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 29

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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.
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The innovative AlN-ISFET based pH sensor
(2008-10-06)
Bunjongpru, W.
;
Porntheeraphat, S.
;
Trithaveesak, O.
;
Somwang, N.
;
Khomdet, P.
This innovative pH-ISFET sensor used nanocrystalline-AlN thin film as ion-sensitive membrane which prepared by reactive gas-timing r.f, magnetron sputtering without heating substrate and post annealing. The technique of gas-timing r.f. magnetron sputtering purposed by us, the feeding gas is on-off controlled periodically in such a way that the deposited AlOxNy film has a quite stable composition of aluminum, nitrogen and oxygen (A1:O:N=52:18:30 %) all over the entire film. The AlN-ISFET devices were structured. The pH-sensitivity characteristics show increasing sensitivity depended on film thickness. The highest sensitivity is 54.50 mV/pH achieved from 80 nm of AlN thin film which is comparable to our previous report Si<inf>3</inf>N<inf>4</inf>-ISFET devices. © 2008 IEEE.
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Properties of CuPc/Se organics-inorganic hybrid thin films growth by electron beam evaporation technique
(2007-12-01)
Tunhoo, Benchapol
;
Thiwawong, Thutiyaporn
;
Nukeaw, Jiti
Organic and Inorganic materials with copper (II) phthalocyanine (CuPc) and selenium (Se) were deposited to implement hybrid thin Alms by multi pocket electron beam evaporation technique. Crystallization of hybrid films was performed by x-ray diffraction (XRD) spectroscopy. XRD pattern exhibits monoclinic α-phase crystallizations structure of CuPc. Influences of the CuPc thickness on the crystalline structure of selenium films were obtained. As the thickness of CuPc layer was increased to 100 nm, the hexagonal Se was observed. Optical absorption spectra were measured by UV-Visible spectrophotometer. Results of hybrid absorption spectra were revealed to absorption spectra of CuPc and Se. Surface roughness of films can confirm with XRD spectra .The surface morphology was characterized by atomic force microscope (AFM) with non-contact mode, it illustrate the point that hybrid thin films is nanocrystal structure. © 2007 IEEE.
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Organic vaporensors based on single-walled CNTs
(2006-12-01)
Chaisitsak, Sutichai
;
Chaithongrat, Buaworn
;
Nukeaw, Jiji
;
Tuantranont, Adisorn
An investigation of the influence of organic vapor (ethanol, methanol and acetone) on the characteristics of simple-structure sensors fabricated from single-walled carbon nanotube (SWCNT) thin films is reported. SWCNTs were directly deposited, by using atmospheric pressure CVD using alcohol-ferrocene mist, on the patterned Al electrodes to fabricate a sensor. It was found that the characteristic of SWCNT-based sensors depended on the depositing position in CVD reactor. The sensor response could be optimized by adjusting the depositing position along the inner quartz reactor. The sensor reproducibility could be improved by light soaking after switching to air. © 2006 IEEE.
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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.
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Optical properties and structure of copper (II) phthalocyanine(CuPc) organic thin film grown by electron - Beam evaporation technique
(2007-08-28)
Tunhoo, Benchapol
;
Nukeaw, Jiti
Copper (II) Phthalocyanine (CuPc) thin films were grown by electron beam evaporation technique with various substrate temperatures. Crystalline of CuPc thin films was investigated by x-ray diffraction (XRD) spectroscopy. Diffraction pattern exhibit high quality crystalline films as monoclinic α-phase structure. Surface morphology of CuPc thin films was characterized by field emission electron microscope (FE-SEM) and the films grown with 150 °C substrate temperature illustrated nanorod-like structure. Absorption spectra were obtained by UV/Visible spectroscopy, revealed to Q-band and B-band. The transition energy of CuPc was characterized by photoreflectance spectroscopy (PR) correspond to an absorption peak of Q-band. © 2007 IEEE.
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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.
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Structural and optical properties of CuPc/ZnSe multilayer hybrid thin films prepared by electron beam evaporator
(2007-12-01)
Thiwawong, Thutiyaporn
;
Tunhoo, Benchapol
;
Nukeaw, Jiti
Multilayer hybrid thin films consisting of alternating layers of organic and inorganic materials were fabricated with powder of copper-phthalocyanine (CuPc) and zinc selenide (ZnSe) by electron beam evaporator. The structural and optical characterization of multilayer hybrid thin film were carried out by using X-ray diffraction (XRD), atomic force microscope (AFM) and UV-Vis absorption spectroscopy. XRD patterns show two peaks of the orientation of (200) plane monoclinic structure in CuPc material and (111) plane cubic structure in ZnSe material where pair numbers of multilayer hybrid thin film higher than two pairs. With the variation in the number of pairs of CuPc/ZnSe, AFM images present almost similar morphology but the optical absorption spectra are significantly changed. Such spectral changes can be interpreted by the effect of the aggregate size and the characteristic of the multilayer hybrid structure. © 2007 IEEE.
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The effects of substrate temperature on optical properties and surface morphology of nickel phthalocyanine thin films grown by organic evaporator system
(2008-01-01)
Inchidjuy, P.
;
Pukird, S.
;
Nukeaw, J.
Thin films of Nickel Phthalocyanine (NiPc) are prepared at a base pressure of 10<sup>-6</sup> mbar using Organic Evaporator System. The films are deposited onto the glass substrate at various temperatures of 100 °C, 120 °C, 140 °C and 160 °C. Crystalline of NiPc thin films was investigated by X-ray diffraction (XRD) spectroscopy. XRD patterns exhibit to become aggravated crystalline films as monoclinic structure. Surface morphology of NiPc thin films was characterized by field emission scanning electron microscope (FE-SEM). FE-SEM micrographs indicate that fiber-like morphology of NiPc is enhanced with increasing substrate temperature. The optical absorption spectra of these thin films are measured. Present studies reveal that the Q-band of NiPc thin films appears as the change of electron energy level. Absorption spectra obtained from UV-vis of deposited NiPc are declined as the substrate temperature is risen. © 2008 Trans Tech Publications, Switzerland.
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The effect of substrate temperature on structure and optical properties of copper (II) phthalocyanine (CuPc) thin films prepared by organic evaporation
(2007-08-28)
Kamoldilok, Surachart
;
Tunhoo, Benchapol
;
Sumriddetchkajorn, Sarun
;
Nukeaw, Jiti
The influence of substrate temperature controls on Copper (II) phthalocyanine (CuPc) organic thin films onto glass substrate by organic evaporation system has been examined by X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM) and UV-VIS spectrophotometer. The two control methods are an on-off switching temperature control and a phase temperature control. The various substrate temperatures were controlled at 27, 80, 100, 120 and 150 °C, respectively. The thickness of all thin films is 30 nm. The XRD results from both methods show strongly peaks in orientation of [200] plane as α-phase monoclinic structure. By an on-off switching controlled temperature, the intensity of XRD peaks is increased with increasing substrate temperature. While intensity of XRD results from a phase controlled temperature shows increasing from 27 to 100 °C but decreasing from 120 to 150 °C. The CuPc grown at 150 °C exhibits nanorod-like structure obtained from an on-off switching temperature control and fiber-like structures obtained from a phase temperature controls. The optical absorptions of CuPc thin films of both methods determined from UV-VIS spectrophotometer show two strong peaks at 330 nm and 620 nm, denoted the B-band and Q-band, respectively. © 2007 IEEE.

Nukeaw, Jiti

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