Nukeaw, Jiti

Preferred name

Nukeaw, Jiti

Alternative Name

Nukeaw, J.

Nukeaw, Jitti

Nukeaw, Jiji

Main Affiliation

Integrated Innovative Technology

jiti.nu@kmitl.ac.th

Now showing 1 - 10 of 122

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Metal Oxide Nanostructures Enhanced Microfluidic Platform for Efficient and Sensitive Immunofluorescence Detection of Dengue Virus
(2023-11-01)
Pormrungruang, Pareesa
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Phanthanawiboon, Supranee
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Jessadaluk, Sukittaya
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Larpthavee, Preeda
;
Thaosing, Jiraphon
Rapid and sensitive detection of Dengue virus remains a critical challenge in global public health. This study presents the development and evaluation of a Zinc Oxide nanorod (ZnO NR)-surface-integrated microfluidic platform for the early detection of Dengue virus. Utilizing a seed-assisted hydrothermal synthesis method, high-purity ZnO NRs were synthesized, characterized by their hexagonal wurtzite structure and a high surface-to-volume ratio, offering abundant binding sites for bioconjugation. Further, a comparative analysis demonstrated that the ZnO NR substrate outperformed traditional bare glass substrates in functionalization efficiency with 4G2 monoclonal antibody (mAb). Subsequent optimization of the functionalization process identified 4% (3-Glycidyloxypropyl)trimethoxysilane (GPTMS) as the most effective surface modifier. The integration of this substrate within a herringbone-structured microfluidic platform resulted in a robust device for immunofluorescence detection of DENV-3. The limit of detection (LOD) for DENV-3 was observed to be as low as 3.1 × 10−4 ng/mL, highlighting the remarkable sensitivity of the ZnO NR-integrated microfluidic device. This study emphasizes the potential of ZnO NRs and the developed microfluidic platform for the early detection of DENV-3, with possible expansion to other biological targets, hence paving the way for enhanced public health responses and improved disease management strategies.
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Heavy metal detection by electrochemical electronic tongue with poly(thiophene)-metal oxide nanoparticle composite electrodes
(2011-12-01)
Saeteaw, Kanjana
;
Tumcharern, Gamolwan
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Piyakulawat, Phimwipha
;
Asawapirom, Udom
;
Porntheeraphat, Supanit
Rapid monitoring methods of heavy metals in water are in great demand for industrial environmental managements. This work aims to develop a heavy metal sensing device based on an electrochemical electronic tongue using a hybrid composite of metal oxide nanoparticles and conductive polymer as the working electrodes. The electrodes were prepared by drop-casting colloidal mixtures of Regioregular poly(3-hexylthiophene) (P3HT) and metal oxide nanoparticles (ZnO or TiO <inf>2</inf>) in chloroform onto a fluorine-doped tin oxide (FTO) glass. Optical microscopy measurements reveal some microstructural organization of the metal oxide-P3HT composite films on the electrodes, in comparison to a smooth P3HT film. Cyclic voltammetry (CV) measurements using bare FTO, P3HT, P3HT/ZnO and P3HT/TiO <inf>2</inf> electrodes were performed on aqueous solutions of various metal acetates at the concentration of 0.01M. The Principal Component Analysis (PCA) was applied to the CV results to obtain the classification of the data from the various metal salt solutions. The PCA score plot exhibits a clear separation of the data groups of different heavy metals, with the highest distinction between zinc and lead. The PCA loading plot confirms that the different electrochemical nature of the various electrodes is responsible for such distinctive classification. Further work is to examine the capability of the electrochemical electronic tongues for semi-quantitative analyses of the metal salt concentration. © 2011 IEEE.
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Effect of annealing temperature on TiO2 structured films by the glancing angle deposition with incline spinning substrate on rotating holder method
(2011-10-13)
Mekla, Vatcharinkorn
;
Pukird, Supakorn
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Porntheerapat, Supanit
;
Nukeaw, Jiti
This work reports the effects of annealing on the TiO<inf>2</inf> 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 , 600 C and 700 C for 2 hr in air. The microstructure of films was studied by UV- visible photometer, X-ray diffraction, XRD and field emission scanning electron microscope, FE-SEM. The results showed the sample films exhibited continuity distribution of the crystalline. The XRD peaks of anatase phase were increased slightly vary with annealing temperature. The porosity of films has been changed with increasing temperature. The film with annealing at 500 C showed the percentage of transferring range of 442-800 nm wavelengths and the maximum absorption of light at 418 nm wavelengths. The calculation evidenced the energy band gap of TiO<inf>2</inf> nanostructures was around 3.41 eV. © 2011 IEEE.
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Cell phone-based two-dimensional spectral analysis for banana ripeness estimation
(2012-06-20)
Intaravanne, Yuttana
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Sumriddetchkajorn, Sarun
;
Nukeaw, Jiti
It is known that when green fruits such as bananas and mangoes grow from the immature to the ripe stages, their color changes from green to yellow. However, once the green fruits are yellow, it is difficult to classify them into the ripe and the overripe stages. Here, we propose and experimentally demonstrate for the first time a two-dimensional banana ripeness level sensor by using a cell phone. Our key approach relies on simultaneous analysis of two broad-spectral images of the banana under white light and ultraviolet illuminations. Particularly, our selected color ratios from these two broad-spectral images are used for spatially and specifically classifying the whole banana into immature, ripe, and overripe zones. Experimental proof of concept using a smart mobile phone is highlighted, featuring fast response, portability, and ease of implementation. © 2012 Elsevier B.V.
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Silicon nitride thin films deposited by reactive gas-timing magnetron sputtering for protective coating applications
(2015-01-01)
Khemasiri, N.
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Paleeya, N.
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Sae-tang Phromyothin, D.
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Horprathum, M.
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Porntheeraphat, S.
Silicon nitride is a promising alternative to carbon based materials for protective coatings, owing to its compatibility with existing silicon-based microfabrication. The complexity of the fabrication processes and contaminations hamper fine-tuning to obtain desirable coating properties. We have explored the reactive gas-timing rf plasma sputtering technique for silicon nitride thin film deposition as an alternative method to fine-tune the film properties. The gas-timing technique controls the on-off sequence of the sputtering gas (Ar) and the reactive gas (N<inf>2</inf>) during deposition. We focus this investigation to the effect of the Ar:N<inf>2</inf> gas timing ratio (10:0, 10:1, 10:3, 10:5, 10:7 and 10:10) on the composition, the morphology, the corrosion resistance, and the hardness properties of the films, in comparison to the films deposited by conventional reactive sputtering with Ar-N<inf>2</inf> gas mixture. These deposited silicon nitride films were characterized by Auger electron spectroscopy, Raman spectroscopy, and atomic force microscopy. The chemical resistance was measured by the electrochemical corrosion test in sulfuric acid, while the hardness properties were obtained by nanoindentation. The results reveal that although the nitrogen content in the films increases only slightly when the N<inf>2</inf> timing is prolonged, the corrosive current of the films decreases abruptly. A thin passivating oxidized layer is found to play a major role in the corrosion resistance. In contrast, the hardness properties exhibit a uniform variation with the N<inf>2</inf> timing. The gas-timing sequence may induce morphological changes the underlying silicon nitride films. The highest hardness obtained by the gas-timing technique almost doubles that produced by the conventional mixed gas sputtering. Thus the reactive gas-timing technique suggests a new route to selectively control the properties of silicon nitride films with minor modification to existing microfabrication processes.
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A Free-space interferometric refractometer structure with simple microfluidic chips
(2012-01-01)
Sumriddetchkajorn, Sarun
;
Chaitavon, Kosom
;
Nukeaw, Jiti
We introduce and experimentally demonstrate an optofluidics-based refractometer structure arranged in a simple free-space Young interferometer design. Our key idea is based on the use of a very simple microfluidic chip structure that consists of one or two flow channels arranged in parallel. We then pass the optical beam through the flow channels of the microfluidic chip. Behind the flow channels, there are two small apertures where the incident optical beam is automatically divided into two optical beams. These two optical beams are propagating in free space for a desired distance before they interfere with each other at the observation plane. Key features include simplicity in design, ease of implementation, and robustness. In the experimental demonstration, we use a 655-nm wavelength laser diode; the free-space propagation distance is 57.5 cm. The two-channel microfluidic chip has a 900-μm channel spacing, a 100-μm channel width, and a 100-μm channel depth (i.e., d/L = 9). Results indicate a sensitivity of 1.34 × 10 -4 RIU in measuring the refractive index of the sucrose solution which clearly agrees with the theoretical analysis. A higher sensitivity of 6.19 × 10 -6 RIU is also accomplished when the single-channel microfluidic chip with a measured d/L ratio of 0.52 is combined with an optical mask having a 600-μm channel spacing. © 2011 IEEE.
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Modulation spectroscopy study of inorganic-organic hybrid quantum well-like nanostructures
(2007-08-28)
Nukeaw, J.
;
Rahong, S.
The optical transition energy in zinc selenide (ZnSe)/tris(8- hydroxyquinoline) aluminum (Alq3) /N,N'-Bis(3-methyphenyl)-N,N -diphenylbenzidine inorganic-organic hybrid quantum well-like nanostructures (hybrid QW-like nanostructure) with well thickness of Aq3 from 10 to 50 nm were investigated by modulation spectroscopy as electroreflectance (ER) measurements. ER features due to optical transition energy were observed in the hybrid QW of well thickness. The transition energies were determined by fitting the ER spectra to the theoretical line-shape expression. The subband transition energy decreased with increasing well thickness might be due to the increase of well results in the reduction of quantum confinement energy. © 2007 IEEE.
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Application of double gate ion sensitive field effect transistor for detection of fluid flow rate in micro-channel
(2010-02-05)
Jiemsakul, T.
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Trithaveesak, O.
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Bunjongpru, W.
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Hruanun, C.
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Poyai, A.
In this work a micro flow sensor, using a double gate Ion Sensitive Field Effect Transistor (ISFET) and two metal electrodes, for fluid flow rate measurement in micro-channels were fabricated and demonstrated. By the channel fabrication the molds were patterned reversely on a silicon wafer using Deep Reactive Ion Etcher (DRIE). The double gate ISFET and two metal electrodes were placed on the mold in the distance 15 millimeters. The channels were formed using polydimethylsiloxane (PDMS) from the mold with the width 1000 and 2000 micrometer and the depth of 250 micrometer. After removing PDMS from the mold the channel was bonded with glass substrate by RF plasma technique. By the verification of flow sensors working range water and one mole of sodium nitrate solution were alternated in flow channel. The fluid flow rate were compared with the flow rate from weighing. It found from the comparison that the high deviation was found at low flow rate. Furthermore, the deviation depends also on the dimension of the flow channel. © (2010) Trans Tech Publications.
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Highly-sensitive optofluidics-based single-flow-channel refractometer structure
(2011-12-01)
Chaitavon, Kosom
;
Sumriddetchkajorn, Sarun
;
Nukeaw, Jiti
This paper shows how only a single-channel microfluidic chip when deployed in our interferometric optofluidics-based refractometer can offer a very high sensitivity of 6.16x10-6 RIU/pixel suitable for sensitive bio and chemical sensing applications. © 2011 AOS.
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Characterization of copper phthalocyanine thin film photovoltaic on PET substrate prepared by electron-beam evaporation technique
(2010-05-05)
Nukeaw, Jiti
;
Tunhoo, Benchapol
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.

Nukeaw, Jiti

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