Tunhoo, Benchapol
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Tunhoo, Benchapol
Alternative Name
Tunhoo, B.
Main Affiliation
Email
benchapol.tu@kmitl.ac.th
60 results
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Item type:Publication, Preparation of pH Sensor Based on Extended-Gate Field-Effect Transistor with Spinel ZnCo2O4 Thin Films by Electrostatic Spray Deposition(2023-12-01); ; Electrostatic spray deposition was applied to prepare pH sensing with spinel ZnCO<inf>2</inf>O<inf>4</inf> thin films based on the measurement of extended-gate field-effect transistors (EGFET). The influence of annealing temperatures on the characteristics of the prepared films was analyzed. The structural and morphological properties of the annealed ZnCo<inf>2</inf>O<inf>4</inf> films were assessed by x-ray diffraction, x-ray photoelectron spectroscopy, Raman spectroscopy, scanning electron microscopy, and contact angle measurement. The effect of the ZnCo<inf>2</inf>O<inf>4</inf> annealing temperature on the characteristics of pH sensing for the prepared ZnCo<inf>2</inf>O<inf>4</inf> films in EGFET measurement were examined with pH buffer solutions in a pH range of 2–12 at room temperature. The sensing films annealed at 550°C demonstrated a high voltage and current sensitivity at 67.6 mV/pH and 1.033 (µA)<sup>½</sup>/pH, with linearity values of 0.9968 and 0.9991, respectively. Moreover, the annealed 550°C ZnCo<inf>2</inf>O<inf>4</inf> film exhibited low hysteresis at 4.99 mV and high retention stability. The results revealed that the pH sensing of the ZnCo<inf>2</inf>O<inf>4</inf> EGFET device showed a super-Nernstian sensitivity, which indicated the influence of the surface properties of the annealed film. Therefore, the ZnCo<inf>2</inf>O<inf>4</inf> film should be considered a potential option for the pH sensing layer in EGFET applications. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Humidity sensor based on graphene oxide film prepared by simple drop-casting process(2017-01-01); 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 yourconsent settings
Item type:Publication, Electrical Bistable Properties of P-25 TiO2 Nanoparticles Composited with PVP for Memory Devices(2019-10-01); In this work, P-25 titanium dioxide nanoparticles (TiO<inf>2</inf> NPs) were composited with poly-vinylpyrrolidone (PVP) at various concentrations of TiO<inf>2</inf> NPs. The bistable memory devices were fabricated by spin coating from a prepared PVP:TiO<inf>2</inf> NPs solution on indium tin oxide (ITO) electrodes with the device structure of ITO/PVP:TiO<inf>2</inf> NPs/Al. The maximum ON/OFF current ratio of the bistable memory devices was approximately 10<sup>5</sup> at a reading voltage of +1 V. The mechanism of the memory device can be expressed by theoretical fitting between the experimental results and conduction models. Moreover, a retention time test for continuous read operations of the device is presented. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Characterization of copper phthalocyanine thin film photovoltaic on PET substrate prepared by electron-beam evaporation technique(2010-05-05); Organic thin film photovoltaics on polyethylene tereohthalate (PET) plastic substrate have been fabricated from copper-phthalocyanine (CuPc) prepared by electron beam evaporation technique. The orientation of CuPc crystal exhibited (200) plane with alpha-phase monoclinic structure. The optical absorption spectra of CuPc layer, is nearly complementary the main maxim of CuPc layer is centered at 615 and 690 nm, the CuPc layers contribute to the photogeneration of carriers in the device. ©2010 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Study of PDMS compounds using the adhesion force determined by AFM force distance curve measurements(2010-02-05); The atomic force microscope(AFM) was used to perform surface force measurements in contact mode to investigate surface properties of model systems at the nanoscale. Three different Polydimethylsiloxane (PDMS) compounds were observed. The first consisted of pure PDMS, the second of PDMS blend with the nanoparticles Zinc Oxide(PDMS/ZnO) and the third of PDMS blend with the nanoparticles Zinc Oxide and toluene solvent(PDMS/ZnO/toluene), respectively. Surface morphology and the adhesion force were investigated by using atomic force microscopy. Force - distance curve measurement was performed in a contact mode, which used tip as silicon nitride. Moreover, we found a significantly different of the adhesion force when modified by nanoparticles ZnO and toluene solvent. © (2010) Trans Tech Publications. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Electrical bistability of tris-(8-hydroxyquinoline) aluminum (Alq 3)/ZnSe organic-inorganic bistable device(2012-01-01); ; ; We present that the electrical bistability in organic-inorganic bistable devices based on tris-(8-hydroxyquinoline) aluminum (Alq<inf>3</inf>) and zinc selenide (ZnSe) with the tri-layer structure of Alq<inf>3</inf>/aluminum (Al)/ZnSe. The current-voltage characteristics of the bistable device exhibit two electrical states as low (OFF state) and high (ON state) conductivity with ON/OFF ratio about four orders of magnitude. The conduction mechanisms in both ON and OFF states were analyzed by theoretical model. In the OFF state, the conduction mechanisms can be explained by thermionic emission model, which the ON state can be described by ohmic conduction model. The retention times of both states are more than 8000 s, and the device can reproduce continuous write-read-erase-read switching cycles. Moreover, for the organic-inorganic bistable device was kept at one year in ambient condition without encapsulation. The device still exhibited the electrical bistable behavior. Consequently, the ZnSe layer may be led to improve the lifetime property of the bistable device which acted as a self-encapsulating layer. © 2011 Elsevier B.V. All rights reserved. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Effect of ascorbic acid on structural properties of ZnO nanoparticles prepared by precipitation process(2015-07-01); 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 yourconsent settings
Item type:Publication, Preparation of iron oxide (Fe2O3) nanoparticles thin film for humidity sensing device(2021-09-15); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Impedance spectroscopy studies of DCM doped Alq3 organic material(2013-10-29); ; In this work, we report on the frequency-impedance characteristics of dye-doped organic material. The device structure is glass substrate/indium tin oxide/DCM:Alq<inf>3</inf>/Aluminum 100 nm. The influence of doping concentraion has been investigated by impedance spectroscopy. The impedance characteristics of the dye-doped organic material can be modelled by simply adopting the conventional equivalent circuit with the simple combination of resistors and capacitor network. The variation of bulk resistance with applied bias voltage as a result of the Space Charge Limited Conduction (SCLC) mechanism for charge conduction. © (2013) Trans Tech Publications, Switzerland. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Preparation of Nanofibers of Poly (methyl methacrylate) Composited with Few-Layer-Graphene for Anticorrosion Layer(2022-12-01); ; An anticorrosion layer is a significant component that prevents the corrosion process in materials. In this work, a nanofiber of poly (methyl methacrylate) composited with few-layer-graphene was prepared as an anticorrosion layer. An electrospinning process was applied to prepare composite nanofiber on a metal substrate at various concentrations of few-layer graphene. The physical properties of the composite nanofiber were investigated with field-emission scanning electron microscope, Raman spectroscopy, and contact angle measurement. The corrosion behavior was tested in an aqueous solution of 3.5% by weight of sodium chloride. It was found that a few-layer graphene concentration of 2 wt% in polymethacrylate showed the optimum anticorrosion on aluminum sheet, as observed on a Tafel graph. Compared with the uncoated metal, the coated aluminum sheet was protected against corrosion with a protection efficiency of 99.33%. The prepared materials prevented the infiltration of water and solution ions into the metal plate.