Nanotec Excellence Center on Nanoelectronic Devices

Bangkok, Thailand

Nanotec Excellence Center on Nanoelectronic Devices

Bangkok, Thailand
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Chaithanatkun N.,King Mongkut's University of Technology Thonburi | Chaithanatkun N.,Nanotec Excellence Center on Nanoelectronic Devices | Onlaor K.,King Mongkut's University of Technology Thonburi | Onlaor K.,Nanotec Excellence Center on Nanoelectronic Devices | And 2 more authors.
Key Engineering Materials | Year: 2017

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. © 2017 Trans Tech Publications.


Songkeaw P.,King Mongkut's University of Technology Thonburi | Songkeaw P.,Nanotec Excellence Center on Nanoelectronic Devices | Onlaor K.,King Mongkut's University of Technology Thonburi | Onlaor K.,Nanotec Excellence Center on Nanoelectronic Devices | And 2 more authors.
Key Engineering Materials | Year: 2017

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. © 2017 Trans Tech Publications.


Chansaengsri K.,King Mongkut's University of Technology Thonburi | Onlaor K.,King Mongkut's University of Technology Thonburi | Onlaor K.,Nanotec Excellence Center on Nanoelectronic Devices | Tunhoo B.,King Mongkut's University of Technology Thonburi | And 3 more authors.
Materials Today: Proceedings | Year: 2017

Electrospinning is the manufacturing technology for production nanoscale fibers from the polymer solution. The technique is operated in an electric field with high voltage electrical potential between two conductive electrodes. A needle is used as the anode in laboratory generally. However, the needle process is low productivity for commercialization. Free surface electrospinning is designed for solving the problem. Component use as electrodes isn't a needle. In this work represented a needle anode by a wire electrode for increasing mass production. Polymer solution droplets were entrained on a wire and control uniformity of themselves droplet. High voltage potential could be applied between wire and ground plate on the top. Polyvinylidene fluoride (PVDF) was used as a precursor to prepared nanofiber. Morphologies of nanofibers were characterized using scanning electron microscope, which informed surface description of the nanofiber. Free surface electrospinning is alternative electrostatic fiber formation technique that can produce the nanofibers thin films continuously. This process convenient for apply in roll to roll process and useful for large scale production. © 2017 Elsevier Ltd. All rights reserved.


Chaithanatkun N.,King Mongkut's University of Technology Thonburi | Chaithanatkun N.,Nanotec Excellence Center on Nanoelectronic Devices | Onlaor K.,King Mongkut's University of Technology Thonburi | Onlaor K.,Nanotec Excellence Center on Nanoelectronic Devices | And 2 more authors.
Materials Today: Proceedings | Year: 2017

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.


Keeratithiwakorn P.,King Mongkut's University of Technology Thonburi | Keeratithiwakorn P.,Nanotec Excellence Center on Nanoelectronic Devices | Songkeaw P.,King Mongkut's University of Technology Thonburi | Songkeaw P.,Nanotec Excellence Center on Nanoelectronic Devices | And 4 more authors.
Materials Today: Proceedings | Year: 2017

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. © 2017 Elsevier Ltd. All rights reserved.


Songkeaw P.,King Mongkut's University of Technology Thonburi | Songkeaw P.,Nanotec Excellence Center on Nanoelectronic Devices | Onlaor K.,King Mongkut's University of Technology Thonburi | Onlaor K.,Nanotec Excellence Center on Nanoelectronic Devices | And 2 more authors.
Materials Today: Proceedings | Year: 2017

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. © 2017 Elsevier Ltd. All rights reserved.


Onlaor K.,King Mongkut's University of Technology Thonburi | Onlaor K.,Nanotec Excellence Center on Nanoelectronic Devices | Thiwawong T.,King Mongkut's 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.


Thiwawong T.,King Mongkut's University of Technology Thonburi | Thiwawong T.,Nanotec Excellence Center on Nanoelectronic Devices | Onlaor K.,King Mongkut's 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.


Chansaengsri K.,King Mongkut's University of Technology Thonburi | Chansaengsri K.,Nanotec Excellence Center on Nanoelectronic Devices | Onlaor K.,King Mongkut's 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.


Chansaengsri K.,King Mongkut's University of Technology Thonburi | Chansaengsri K.,Nanotec Excellence Center on Nanoelectronic Devices | Onlaor K.,King Mongkut's 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. 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. © 2016 Trans Tech Publications, Switzerland.

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