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Chachoengsao, Thailand

Saensak R.,Khon Kaen University | Faibut N.,Khon Kaen University | Porntheeraphat S.,Thai Microelectronic Center | Paosawatyanyong B.,Chulalongkorn University | And 2 more authors.
Procedia Engineering | Year: 2012

This work reports the fabrication and electrochemical characterization of the polydimethylsiloxane (PDMS) microfluidic three-electrode cell chip utilizing diamond-like carbon (DLC) films as a working electrode for amperometric biosensing applications. The DLC films are prepared by a radio-frequency plasma enhanced chemical vapor deposition (RF-PECVD) technique with CH4 as a carbon precursor gas. Raman spectroscopy is employed to characterize the film structures. Cyclic voltammetry is used to investigate the responses of a standard redox species (K3Fe(CN)6 in KNO3) at the three-electrode system. Immobilization of glucose oxidase at the DLC surfaces is attempt through a covalent linkage. Preliminary results indicate that a mediator-free amperometric detection of glucose can be achieved with this device. © 2012 The Authors. Published by Elsevier Ltd.

Khiannok V.,Ubon Ratchathani Rajabhat University | Mekla V.,Ubon Ratchathani Rajabhat University | Porntheerapat S.,Thai Microelectronic Center
Advanced Materials Research | Year: 2013

Anatase and rutile TiO2 nanostructure have been successfully synthesized via CD reactive magnetron sputtering and hydrothermal synthesis followed by post-treatment from titanium powder. The morphology and crystalline structure of the nanostructure are characterized in detail with X-ray diffraction (XRD), Field Emissiom Scanning Electron Microscope (FE-SEM), Scanning Electron Microscope (SEM), energy dispersive X- ray and energy dispersive x-ray analyzer (EDX). The pattern showed anatase and rutile phase crystalline structure. The thin films showed the surface as viewed uniform tiny spots distribution. TiO2 nanostructures were successfully synthesized using a simple hydrothermal synthesis method from TiO2 nanoparticles. The samples were synthesized by means of the hydrothermal reaction of TiO2 nanoparticle of anatase and rutile phase. In a typical procedure, The time were varied, and cooled to room temperature, naturally. The samples showed structures of crystalline, anatase and rutile phases. They were morphology TiO2 nanorods, TiO2 nanowires and TiO2 nano shape with the diameters of about 30-300 nm. The EDX analysis of an area containing a large amount of TiO2 nanostructure reveals the existence of Na, Ti and O elements. © (2013) Trans Tech Publications, Switzerland.

Sutthinet C.,King Mongkuts University of Technology Thonburi | Phetchakul T.,King Mongkuts University of Technology Thonburi | Luanatikomkul W.,King Mongkuts University of Technology Thonburi | Poyai A.,Thai Microelectronic Center
2015 IEEE 10th International Conference on Nano/Micro Engineered and Molecular Systems, NEMS 2015 | Year: 2015

This research presents the multi-sensor that can detect both magnetic field and photo in the one device. The structure is based on p-n junction diode that is the fundamental of light detecting. The idea is how to design p-n junction for magnetic field. The dual magneto diode structure is a solution. It is designed to be suitable for these purposes. The device is specially designed and simulation by Sentaurus TCAD. It is fabricated by standard CMOS process and measured the responses of magnetic field and light. It shows a good device that detects two types of energy equally well. The relative sensitivity of magnetic response is 57 mT-1 at forward bias 1 mA and 128 mT-1 at reverse 8 nA. The dark current of device is 7.34 mA at standard test condition (25°C, AM 1.5, 100 W/m2). It is current mode device generating photo current and cathode current difference that is linearly induced from magnetic field. © 2015 IEEE.

Amrit R.,National Electronics and Computer Technology Center | Sripumkhai W.,Thai Microelectronic Center | Porntheeraphat S.,National Electronics and Computer Technology Center | Jeamsaksiri W.,Thai Microelectronic Center | And 2 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

Faster and reliable testing technique to count and identify nematode species resided in plant roots is therefore essential for export control and certification. This work proposes utilizing a multichannel microfluidic chip with an integrated flow-through microfilter to retain the nematodes in a trapping chamber. When trapped, it is rather simple and convenient to capture images of the nematodes and later identify their species by a trained technician. Multiple samples can be tested in parallel using the proposed microfluidic chip therefore increasing number of samples tested per day. © 2013 SPIE.

Amnuyswat K.,King Mongkuts University of Technology Thonburi | Saributr C.,King Mongkuts University of Technology Thonburi | Thanomngam P.,King Mongkuts University of Technology Thonburi | Sungthong A.,King Mongkuts University of Technology Thonburi | And 3 more authors.
X-Ray Spectrometry | Year: 2013

Local structure of indium oxynitride thin films grown on silicon substrates was investigated by X-ray absorption fine structure technique incorporated with first principle calculations. The thin films were grown by using reactive gas timing radio frequency (RF) magnetron sputtering technique with nitrogen (N2) and oxygen (O2) as reactive gasses. The reactive gasses were interchangeably fed into sputtering system at five different time intervals. The gas feeding time intervals of N2:O2 are 30:0, 30:5, 30:10, 30:20 and 10:30s, respectively. The analysis results can be divided into three main categories. Firstly, the films grown with 30:0 and 30:5s gas feeding time intervals are wurtzite structure indium nitride with 25 and 43% oxygen contaminations, respectively. Secondary, the film grown with 10:30s gas feeding time intervals is bixbyite structure indium oxide. Finally, the films are alloying between indium nitride and indium oxide for other growth condition. The fitted radial distribution spectra, the structural parameters and the combination ratios of the alloys are discussed. © 2012 John Wiley & Sons, Ltd.

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