15 Result(s)
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Article
Hwan-Kyu Kim
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Article
Open AccessUnassisted photoelectrochemical water splitting exceeding 7% solar-to-hydrogen conversion efficiency using photon recycling
Various tandem cell configurations have been reported for highly efficient and spontaneous hydrogen production from photoelectrochemical solar water splitting. However, there is a contradiction between two mai...
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Open AccessDirect nitrogen fixation at the edges of graphene nanoplatelets as efficient electrocatalysts for energy conversion
Nitrogen fixation is essential for the synthesis of many important chemicals (e.g., fertilizers, explosives) and basic building blocks for all forms of life (e.g., nucleotides for DNA and RNA, amino acids for pro...
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Lanthanide(III) dendrimer complexes based on diphenylquinoxaline derivatives for photonic amplification
A series of novel lanthanide(III) complexes (Ln=Gd, Er, Yb) based on dendritic diphenylquinoxaline (DPQ) ligands was designed and synthesized with the aim of enhancing the luminescence intensity of Er3+ and Yb3+ ...
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Excited-state intramolecular proton transfer on 2-(2′-hydroxy-4′-R-phenyl)benzothiazole nanoparticles and fluorescence wavelength depending on substituent and temperature
The fluorescence emission properties of 2-(2′-hydroxy-4′-R-phenyl)benzothiazole (HBT-R) nanoparticles with different substituents (R =-COOH,-H,-CH3,-OH, and-OCH3) were investigated using spectroscopic and theoret...
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Novel Erbium(III)-encapsulated complexes based on π-extended anthracene ligands bearing G3-aryl-ether dendron: synthesis and photophysical studies
A series of inert and photo-stable Er(III)-encapsulated complexes based on β-extended dendritic anthracene ligands bearing G3-aryl-ether dendron ([G3-AnX]-CO2H), which retain different π-bridging systems, such as...
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Molecular design and photophysical criteria for lanthanide emission enhancement in erbium(III)-cored complexes based on dendritic ligands for information technology
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Molecular Design, Synthesis and Luminescent Properties of Erbium(III)-Cored Supramolecular Complexes Based on Metalloporphyrins for Optical Amplification
We have investigated the development of erbium(III)-cored supramolecular complexes containing metalloporphyrins to circumvent the solubility problem and improve the optical amplification property. The new synt...
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Lanthanide-cored supramolecular systems with highly efficient light-harvesting dendritic arrays towards tomorrow’s information technology
We have developed novel lanthanide-cored supramolecular systems with highly efficient light-harvesting dendritic arrays for integrated planar waveguide-typed amplifiers. Er3+ ions were encapsulated by the supramo...
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A new class of poly(1,6-heptadiyne)-based photorefractive materials by metathesis polymerization
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Synthesis and electro-optical properties of methacrylate polymers containing hexyl sulfone stilbene chromophore
Methacrylate polymers bearing pendant stilbene chromophore containing 4′-dialkylamino electron donor and 4-hexylsulfonyl electron acceptor has been synthesized. Owing to the introduced flexible alkyl chain to ...
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Synthesis and optical properties of novel side chain NLO organic/inorganic polymers via sol-gel process
Novel side chain NLO organic/inorganic polymers were developed by sol-gel process of dye-contained triethoxysilane with tetraethoxysilane. A NLO moiety based on 4-[N, N-bis(2-hydroxyethyl)amino]-4′-nitrostilbe...
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Phosphonated poly(1,6-heptadiyne) derivatives prepared by metathesis polymerization for nonlinear optics
Poly(triethyldipropargylphosphonoacetate) (TDPA), poly[(tetraethyl dipropargylmethylenediphosphonate) (TDMDP) were prepared by metathesis polymerization using transition-metal catalysts. MoCl5-based catalyst syst...
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Acid-catalyzed photoaromatization of poly(cyclohexadiene-1,2-diol) derivatives into polyphenylene
Substituted poly(cyclohexene)s, used as poly(phenylene) precursors, have been prepared by radical polymerization of cyclohexadiene-1,2-diol derivatives containing various leaving groups. The precursors were co...
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Anions and radicals as intermediates in the reductive coupling of disubstituted dichlorosilanes with sodium
Polymerization of four monomers with alkenyl groups: allylmethyldichlorosilane, allylphenyldichlorosilane, 5-hexenylphenyldichlorosilane and 5-hexenylmethyldichlorosilane was studied by reductive coupling with...
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Homopolymerization and copolymerization of phenyltrichlorosilane by sonochemical reductive coupling in the presence of sodium
Soluble polymers have been prepared by the sonochemical reductive coupling of phenyltrichlorosilane in toluene in the presence of sodium. Copolymers of phenyltrichlorosilane with phenylmethyldi-chlorosilane we...
