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Electron Injection Process of Porphyrin Dye into Heterogeneous TiO<sub>2</sub>/Re(I) Photocatalyst
이대한,최성한,최민수,나수원,김철훈,강상욱,손호진 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
The net hetero-collisional electron transfer from the non-anchored fluorescent porphyrin sensitizer to the TiO<sub>2</sub> catalytic particles was a major event during the initial stage of the catalysis. According to in situ UV-Vis absorption spectroscopy and mass analysis of dye solution filtered after photolysis, the initially added porphyrin dye experienced a significant photodegradation accompanied by a breakage of π-conjugation and loss of the bulky substituents. Acetyl- or ethyl-group modified porphyrins were prepared, respectively referred to as ZnP<sub>Acet</sub> and ZnP<sub>Et</sub>, and this modification elevated the corresponding excited-state energy levels when comparing ZnP with ZnP<sub>Et</sub>, consequently shortening the activity delay at the early stage of photolysis. Thus, chemical modification had a favorable effect on the photosensitizing and electron transportation abilities of the dye.
Photophysical Properties of Bulky Substituent on the Homoleptic Iridium(III) Complexes
이대한,백창현,김진형,강상욱,손호진 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
A new series of homoleptic cyclometalated iridium(III) complexes based on the phenylpyridine (ppy) ligand containing bulky substituents synthesized and characterized. Comparison of the results with those of the reference Ir(ppy)3 reveal that the emission color and photophysical properties of the other Ir complexes are influenced by the electrondonating groups attached to the ppy ligand. Systematic red-shifts are observed by increasing the electron-donating ability. The emission spectrum of Ir(Me-ppy)3, having small electron-donating group, is red-shifted; but, the emission quantum yield is low and the nonradiative decay constant is large. Otherwise, although bulky phenyl derivative-adducts also exhibit red-shifted emission, but their kinetic and photophysical behaviors are more optimal than those of Ir(Meppy) 3, whose behavior does not follow the energy gap law. This deviation may be attributed to the rigid environment associated with the steric hindrance of a bulky substituent.
이대한,이성태,임성기 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
The addition of ZrO<sub>2</sub> to Na<sup>+</sup>-beta-alumina improve both fracture toughness and strength without compromising the superionic's electrical properties. ZrO<sub>2</sub> powder was added that the content of ZrO<sub>2</sub> may be in a range of 0 to 10 wt%. To prepare sintered ZrO<sub>2</sub> doped beta-alumina specimen, mixed matrix were sintered for 30 min at 1650°C. This effect of ZrO<sub>2</sub> dopant with pure beta-alumina has been investigated with microstructure and ionic conductivity.