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Electrical Properties of Eggshell-Derived CaO Composited with Polyvinylpyrrolidone for Bistable Device
(2022-01-01)
Tunhoo, Benchapol
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Onlaor, Korakot
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Songkeaw, Potiyan
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Sriyapan, Jaturon
;
Thiwawong, Thutiyaporn
In this work, bistable devices were fabricated from eggshell-derived calcium oxide (CaO). CaO powders can be obtained from the calcination of chicken eggshells at temperatures from 700-1000 °C. The properties of derived CaO were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and field-emission scanning electron microscopy. CaO was composited with polyvinylpyrrolidone (PVP) polymer to fabricate a bistable device with the device structure of ITO/PVP:CaO/Al. The maximum ON/OFF current ratio for the device was approximately 104. In addition, the retention time operations reached higher than 104 s, which revealed the stability of the bistable device. The theoretical model and conduction mechanisms were presented to explain the behavior of the bistable device.
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Preparation of iron oxide (Fe2O3) nanoparticles thin film for humidity sensing device
(2021-09-15)
Onlaor, Korakot
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Boontanom, Ukit
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Thiwawong, Thutiyaporn
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Songkeaw, Potiyan
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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.
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Electrical properties of bistable device based on graphene oxide composited with polyvinylpyrrolidone thin films
(2021-01-01)
Thiwawong, Thutiyaporn
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Songkeaw, Potiyan
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Onlaor, Korakot
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Tunhoo, Benchapol
This research studied the bistable properties of synthesized graphene oxide (GO) composited with polyvinylpyrrolidone (PVP). The devices were fabricated using a spin coating process on indium tin oxide (ITO)/glass substrate, and the top electrodes were prepared by thermal evaporation with the device structure of ITO/PVP:GO/Al. The PVP:GO films were characterized by Raman spectroscopy, Fourier-transform infrared spectroscopy, X-ray photoemission spectroscopy, and scanning electron microscopy. The current-voltage (I-V) characteristics of the fabricated device exhibited a maximum ON/OFF current ratio in the order of about 104 at a GO concentration of 4 wt%. The mechanism was explained by fitting with the results of the I-V measurement. Moreover, the retention test of the device was more than 2×104 s. The device showed the important characteristics of memory to be a candidate for data storage.
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Reduced graphene oxide thin film prepared by electrostatic spray deposition technique
(2019-03-15)
Songkeaw, Potiyan
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Onlaor, Korakot
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Thiwawong, Thutiyaporn
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Tunhoo, Benchapol
Reduced graphene oxide (rGO) thin films were prepared by one-step electrostatic spray deposition (ESD) technique with a precursor solution of graphene oxide in mixed alcohol solvent. The deposited rGO films showed decreasing thicknesses ranging from approximately 340 nm–120 nm as substrate temperature increased from 150 °C to 275 °C. Raman spectroscopy indicated lowest intensity ratio of D to G band (I <inf>D</inf> /I <inf>G</inf> ) of the rGO films at substrate temperature of 275 °C. Highest carbon per oxygen (C/O) ratio was also obtained at substrate temperature of 275 °C. The ESD technique was used for film deposition on an area of 5 × 5 cm 2 , while an acetone gas sensor based on single layer rGO film was fabricated by one-step ESD technique. Results indicated the possibility of controlling thickness components in the rGO film, and the capability of large-area production by this scalable ESD method.
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Properties of manganese oxide films prepared by electrostatic deposition technique
(2018-01-01)
Songkeaw, Potiyan
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Onlaor, Korakot
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Thiwawong, Thutiyaporn
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Tunhoo, Benchapol
In this work, the electrostatic spray deposition technique was applied to prepare manganese oxide tin films. The effects of post annealing at various temperatures on the properties of manganese oxide film were studied. The properties of the films were assessed by X-ray photoelectron spectroscopy and field-emission scanning electron microscope. In addition, the electrochemical properties of the manganese oxide films were investigated. It was found that the prepared films could be used for supercapacitive, energy storage devices.
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Humidity sensor based on graphene oxide film prepared by simple drop-casting process
(2017-01-01)
Songkeaw, Potiyan
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Onlaor, Korakot
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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.
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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.
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Structural properties of copper phthalocyanine films grown by electrophoretic deposition process
(2017-01-01)
Keeratithiwakorn, Punnapa
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Songkeaw, Potiyan
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Onlaor, Korakot
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Tunhoo, Benchapol
In this work, organic film of copper phthalocyanine (CuPc) was prepared by electrophoretic deposition process. The structural, morphological and optical properties of CuPc films were characterized by X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (FESEM), and UV-VIS spectroscopy. The effect of annealing temperature on properties of CuPc films has been studied. When the annealing temperature is increased, the phase transformation of CuPc gradually changes from α-phase to β-phase. The optical absorption spectra of films at the different annealing temperature demonstrated the characteristics of B-band and Q-band of CuPc films. Moreover, the morphology of films exhibited the rod-like structure, while at higher annealing temperature the morphology of CuPc films change to sheet-like structure.
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Effect of ascorbic acid on structural properties of ZnO nanoparticles prepared by precipitation process
(2015-07-01)
Chaithanatkun, Natpasit
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Chantarawong, Direklit
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Songkeaw, Potiyan
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Onlaor, Korakot
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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.
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Electrical bistable properties of ZnO nanoparticles thin film prepared by electrostatic spray deposition technique
(2015-07-01)
Chaithanatkun, Natpasit
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Chantarawong, Direklit
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Songkeaw, Potiyan
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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.

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