Tunhoo, Benchapol

Preferred name

Tunhoo, Benchapol

Alternative Name

Tunhoo, B.

Main Affiliation

Integrated Innovative Technology

benchapol.tu@kmitl.ac.th

Now showing 1 - 7 of 7

Some of the metrics are blocked by your
consent settings
Influence of post-annealing temperature on the morphological, structural and optical properties of spin coated zinc oxide thin films
(2017-01-01)
Chaithanatkun, Natpasit
;
Fujihara, Takeshi
;
Kamano, Masaru
;
Konishi, Tomoya
;
Uehara, Nobutomo
In this study, zinc oxide films were fabricated on quartz glass substrate using spin coating technique with 2 molar of zinc oxide in organic solvent as starting materials. The fabricated sample was post-annealed at different temperature from 350 °C to 750 °C for 60 minutes. The energy dispersive x-ray spectroscopy (EDS) confirmed that zinc oxide coating film was fabricated on the quartz glass substrate. The crystallography of zinc oxide films were analyzed by X-ray diffraction (XRD). The crystallite size of zinc oxide nanoparticles was determined from the full-width at half maximum (FWHM) of XRD peaks using Debye-Scherrer's equation and showed that the zinc oxide films had highly crystalline quality in hexagonal wurtzite crystal structure. The morphological property of films was observed by scanning electron microscopy (SEM). Surface morphology of films shows regularly spread all of zinc oxide films. The optical property of various zinc oxide films was measured using UV-Visible spectrophotometer.
Some of the metrics are blocked by your
consent settings
Preparation of copper doped zinc oxide nanoparticles by precipitation process for humidity sensing device
(2018-09-05)
Thiwawong, Thutiyaporn
;
Onlaor, Korakot
;
Chaithanatkun, Natpasit
;
Tunhoo, Benchapol
In this work, nanoparticles of copper-doped zinc oxide were synthesized using the precipitation process at different copper doping molars. The structure of the synthesized nanoparticles was examined by X-ray diffraction and X-ray photoelectron spectroscopy. From the results, it was indicated that the nanoparticles were composed of mixed copper oxide-zinc oxide. To fabricate the humidity sensor, the nanoparticles were dispersed in ethanol and deposited on an electrode using the electrostatic spray deposition technique. The humidity sensing behavior was assessed at various humidity levels in a closed vessel of saturated salt solution. Moreover, the response times for the device were recorded. The Cole-Cole plot of the real and imaginary parts of impedance could be useful for description of the equivalent circuit that indicates the mechanism for humidity sensing behavior.
Some of the metrics are blocked by your
consent settings
Effect of ascorbic acid on structural properties of ZnO nanoparticles prepared by precipitation process
(2015-07-01)
Chaithanatkun, Natpasit
;
Chantarawong, Direklit
;
Songkeaw, Potiyan
;
Onlaor, Korakot
;
Thiwawong, Thutiyaporn
In this work, zinc oxide nanoparticles (ZnO NPs) was prepared by chemical precipitation process. To study the influence of the ascorbic acid on properties of ZnO nanoparticles, the ascorbic acid was added to precursor solution at different molar ratio of ascorbic acid (AA) and zinc during the synthesis process. The characterizations of ZnO nanoparticles were performed using X-ray diffraction (XRD), Raman spectroscope, and field emission scanning electron microscopy (FE-SEM). The effect of ascorbic acid on the structural properties of ZnO NPs was investigated.
Some of the metrics are blocked by your
consent settings
Electrical mechanisms of bi-stable memory devices based on an Al/PVK:ZnO NPs/ITO structure with different ZnO NPs annealing temperatures
(2016-10-01)
Onlaor, Korakot
;
Chaithanatkun, Natpasit
;
Tunhoo, Benchapol
We reported on the influence of the structural properties of zinc oxide nanoparticles (ZnO NPs) on electrical bi-stable device based on an aluminum/poly(9-vinylcarbazole):ZnO NPs/indium-tin oxide structure. ZnO NPs were synthesized by simple precipitation method with different annealing temperatures. When annealing temperature was increased, the ZnO NPs crystallite increased and the ZnO NPs gradually changed shape from nanostar-like to nanospherical. The structural parameters, such as the crystallite size of ZnO NPs and dislocation density, can be calculated from the XRD spectra. The effect of ZnO NPs annealing temperature on memory properties can be measured by current-voltage characteristics and retention time measurements. The maximum ON/OFF current ratio for the memory devices was about 10<sup>3</sup> and the devices exhibited the Write-Once, Read-Many (WORM) memory type. The operating mechanisms of the memory device were analyzed using theoretical models, in which electrons trapping in the ZnO NPs and electrons tunneling among a PVK matrix by direct tunneling process were discussed.
Some of the metrics are blocked by your
consent settings
Comparative study of post-sintering temperature on properties of copper doped zinc oxide nanoparticles prepared by co-precipitation process
(2017-01-01)
Chaithanatkun, Natpasit
;
Onlaor, Korakot
;
Tunhoo, Benchapol
Copper doped zinc oxide nanoparticles (Cu doped ZnO NPs) has been prepared by co-precipitation process using zinc nitrate, copper nitrate and potassium hydroxide as zinc, copper and hydroxide precursor, respectively. All of prepared conditions were fixed as the concentration of copper in zinc oxide about atomic percentage at 2%. The prepared powders of Cu doped ZnO NPs were studied with various post-sintering temperature at 500, 600 and 700 °C. All of samples were characterized using X-ray Diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX) and Fourier transform infrared spectroscopy (FT-IR). The EDX spectra showed the qualitative and quantitative elemental composition of prepared material, meanwhile, XRD peaks represented Cu doped ZnO NPs in hexagonal wurtzite structure. The improvement in crystallinity of Cu doped ZnO NPs could be performed by sintering process. Moreover, the SEM and TEM images showed that the Cu doped ZnO NPs were condensed to the larger particles size by the increase of sintering temperature. Finally, the FT-IR spectra showed a broad absorption band for all of samples.
Some of the metrics are blocked by your
consent settings
The influence of annealing temperature on structural properties of zinc oxide nanoparticles synthesized by precipitation method
(2017-01-01)
Chaithanatkun, Natpasit
;
Onlaor, Korakot
;
Tunhoo, Benchapol
In the present work, the precipitation method was used to prepare zinc oxide nanoparticles in the presence of zinc nitrate and potassium hydroxide as zinc precursor and hydroxide precursor, respectively. The influence of annealing temperature on the structural, morphological, and vibrational properties of zinc oxide nanoparticles was studied by X-ray diffraction (XRD), Field emission scanning electron microscopy (FE-SEM), Fourier transform Raman spectroscopy (FT-Raman), and Fourier transform infrared spectroscopy (FT-IR) techniques. The effects of annealing temperature on the crystallite size of zinc oxide nanoparticles were investigated. The XRD results represented that the zinc oxide nanoparticles exhibited high crystallinity of hexagonal wurtzite crystal structure. The average crystallite size of nanoparticles increased from 25 nm to 31 nm with an increase in annealing temperature from 600°C to 800°C. The SEM images showed that the prepared zinc oxide nanoparticles in this present work were spherical in shape and had the larger size with increasing annealing temperature. FT-Raman and FT-IR spectra confirmed that the quality of Zn-O vibrational mode was stronger at higher annealing temperature.
Some of the metrics are blocked by your
consent settings
Electrical bistable properties of ZnO nanoparticles thin film prepared by electrostatic spray deposition technique
(2015-07-01)
Chaithanatkun, Natpasit
;
Chantarawong, Direklit
;
Songkeaw, Potiyan
;
Onlaor, Korakot
;
Thiwawong, Thutiyaporn
Thin films of zinc oxide nanoparticles (ZnO NPs) for bistable device was prepared by electrostatic spray deposition technique based on an indium-tin oxide/ZnO NPs/aluminum (ITO/ZnO NPs /Al) structure. The characterizations of ZnO NPs films were performed using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM). The influence of the deposition time on properties of films was also investigated. Moreover, the effect of deposition time on the bistable properties can be performed by current-voltage (I-V) measurements. The conduction mechanism of the bistable device was analyzed by theoretical model.

Tunhoo, Benchapol

Filters

Settings

Sort By

Results per page