratio on photocatalytic performance was investigated. The sample phase ratio is evaluated using X-ray diffraction (XRD) meanwhile the composite morphology is characterized using field emission scanning electron microscope (FE-SEM). The overall results revealed that the mixed-phase anatase/rutile provided significant enhancement in photocatalytic performance compared with only anatase or rutile single phase. In addition, this ballmilling technique is considered an effective process, cost-effectively on energy saving, and suitable for preparing anatase/rutile TiO<inf>2</inf> mixed-phase for photocatalytic application. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Characterization of ZnO:Sn nanopowders synthesized by co-precipitation method(2014-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Structural and optical properties of F-doped ZnO nanoparticles synthesized by co-precipitation process(2016-01-01); In this work, we reported the preparation of F-doped ZnO nanoparticles by facile precipitation process using zinc nitrate and ammonium fluoride as starting precursors for Zn and F, respectively dissolved in deionized water. The precursor solution was prepared at various fluoride composition ranging from 1-5 wt%. The as-precipitated powders were calcined at different temperature from 500 °C to 700 °C for 2 h. Effect of calcination temperature and fluoride concentration on structural, morphologies, optical and electrical properties were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), UV-Vis spectroscopy, respectively. XRD results indicated the complete formation of hexagonal wurtzite structure of ZnO. SEM micrographs showed the agglomeration for each sample that noticeably influenced by fluoride content. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Synchrotron radiation x-ray photoelectron spectroscopic study of CdTe-in structures formed by laser-induced doping technique(2018-09-05); ; Nakajima, HidekiLaser-based doping technique was used in the fabrication of M-p-n structured In/CdTe/Au diodes which are sensitive to X- and γ-rays. CdTe is transparent for infrared radiation that allows irradiating the CdTe-In structures in two different ways: from metal side or through the semiconductor. The obtained In/CdTe/Au diodes were tested by electrical measurements and demonstrated low leakage current and high forward current. The distribution of In and Cd atoms with the depth in the irradiated In-CdTe structures was studied by X-ray photoelectron spectroscopy (XPS) using synchrotron radiation as the excitation light. The excitation energy was 650 eV. The In film, deposited on the CdTe crystal, was sputtered by 3 keV Ar ions during 2 hours between spectra measurements. Total time of sputtering was 10 hours. The XPS spectra for non-irradiated sample, irradiated from the In film side and through the CdTe crystal by 10 infrared laser pulses with power density of 2.5 MW/cm<sup>2</sup> were studied. Photoelectron peaks of Cd 3d and In 3d were analyzed. The evidences of laser-induced evaporation of the In film, stress-wave-induced mass transfer, freezing of non-equilibrium defects and subsequent dissolution of CdTe in the laser-molten thin layer of In film are discussed. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Influence of milling time, NH3 additive and annealing temperature on physical properties of modified commercial TiO2 powders via ball milling process(2014-01-01); N-doped TiO<inf>2</inf> were prepared via ball milling process with different operating times and annealing temperatures. Commercial TiO<inf>2</inf> anatase powders used as TiO<inf>2</inf> precursor were dispersed in ammonia solution for nitrogen source. Ball milled TiO<inf>2</inf> powders at various times were annealed in nitrogen atmosphere at different temperatures. Physical properties and surface morphologies after ball milling process were monitored by X-ray diffraction (XRD) and scanning electron microscope (SEM). The component of samples was characterized by energy-dispersive X-ray spectroscopy (EDX). The active surface area of the samples was investigated by Brunauer Emmet Teller method. SEM result indicated that large particle of TiO<inf>2</inf> precursor could be reduced via ball milling process leading to high active surface area by the increase of milling time. XRD result showed the crystalline structures of TiO<inf>2</inf> after milling process and nitrogen annealing were identical to TiO<inf>2</inf> precursor structure. Meanwhile, the appearance of impurity phase in TiO<inf>2</inf> precursor was also depreciated via ball milling process with ammonia solution and annealing under nitrogen atmosphere. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Effect of Zn:Al ratio and calcination time on structural properties of Zn-Al-O compound(2016-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Extraction and characterization of nanocellulose from sugarcane bagasse by ball-milling-assisted acid hydrolysis(2018-09-05); ;