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정낙관,Ju-Young Yun,Jin-Tae Kim,Jiho Park 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.70 No.9
In this work, we modified the surfaces of BaTiO3 particles by using barium acetate and ammonium bicarbonate, and we studied the characteristics and sintering behaviors of the coated BaTiO3 particles. Transmission electron microscopy showed that the resultant coating layer was smooth and uniform without agglomerates. X-ray photoemission spectroscopy analysis also revealed that the surface coating layer was composed of BaCO3. After calcination at 950 C for 5 hours, the c/a ratio of the coated particles was found to have increased without size growth while the uncoated particles showed size growth. We finally found that the BaCO3 layer acted as a barrier to inhibit particle growth during calcination.
정낙관 한국진공학회 2020 진공 이야기 Vol.7 No.1
Recently, because of global warming and energy depletion problems, Fuel Cell Electric Vehicles (FCEVs), which have no greenhouse gas emissions, have attracted much attention. In order to increase the fuel efficiency of FCEVs, the hydrogen storage tanks are made of plastics, instead of metals. Because they have a relatively high hydrogen permeability than metals, hydrogen leakage may occur. To lower the hydrogen permeation, many researchers have developed the barrier coating technology. In this article, we review the hydrogen permeation mechanism, various barrier coating technologies, and the evaluation methods of the barrier coatings.
남민우,정낙관,심섭,윤주영,김진태,표성규 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.71 No.5
Enhanced electroluminescence in blue organic light-emitting diodes (OLEDs) is obtained by incorporating Ag nanoparticles (NPs) into hole injection layer of poly(3,4- ethylenedioxythiophene):polystyrene sulfonic acid (PEDOT:PSS). The absorption peak of the localized surface plasmons (LSPs) introduced by the 60 nm Ag NPs matches the emission wavelength of the blue OLEDs were matched at wavelength of 442 nm. In addition, to maximize their coupling and to prevent the quenching of the emission, the distance between surface plasmons (SPs) around NPs and organic fluorophores is optimized. Finally, the emission intensity and the current efficiency of diode with Ag NPs were increased by 19% and 18%, respectively.
남민우,정낙관,심섭,이보금,강고루,표성규,윤주영 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Enhanced electroluminescence in blue organic light-emitting diodes is obtained by incorporating silver nanoparticles into the hole injection layer, poly(3,4-ethylene dioxythiophene):polystyrene sulfonic acid (PEDOT:PSS). The wavelength peak of the localized surface plasmons (LSPs) initialized from silver nanoparticles matched with the emission peak of blue organic light-emitting diode results in the resonance effect and enhanced the efficiency of diodes. UV-visible absorption spectra, steady state and time-resolved photoluminescence spectra was studied in order to prove that the improvement of luminescence comes from the plasmonic near-field interaction between localized surface plasmons and the excited excitons from the emission layer.