Thai Microelectronic Center

Nakhon Thai, Thailand

Thai Microelectronic Center

Nakhon Thai, Thailand
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Viphavakit C.,Asian Institute of Technology | Viphavakit C.,Frederick University | Themistos C.,Frederick University | Komodromos M.,Frederick University | And 3 more authors.
Journal of Circuits, Systems and Computers | Year: 2013

The design, fabrication and characterization of an optics based integrated flow rate sensor is presented where the light-fluid interaction is maximized by allowing the liquid and light to propagate along the same direction. The flow rate sensor consists of a 10 μm deep microchannel placed between two waveguides. The optical waveguides were tapered to fit the channel width, to guide light in and out of the microchannel. A tapering mechanism is proposed to minimize the coupling and propagation losses. The power of the output signal from the designed device was calculate through simulation and it was compared with the actual output signal detected by a fast receiver (higher than 1 MHz). The dynamic change of the light intensity when fluid flows through the channel can also be recorded by this receiver. This scheme allows for a direct measurement of the liquid flow rate with higher interaction length between fluid and light with a dynamic range of up to 0.18. An integrated microfluidic device with high precision and sufficient coupling between the light source and the microfluidic channel is proposed. © 2013 World Scientific Publishing Company.


Mekla V.,Ubon Ratchathani University | Pukird S.,Ubon Ratchathani University | Porntheerapat S.,Thai Microelectronic Center | Nukeaw J.,ThEP Center | Nukeaw J.,King Mongkut's University of Technology Thonburi
Advanced Materials Research | Year: 2011

The report presents the effects of the thickness on the TiO2 thin films prepared by the GLAD technique with incline spinning substrate on rotating holder (ISSRH) by using the electron beam evaporation. The prepared films were heated at 500 °C for 2 hr in air. The microstructure of films was investigated by UV- visible photometer, X-ray diffraction, XRD and field emission scanning electron microscope, FE-SEM. The results showed the thickness of 10, 50, 100 and 300 nm films exhibited continuity distribution of the crystalline. The crystalline structure evidenced the dominant peak at the 300 nm thickness. GLAD TiO2 films exhibited the columnar growth and porosity. The TiO2 nanostructures showed rutile phase. © (2011) Trans Tech Publications.


Rahong S.,National Science and Technology Development Agency | Rahong S.,ThEP Center | Saekow B.,King Mongkut's University of Technology Thonburi | Porntheerapat S.,Thai Microelectronic Center | And 4 more authors.
INEC 2010 - 2010 3rd International Nanoelectronics Conference, Proceedings | Year: 2010

The sensitivity of a photonic crystal optical biosensor device can be enhanced through the difference in effective refractive index of dielectric materials. In this work, we report the optical modification of refractive index of PDMS from 1.41 to above, by incorporating the additive materials to enhance the sensitivity of photonic crystal optical biosensor devices. The refractive index of mixed-PDMS materials are measured by ellipsometry technique. The surface and cross section morphologies are characterized by Field-Emission Scanning Electron Microscope (FESEM) and Atomic Force Microscope (AFM). The grating structure of 800 nm period PDMS with low refractive index was fabricated by Nano-Imprinting Lithography (NIL) then the mixed-PDMS with high refractive index was spun on the periodic PDMS as photonic crystal device. The sensitivity of devices is characterized and demonstrated by reflection spectra intensity of fluids on surface of the devices. ©2010 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.


Sutthinet C.,King Mongkut's University of Technology Thonburi | Phetchakul T.,King Mongkut's University of Technology Thonburi | Luanatikomkul W.,King Mongkut's 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.


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.


Saengdee P.,Mahidol University | Chaisriratanakul W.,Thai Microelectronic Center | Bunjongpru W.,Thai Microelectronic Center | Sripumkhai W.,Thai Microelectronic Center | And 5 more authors.
Biosensors and Bioelectronics | Year: 2014

Three different types of surface, silicon dioxide (SiO2), silicon nitride (Si3N4), and titanium oxynitride (TiON) were modified for lactate dehydrogenase (LDH) immobilization using (3-aminopropyl)triethoxysilane (APTES) to obtain an amino layer on each surface. The APTES modified surfaces can directly react with LDH via physical attachment. LDH can be chemically immobilized on those surfaces after incorporation with glutaraldehyde (GA) to obtain aldehyde layers of APTES-GA modified surfaces. The wetting properties, chemical bonding composition, and morphology of the modified surface were determined by contact angle (CA) measurement, Fourier transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM), respectively. In this experiment, the immobilized protein content and LDH activity on each modified surface was used as an indicator of surface modification achievement. The results revealed that both the APTES and APTES-GA treatments successfully link the LDH molecule to those surfaces while retaining its activity. All types of tested surfaces modified with APTES-GA gave better LDH immobilizing efficiency than APTES, especially the SiO2 surface. In addition, the SiO2 surface offered the highest LDH immobilization among tested surfaces, with both APTES and APTES-GA modification. However, TiON and Si3N4 surfaces could be used as alternative candidate materials in the preparation of ion-sensitive field-effect transistor (ISFET) based biosensors, including lactate sensors using immobilized LDH on the ISFET surface. © 2014 Elsevier B.V.


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.


Leepattarapongpan C.,Thai Microelectronic Center | Phetchakul T.,Thai Microelectronic Center | Penpondee N.,Thai Microelectronic Center | Pengpad P.,Thai Microelectronic Center | And 3 more authors.
IEEE Sensors Journal | Year: 2010

This paper presents the three-terminal magneto-transistor based on the carrier recombination-deflection effect. Three-terminal magnetotransistor can detect vertical and lateral magnetic field direction. The structure of magnetotransistor consists of one emitter, one collector and one base contact. The devices can detect magnetic field by relying on the difference between base current and collector current (ΔICB). The result from experiments closely matched the simulated 3-D modeling with base width of 20 μm at substrate thickness of 600 μm. From the experiment, the magnetotransistor had the highest sensitivity of 10.25%/T when emitter current was at 10 mA. This research on the three-terminal magnetotransistor can achieve magnetic sensors with small size, high performance and wide range of applications. © 2009 IEEE.


PubMed | Thai Microelectronic Center and Mahidol University
Type: | Journal: Biosensors & bioelectronics | Year: 2015

Three different types of surface, silicon dioxide (SiO2), silicon nitride (Si3N4), and titanium oxynitride (TiON) were modified for lactate dehydrogenase (LDH) immobilization using (3-aminopropyl)triethoxysilane (APTES) to obtain an amino layer on each surface. The APTES modified surfaces can directly react with LDH via physical attachment. LDH can be chemically immobilized on those surfaces after incorporation with glutaraldehyde (GA) to obtain aldehyde layers of APTES-GA modified surfaces. The wetting properties, chemical bonding composition, and morphology of the modified surface were determined by contact angle (CA) measurement, Fourier transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM), respectively. In this experiment, the immobilized protein content and LDH activity on each modified surface was used as an indicator of surface modification achievement. The results revealed that both the APTES and APTES-GA treatments successfully link the LDH molecule to those surfaces while retaining its activity. All types of tested surfaces modified with APTES-GA gave better LDH immobilizing efficiency than APTES, especially the SiO2 surface. In addition, the SiO2 surface offered the highest LDH immobilization among tested surfaces, with both APTES and APTES-GA modification. However, TiON and Si3N4 surfaces could be used as alternative candidate materials in the preparation of ion-sensitive field-effect transistor (ISFET) based biosensors, including lactate sensors using immobilized LDH on the ISFET surface.

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