Kitiwan, Mettaya
Loading...
Preferred name
Kitiwan, Mettaya
Alternative Name
Kitiwan, M.
Main Affiliation
Email
mettaya.ki@kmitl.ac.th
21 results
Now showing 1 - 10 of 21
- Some of the metrics are blocked by yourconsent settings
Item type:Publication, Optical Properties of CuCdS Thin Film Prepared by Vacuum Thermal Evaporation Technique(2023-01-01); This study reports on the synthesis and characterizations of copper cadmium sulfide (CuCdS) thin films prepared using the vacuum thermal evaporation technique with copper sulfide and CdS as precursors in a 1:1 molar ratio. The structural properties of the thin films were analyzed using X-ray diffraction (XRD) which revealed that the main composition of the thin film was CdS with the preferred orientation of the (101) plane. The optical properties were examined using UV–Vis spectrophotometry. The photosensitivity of the films was determined using I–V measurements performed with a two-probe technique. The prepared CuCdS thin films have high optical transmittance of 92%. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Effect of AlN addition on the reaction sintering of Al2TiO5 composites fabricated by spark plasma sintering(2023-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Fabrication and characterization of lightweight aggregates with expanded perlite and NPK nutrient incorporation(2025-06-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Dry film Holographic grating based on computer-generated mask Lithography(2022-01-01); ; This paper presented an alternative technique for fabricating the dry film holographic grating based on a mask generated by computer simulation and experimental results. The mask was generated by a fringe pattern which is created by the mathematical model of two beams interference with various angles. Computer simulation of the fringe pattern was printed on film, i.e., the holographic grating mask. The mask was attached on dry film and then illuminated by UV light, where the lithography technique was applied. According to the lithography technique, the computer-generated holographic grating mask was transferred to dry film. After fabrication, fringe patterns obtained from the grating were observed. Then, the grating period was analyzed and confirmed by Scanning Electron Microscope (SEM). Experimental results show that the method could apply to fabricate the dry film holographic grating. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Modification of Al2O3-Based Membranes with Carbon Black for Enhanced Hydrogen Permeation(2025-11-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Microwave-activated reduced graphene oxide composite with hydrothermally treated corn husk activated carbon as an active electrode for high electrochemical performance in symmetrical carbon-based supercapacitor devices(2026-07-01); This work applies microwaves for synthesizing reduced graphene oxide (rGO) and waste material corn husk activated carbon composites as active electrode materials for symmetric supercapacitors. The rGO is activated by microwave treatment and corn husk carbon by KOH in processed hydrothermal activation, followed by compositing at various weight ratios. Among all compositions, rGO:H_Corn_C (90:10) is reported with the best properties, with a specific surface area of 314.2 m2/g and a high specific capacitance of 1152 F/g at 0.1 A/g. The optimized composite also delivered increasing energy and power densities of up to 160 Wh/kg and 9.68 × 102 W/kg, respectively, within a 1 V operating window. In an experiment by assembling a symmetric coil cell supercapacitor, the device showed a specific capacitance of 142.23 F/g at 0.1 A/g, cycling stability with 98.8% capacitance retention after 1000 cycles of charge-discharge, and peak energy and power densities of 40.68 Wh/kg and 5.74 × 102 W/kg. Overall, the composite material with a high content of rGO and corn husk-derived activated carbon prepared by the hydrothermal method exhibits high-performance for the material in supercapacitor applications. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Reversible thermally stimulated phase transition in amorphous–nanocrystalline β-V2O5 thin films for temperature-sensitive electronics(2026-01-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Effects of substrate rotational speed and phase transition on β-V2O5 for temperature-sensitive thin films(2025-12-01); The phase stability and reversibility of V<inf>2</inf>O<inf>5</inf> are crucial for smart, contactless optical thermal sensors. Controlling phase characteristics optimizes device performance, particularly by achieving lower phase-transition temperatures with reversible properties. This study examines the effects of substrate rotational speed on the phase content and homogeneity of V<inf>2</inf>O<inf>5</inf> thin films deposited via radiofrequency magnetron sputtering using an inclined magnetron head and an O<inf>2</inf>-reactive process. Characterized using X-ray diffraction, electron microscopy, Hall effect measurements, and ultraviolet–visible spectroscopy, the films exhibited a mixture of β-monoclinic and β-tetragonal phases. Increasing the substrate rotational speed from 0 to 40 rpm increased the film thickness from 125 to 220 nm but reduced the crystallite size from 16.8 to 7.9 nm for the β-monoclinic phase. The direct bandgap energy decreased from 3.582 to 2.56 eV, and the electron density decreased from 2.92 × 10<sup>18</sup> to 5.2 × 10<sup>17</sup> cm<sup>−3</sup>, suggesting suppressed depletion of vanadyl oxygen in the film structure. Optical analysis revealed that the dispersive energy for the β-monoclinic phase increased from 24.7 to 30.3 eV as the rotational speed increased—attributed to stronger polarization due to lattice vibrations. The responses of the annealed and as-deposited films to thermally induced stimuli were investigated. During cooling to 100 °C, the β-tetragonal phase content continued to increase, whereas the β-monoclinic phase content decreased and appeared to revert to levels observed before heating. This result revealed a reversible β-monoclinic phase transformation during cooling, indicating the potential of amorphous β-monoclinic V<inf>2</inf>O<inf>5</inf> films for chromic and temperature-sensitive sensors with repeatable performance. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Utilization coal-bottom ash and sludge from wastewater for fabricating porous ceramic PM filter: properties and filtering performance(2025-12-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A STUDY ON SiC SUSCEPTOR CONFIGURATION FOR MICROWAVE HYBRID HEATING(2023-01-01);