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 55

Some of the metrics are blocked by your
consent settings
Growth and characterization of zinc oxynitride thin films by reactive gas-timing RF magnetron sputtering
(2008-01-22)
Klaitabtim, Don
;
Pratontep, Sirapat
;
Nukeaw, Jiti
Nitrogen-doped zinc oxide (N:ZnO) films on glass substrates have been prepared by the reactive gas-timing rf magnetron sputtering of ZnO targets in a mixture of argon and nitrogen gases. Using this gas-timing technique, N:ZnO films were produced without any substrate heating. The nitrogen partial pressure during the sputtering process was periodically controlled by an on-off sequence. The structural and optical properties of the fabricated films were analyzed by X-ray diffraction (XRD) and optical absorption spectroscopy, respectively. The nitrogen composition of the N:ZnO films was quantified by X-ray photoelectron spectroscopy (XPS). In this study, we focused on investigating the effects of the nitrogen flow rate and the rf power on the structural properties, the nitrogen doping efficiency, and the optical band gap of N:ZnO films. A slight shift in the optical band gap to a higher energy was found when the nitrogen flow rate was increased or when the rf power was decreased. This coincides with an improvement in the crystallinity of the films. Gas-timing rf magnetron sputtering deposition is a simple method of fine-tuning material properties by slight modifications to the existing sputtering technique. © 2008 The Japan Society of Applied Physics.
Some of the metrics are blocked by your
consent settings
Metal Oxide Nanostructures Enhanced Microfluidic Platform for Efficient and Sensitive Immunofluorescence Detection of Dengue Virus
(2023-11-01)
Pormrungruang, Pareesa
;
Phanthanawiboon, Supranee
;
Jessadaluk, Sukittaya
;
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<sup>−4</sup> 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.
Some of the metrics are blocked by your
consent settings
Optical band engineering of metal-oxynitride based on tantalum oxide thin film fabricated via reactive gas-timing RF magnetron sputtering
(2016-11-25)
Khemasiri, N.
;
Jessadaluk, S.
;
Chananonnawathorn, C.
;
Vuttivong, S.
;
Lertvanithphol, T.
In this paper, we demonstrate a novel technique, as called reactive gas-timing (RGT) RF magnetron sputtering, to control and design an optical band engineering of TaON thin films without an external heating substrate temperature and post annealing treatment process. The influence of the oxygen intervals ranged from 5 to 60 s on deposition rate, chemical composition and optical properties of TaON thin films were investigated. The chemical composition was characterized by auger electron spectroscopy (AES). The optical properties were determined by UV–Vis spectrophotometer and spectroscopic ellipsometry. The nitrogen atomic concentration of the TaON thin films deposited by RGT decreased when the oxygen gas-timing intervals increased. In addition, the RGT sputtered TaON films could be demonstrated band gaps engineering from 1.90 to 2.15 eV.
Some of the metrics are blocked by your
consent settings
The enhancement of sensitivity and response times of PDMS-based capacitive force sensor by means of active layer modification
(2021-06-01)
Siangkhio, Yasumin
;
Rangkasikorn, Adirek
;
Tammarugwattana, Narin
;
Kayunkid, Navaphun
;
Jessadaluk, Sukittiya
In this work, sensitivity and response times of PDMS-based capacitive force sensors are enhanced via the modifications of the PDMS layer. Two modifying approaches are proposed; (i) change PDMS's (elastomer:curing agent) ratio and (ii) adding conductive polymer PEDOT:PSS into the PDMS layer. The change of PDMS (elastomer:curing agent) ratio from (10:1) to (30:1) increases the sensitivity from 0.4 0.08 to 0.72 0.23 kPa-1 (+80%) but it does not significantly affect the response/recovery times. In addition, by adding 1% wt. of PEDOT:PSS to PDMS (30:1), the further increment of sensitivity from 0.72 0.23 to 1.44 0.17 kPa-1 (+100%) and the shorter response time from 1.59 0.02 to 0.45 0.03 s (-72%) are observed. The mechanical and electrical studies reveal that the change of PDMS (elastomer:curing agent) ratio and the adding of PEDOT:PSS to PDMS layer result in the modification of PDMS's deformability and the increase of charge transportation, leading to the enhancement of sensing characteristics of the sensors.
Some of the metrics are blocked by your
consent settings
Growth and characterization of novel optoelectronic materials. Based on II-VI inorganic/organic heterostructures
(2006-01-01)
Pecharapa, Wisanu
;
Keawprajak, Anusit
;
Kayunkid, Nawapun
;
Rahong, Sakon
;
Yindeesuk, Witoon
Novel optoelectronic materials based on II-VI inorganic/organic low-dimensional heterostructure were successfully grown by electron beam evaporator. The structures were based on ZnSe, tris(8-hydroxyquinoline) aluminum (Alq<inf>3</inf>) and N,N'-bis(3-methylphenyl)-N,N'-diphenyl-benzidine (TPD). The surface morphology of the structures was investigated by atomic force microscopy and field emission scanning electron microscope. The optical and electronic properties were examined by photoluminescence, photocurrent and electroreflectance spectroscopy. Photoluminescence spectra of the ZnSe/Alq <inf>3</inf>/ZnSe structure attributed to the change of exciton energy as a result of quantum confinement showed the formation of single quantum well structure. The luminescence color can be varied by changing the thickness of the Alq<inf>3</inf> layer. The other heterostructure of ZnSe/Alq<inf>3</inf>/TPD was grown on silicon substrate. The wavelength response of this structure shown by photocurrent signal ranged from 450 nm to 1100 nm. Electroreflectance features due to optical transition energy of the single quantum well of this structure were also observed. Under applied voltage, electroreflectance signals showed significant shift due to the quantum confined Stark effect.
Some of the metrics are blocked by your
consent settings
Improved selectivity, response time and recovery time by [0 1 0] highly preferred-orientation silicalite-1 layer coated on SnO2 thin film sensor for selective ethylene gas detection
(2010-01-29)
Jadsadapattarakul, Damrongsak
;
Thanachayanont, Chanchana
;
Nukeaw, Jiti
;
Sooknoi, Tawan
In this work, sensing response, response time and recovery time for selective ethylene gas detection were improved by coating a layer of [0 1 0] highly preferred-orientation silicalite-1 polycrystals on SnO<inf>2</inf> thin film sensors. The sensors were prepared by primarily depositing SnO<inf>2</inf> on borosilicate glass substrates using ultrasonic spray pyrolysis technique. Conventional and [0 1 0] preferred orientations of silicalite-1 layers were then directly coated on the SnO<inf>2</inf> thin film sensors by hydrothermal crystallization technique with different gel compositions. The silicalite-1/SnO<inf>2</inf> thin film sensors were calcined at 550 °C in dry air. The crystal structure and surface morphology of SnO<inf>2</inf> and silicalite-1 layers were characterized by XRD and SEM techniques. XANES and TPR were used to verify oxidation state and reduction temperature of the SnO<inf>2</inf> thin film sensors, respectively. The interaction of C<inf>2</inf>H<inf>4</inf> and H<inf>2</inf>O with silicalite-1 was determined by TPD. The sensing performances, such as selectivity, dynamic range, response time and recovery time were evaluated for the C<inf>2</inf>H<inf>4</inf> and H<inf>2</inf>O. The results showed that the incorporated silicalite-1 layers readily improve the C<inf>2</inf>H<inf>4</inf> selectivity and dynamic range by preferential adsorption of C<inf>2</inf>H<inf>4</inf> molecules on the silicalite-1 filtering layers. The response time and recovery time for the [0 1 0] highly preferred-orientation silicalite-1/SnO<inf>2</inf> thin film sensor (t<inf>90%</inf>, 14 and 144 s) were shorter than those of the conventional one (t<inf>90%</inf>, 25 and 208 s). It is suggested that the [0 1 0] preferred-orientation silicalite-1, with a pore direction perpendicular to SnO<inf>2</inf> thin film surface, can accelerate the molecular diffusion and reduce the diffusion pathway of ethylene to the sensing film. © 2009 Elsevier B.V.
Some of the metrics are blocked by your
consent settings
Electroreflectance and photocurrent measurement of ZnSe/Alq 3/TPD heterostructure on Si-substrate
(2005-11-20)
Pecharapa, W.
;
Keawprajak, A.
;
Kayunkid, N.
;
Rahong, S.
;
Yindeesuk, W.
The optical transition energy in ZnSe/tris(8-hydroxyquinoline) aluminum (Alq<inf>3</inf>)/N,N′-bis(3-methylphenyl)-N,N′-diphenyl-benzidine (TPD) heterostructure were investigated by room-temperature electroreflectance (ER) and photocurrent (PC) measurements. PC signal showed wavelength response of the device in the range of 450-1100 nm. ER features due to optical transition energy of the single quantum well of this structure were observed. 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. Under applied voltage, both ER signals show significant shift due to the quantum confined Stark effect. © 2005 Elsevier B.V. All rights reserved.
Some of the metrics are blocked by your
consent settings
Efficiency of SPIONs functionalized with polyethylene glycol bis(amine) for heavy metal removal
(2016-09-15)
Wanna, Yongyuth
;
Chindaduang, Anon
;
Tumcharern, Gamolwan
;
Phromyothin, Darinee
;
Porntheerapat, Supanit
Hybrid magnetic nanoparticles based on poly(methylmethacrylate) (PMMA) and super-paramagnetic iron oxide nanopaticles (SPIONs) with selective surface modification has been developed for heavy metal removal by applying external magnetic fields. The nanoparticles were prepared by the emulsion polymerization technique in an aqueous suspension of SPIONs. The hydrolysis of carboxyl functional group was then applied for grafting polyethylene glycol bis(amine)(PEG-bis(amine)) onto the PMMA-coated SPIONs. The morphology, the chemical structure and the magnetic properties of the grafted nanoparticles were investigated. The efficiency of the hybrid nanoparticles for heavy metal removal were conducted on Pb(II), Hg(II), Cu(II) and Co(II) in aqueous solutions.The metal concentration in the solutions after separation by the hybrid nanoparticles was determined by inductively coupled plasma optical emission spectrometer (ICP-OES). The results show the heavy metal uptake ratios of 0.08, 0.04, 0.03, and 0.01 mM per gramme of the grafted SPIONs for Pb(II), Hg(II), Cu(II), and Co(II), respectively. A competitive removal of Cu(II), Pb(II), Co(II) and Hg(II) ions in mixed metal salt solutions has also been studied.The heavy metal removal efficiency of the hybrid nanoparitcles was found to depend on the cation radius, in accordance with capture of metal ions by the amine group.
Some of the metrics are blocked by your
consent settings
Modification of a photoanode by means of localized surface plasmon resonance from Au nanoparticles decorated on ZnO nanorods for photoelectrochemical applications
(2019-01-01)
Khemasiri, Narathon
;
Soyeux, Nathan
;
Rattanawarinchai, Prapakorn
;
Jessadaluk, Sukittiya
;
Klamchuen, Annop
Photoelectrochemical (PEC) activity is possibly enhanced by an increase in photocurrent generated from the photoanode. In this work, a modified photoanode that consists of zinc oxide nanorods (ZnO-NRs) decorated with gold nanoparticles (Au-NPs) is proposed to improve the generation of photocurrent. X-ray diffraction and scanning electron microscopy are employed to confirm the decoration of Au-NPs on well-aligned ZnO-NRs. A significant enhancement (∼4 times) in photocurrent density is obtained from the ZnO-NR photoanode decorated with Au-NPs compared to the bare ZnO-NR photoanode. Photoluminescence and UV-visible spectroscopy reveal that the improvement in photocurrent density results from (i) the decrease in charge recombination in the ZnO-NRs due to charge dissociation and (ii) the additional injection of charge from Au-NPs owing to localized surface plasmon resonance. This research presents the idea of taking the benefit from Au-NPs to enhance the photocurrent density in PEC applications through the decrease in charge recombination and the increase in charge injection.
Some of the metrics are blocked by your
consent settings
Cell phone-based two-dimensional spectral analysis for banana ripeness estimation
(2012-06-20)
Intaravanne, Yuttana
;
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.

Nukeaw, Jiti

Filters

Settings

Sort By

Results per page