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Onlaor K.,King Mongkuts University of Technology Thonburi | Onlaor K.,Nanotec Excellence Center on Nanoelectronic Devices | Thiwawong T.,King Mongkuts University of Technology Thonburi | Thiwawong T.,Nanotec Excellence Center on Nanoelectronic Devices | And 2 more authors.
Organic Electronics: physics, materials, applications | Year: 2016

This research reported the transparent non-volatile write-once-read-many-times (WORM) memory behaviors of memory devices based on zinc oxide nanoparticles (ZnO NPs) embedded in an insulating poly(ethylene-co-vinyl acetate) (EVA), sandwiched between two ITO-coated flexible polyethylene naphthalate (PEN) substrates. The memory devices were fabricated employing a thermal roll lamination technique with the laminated-structure of PEN/ITO/EVA:ZnO NPs/ITO/PEN. The average transmittance of the laminated memory device was over 70% for an optical visible range of 400-800 nm. The maximum ON/OFF current ratio for the memory device was about 103. In addition, a reliability study for continuous read operations in a long time memory device is presented. The conductance switching mechanisms of the laminated memory device were analyzed using theoretical models on the basis of the experimental data. © 2016 Elsevier B.V. All rights reserved. Source


Thiwawong T.,King Mongkuts University of Technology Thonburi | Thiwawong T.,Nanotec Excellence Center on Nanoelectronic Devices | Onlaor K.,King Mongkuts University of Technology Thonburi | Onlaor K.,Nanotec Excellence Center on Nanoelectronic Devices | And 2 more authors.
Advances in Materials Science and Engineering | Year: 2013

In this work, thin film of silver nanoparticles for humidity sensor application was deposited by electrostatic spray deposition technique. The influence of the deposition times on properties of films was studied. The crystal structures of sample films, their surface morphology, and optical properties have been investigated by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and UV-VIS spectrophotometer, respectively. The crystalline structure of silver nanoparticles thin film was found in the orientation of (100) and (200) planes of cubic structure at diffraction angles 2θ = 38.2° and 44.3°, respectively. Moreover, the silver nanoparticles thin films humidity sensor was fabricated onto the interdigitated electrodes. The sensor exhibited the humidity adsorption and desorption properties. The sensing mechanisms of the device were also elucidated by complex impedance analysis. © 2013 Thutiyaporn Thiwawong et al. Source


Keeratithiwakorn P.,King Mongkuts University of Technology Thonburi | Keeratithiwakorn P.,Nanotec Excellence Center on Nanoelectronic Devices | Onlaor K.,King Mongkuts University of Technology Thonburi | Onlaor K.,Nanotec Excellence Center on Nanoelectronic Devices | And 4 more authors.
Advanced Materials Research | Year: 2013

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:Alq3/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. Source


Chaithanatkun N.,King Mongkuts University of Technology Thonburi | Chaithanatkun N.,Nanotec Excellence Center on Nanoelectronic Devices | Onlaor K.,King Mongkuts University of Technology Thonburi | Onlaor K.,Nanotec Excellence Center on Nanoelectronic Devices | And 4 more authors.
Key Engineering Materials | Year: 2016

In this work, zinc oxide (ZnO) nanoparticles were synthesized by simple chemical precipitation method in the present of zinc nitrate as zinc precursor and sodium hydroxide as hydroxide precursor. The vitamin C was used as modifier media to modify the structural properties of ZnO nanoparticles. The microstructures of ZnO nanoparticles were characterized by field emission scanning electron microscope (FE-SEM) and transmission electron microscope (TEM). Selected area electron diffraction (SAED) patterns showed that polycrystalline hexagonal phase of ZnO. The defects and impurity contents in nanoparticles were investigated by Fourier transform infrared (FT-IR) spectroscopy. The results show few carboxylate and hydroxyl impurities for larger particles when addition modifier increases. Surface areas of nanoparticles were measured by Brunauer Emmett Teller (BET) method. In addition, the results exhibited the dramatically change in structural properties of ZnO nanoparticles due to the effect of vitamin C. © 2016 Trans Tech Publications, Switzerland. Source


Chansaengsri K.,King Mongkuts University of Technology Thonburi | Chansaengsri K.,Nanotec Excellence Center on Nanoelectronic Devices | Onlaor K.,King Mongkuts University of Technology Thonburi | Onlaor K.,Nanotec Excellence Center on Nanoelectronic Devices | And 4 more authors.
Key Engineering Materials | Year: 2016

In this work, cobalt oxide thin films were prepared by electrostatic spray deposition (ESD) technique on glass substrate. The influence of the annealing temperature on properties of cobalt oxide film was investigated. The structural, optical and morphology of cobalt oxide thin films were characterized by X-ray diffraction (XRD), Raman spectroscopy, UV-Visible spectrophotometer, scanning electron microscope, respectively. The crystalline parameters such as crystalline size of films can be obtained from XRD spectra. Phase transformation due to the different annealing temperature in cobalt oxide film has been observed. Moreover, at the higher annealing temperature, the optical band gap in cobalt oxide films were shifted to lower value due to the change in crystalline size and the defect sites in films. © 2016 Trans Tech Publications, Switzerland. Source

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