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朴泰坤 國立 昌原大學校 産業技術硏究所 1987 産技硏論文集 Vol.1 No.-
Transparent ceramics which have quadratic electro-optic effect are fabricated using hotpress. The microstructure of specimens are observed to search the vest way to improve the transmittance. The electro-optic characteristics are analyzed by investigating the ferroelectric properties and the possibility of application to optical shutter is examined by obtaining the on-off characteristics of specimens. To obtain the transparent ceramics it is necessary to eliminate the porosities by using PbO atmosphere. The light intensity as a function of electric field have butterfly type hysteresis curves because of its slightly large saturation remanent polarization and coersive field. On-off characteristics of optical shutter can be obtained by two electric fields. Construction of the optical shutter with composition which has slim hysteresis loop is desired for obtaining the off state by zero electric field.
박태곤,Myong-Ho Kim,Min-Ho Park 한국전기전자재료학회 2004 Transactions on Electrical and Electronic Material Vol.5 No.2
Bolt-tightened Langevin type vibrators using longitudinal mode of bar were designed and fabricated. In order to amplify the displacement of the tip of the vibrators, stacked ceramics were used and five different shapes of the horns were designed and jointed. Resonant frequencies and vibration characteristics of vibrators and horns were analyzed by ANSYS(finite element analysis computer program), and the displacements of tips of the horns were measured. As results, when the numbers of the stacked ceramics were increased, the displacements of the tips were increased and the driving voltages were decreased. Step1 horn (BLT-St1) showed maximum displacement of 36.92 mm at 36.7 kHz with 45 Vrms and 0.11 A. The displacement amplification ratio was about 5.2. But, the stress of step1 horn was concentrated on intersection, where two diameters meet. To lessen the stress, step3 shaped horn is recommended.
리소그래피 없이 제작된 그물망 구조의 은나노와이어-고분자화합물 복합소재 기반 유연 투명전극의 특성
박태곤,박종설,박진석,Park, Tae Gon,Park, Jong Seol,Park, Jin Seok 한국반도체디스플레이기술학회 2020 반도체디스플레이기술학회지 Vol.19 No.4
In this study, a new method for fabricating flexible transparent electrodes based on silver nanowire-polymer (AgNW-PEDOT:PSS) composite materials having a mesh pattern formed by a solution-based process without lithography was proposed. By optimizing conditions such as the amount of ultraviolet (UV) photosensitizer injected into the suspension of AgNW and PEDOT:PSS, UV exposure time, and deionized (DI) washing time, a clear and uniform mesh pattern was obtained. For the fabricated AgNW-PEDOT:PSS-based mesh-type electrodes, characteristics such as electrical sheet resistance, light transmittance, haze, and bending flexibility were analyzed according to the mixing ratio of AgNW and PEDOT:PSS included in the suspension. The fabricated mesh electrodes typically exhibited a low electrical sheet resistance of less than 20 Ω/sq while maintaining a high transmittance of 80% or more. In addition, it was confirmed from the results of analyzing the effect of PEDOT:PSS on the characteristics of the mesh-type AgNW-PEDOT electrode that the optical visibility was greatly enhanced by reducing the surface roughness and haze, and the bending flexibility was remarkably improved.
아조벤젠을 含有한 長鎖脂肪酸의 光異性化 現象에 關한 硏究
朴根浩,朴泰坤 國立 昌原大學校 産業技術硏究所 1994 産技硏論文集 Vol.8 No.-
The Synthesis of p-(p'-octadecyloxy phenylazo)-benzoic acid and p-(p'-hexadecyloxy phenylazo)-benzoic acid were optimized, starting from p-(p'hydroxy phenylazo)-benzoic acid and the product of reaction containing azobenzene chromophores was investigated by ultraviolet spectrophotometery in ethanol solvent at room temperature. In addition, UV absorption spectra of Langmmuir Blodggett(LB) film deposited on quartz plate have been measured and the structure of these compounds were ascertained by means of Ultraviolet and Fourier Transform Infrared spectra. Recrystallization of reaction product in the solvent results the experimental yield obtained about 62.93% p-(p'-octadecyloxy phenyl azo)-benzoic acid. Long chain azobenzene derivatives solution are induced photoisomerization by light irradiation. The LB film of azobenzene containing long chain fatty acids are possible of being applied to functional molecular devices such as photomemory and light switching.
p-Nitroazobenzene 함유한 Polyamic Acid의 합성과 수면상의 변위전류 측정
朴泰坤,朴根浩 國立 昌原大學校 産業技術硏究所 1997 産技硏論文集 Vol.11 No.-
The synthesis of polyamic acid was studied to get optimized conditions. The spectrum of the product of reaction containing azobenzene chromophres was investigated by using ultraviolet spectrophotometry in various solvent at room temperature. Recrystallization of reaction product in ethanol solvent atomosphere results 73.2% monomer, 78.6% anhydride tetracarbonic acid, and 96% polyamic acid. Maxwell displacement current(MDC)measuring technique has been applied on the study of monolayers of polyamic acid. The displacement current was generated from monolayers on the water surface by monolayer compression and expansion. Displacement current was generated when the area per molecule was about 250Ųand 120Ų. The charge flow and Maxwell displacement currents were investigated in connection with monolayer compression cycles. It was found that The maximum of MDCs appeared at the molecular area just before the initial rise of surface pressure in both 1st and 2nd compression cycles.