Onlaor, Korakot

Preferred name

Onlaor, Korakot

Alternative Name

Onlaor, K.

Main Affiliation

Integrated Innovative Technology

korakot.on@kmitl.ac.th

Now showing 1 - 10 of 20

Some of the metrics are blocked by your
consent settings
Supercapacitive properties of cobalt oxide thin films prepared by electrostatic spray deposition technique at different substrate temperature
(2016-01-01)
Chansaengsri, Kasidid
;
Onlaor, Korakot
;
Thiwawong, Thutiyaporn
;
Tunhoo, Benchapol
In this work, cobalt oxide thin films were prepared by electrostatic spray deposition (ESD) technique. The influence of the substrate temperatures on properties of film was investigated. Phase transformation of cobalt oxide thin films due to the effect of different substrate temperature was also observed. Cyclic voltammetry was used to measure the performance of cobalt oxide supercapacitor. At higher substrate temperature, the cobalt oxide thin films exhibit the high specific capacitance due to the effect of phase transformation in cobalt oxide films.
Some of the metrics are blocked by your
consent settings
A humidity sensor based on iron oxide films prepared by spin coating process
(2017-01-01)
Songkeaw, Potiyan
;
Onlaor, Korakot
;
Tunhoo, Benchapol
In present work, iron oxide films were prepared by spin coating technique. The effect of annealing temperature on the properties of films was investigated. The structural and surface morphology properties of films have been performed by X-ray diffraction, Fourier transform infrared spectroscopy, and field-emission scanning electron microscope. To fabricate the humidity sensor device, the iron oxide film was spun on indium tin oxide transparent electrode. The sensor exhibited the humidity response in the range of 23-93% RH. The mechanisms and equivalent circuit models of sensor can be explained by complex impedance measurement.
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 Annealing Temperature on Properties of Tin Oxide Films Prepared by Electrostatic Deposition Technique
(2018-01-01)
Onlaor, Korakot
;
Tunhoo, Benchapol
;
Thiwawong, Thutiyaporn
In this work, tin oxide films were prepared by electrostatic spray deposition technique. The effect of post annealing temperature on properties of prepare film was performed. The structural, surface morphology and optical properties of tin oxide films were characterized by X-ray diffraction, field-emission scanning electron microscope, and UV-Visible spectrophotometer. The crystalline size is found to increase with increase the annealing temperature. Moreover, the effect of annealing temperature on physical properties of tin oxide films has been performed.
Some of the metrics are blocked by your
consent settings
Effect of anodizing voltage on anodic titanium dioxide (ATO) growth based on an ethylene glycol solution containing NH4F
(2016-01-01)
Mangkornkarn, Chayangkoon
;
Samransuksamer, Benjarong
;
Horprathum, Mati
;
Eiamchai, Pitak
;
Eiad-Ua, Apiluck
We reported on the influence of applied voltage on the surface morphology of anodic titanium dioxide (ATO) thin films. At first, titanium (Ti) thin films were prepared by DC-magnetron sputtering for use as a base material in the anodization process. The titanium dioxide (TiO<inf>2</inf>) nanoporous ATO was fabricated by the anodization process from the Ti thin film, with different applied voltages from 20 V to 60 V in an electrolyte based on an ethylene glycol containing NH<inf>4</inf>F. Pore size distribution of ATO thin films can be varied from 20-50 nm by increasing the applied voltage, while the thickness of the film also increases. In addition, to observe the effect of time, the optimal condition of anodizing voltage was studied by increasing the anodizing time. The results clearly showed the nanoporous ATO over the films and the thickness of the nanoporous ATO is approximately 260 nm.
Some of the metrics are blocked by your
consent settings
Humidity sensor based on graphene oxide film prepared by simple drop-casting process
(2017-01-01)
Songkeaw, Potiyan
;
Onlaor, Korakot
;
Tunhoo, Benchapol
In this work, the film of graphene oxide was deposited by drop-casting process for humidity sensor device. The structural property of graphene oxide film was performed by Raman spectroscopy. The humidity device was fabricated onto the indium tin oxide, as the transparent electrode. The device exhibited the adsorption and desorption behaviors of humidity in a range of 23-93 %RH. The complex impedance measurement was used to explain the mechanisms of the humidity device. The equivalent circuit model of the device was demonstrated.
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
Charge transfer mechanism in organic memory device
(2010-02-05)
Onlaor, K.
;
Khantham, S.
;
Tunhoo, B.
;
Thiwawong, T.
;
Nukeaw, J.
In this paper, the conduction mechanism in organic bistable memory device was investigated by both experimental and theoretical method. The current voltage (J-V) characteristics showed the electrical bistable properties between an initial low-conductivity state and a highconductivity state upon application of an external electric field at room temperature. The current transition exhibited a very narrow voltage range that causes an abrupt increase of current. The onstate and the off-state were proposed by space-charge-limited current and thermionic emission model, respectively. That supported by the experimental data to explained the charge transfer mechanism in organic memory device. © (2010) Trans Tech Publications.
Some of the metrics are blocked by your
consent settings
Preparation of iron oxide (Fe2O3) nanoparticles thin film for humidity sensing device
(2021-09-15)
Onlaor, Korakot
;
Boontanom, Ukit
;
Thiwawong, Thutiyaporn
;
Songkeaw, Potiyan
;
Tunhoo, Benchapol
In this work, the iron oxide (Fe2O3) nanoparticles thin films were applied to prepare humidity device. Fe2O3 nanoparticles were prepared by precipitation process following with post sintering process at various temperatures. The properties of Fe2O3 nanoparticles were characterized by X-ray diffraction, Raman spectroscopy, and Fourier transform infrared spectroscopy, respectively. The effect of sintering temperatures on properties of synthesized particles was investigated. To fabricate the humidity device, the suspension of Fe2O3 nanoparticles in ethanol solvent was dropped on gold interdigited electrodes. The device impedance demonstrated the response of humidity level at various values. The humidity sensing characteristics such as sensitivity, response times, and hysteresis, respectively, were performed. It was observed that the humidity response depended on the post sintering temperatures of Fe2O3 nanoparticles.

Onlaor, Korakot

Filters

Settings

Sort By

Results per page