Research and Teaching Interests
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Size-dependent Strong Photoluminescence of CdSe Quantum Dots |
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Mn14Al56+xGe3-x (x = 0-0.6) |
The research spans in various areas of inorganic solid-state/materials chemistry dealing with synthesis, characterization and understanding of novel solid-state inorganic materials and composites. The goals are achieved (1) via application of fundamental principles in solid-state sciences for the rational design of target materials and (2) via development of novel synthetic methodologies that can provide unprecedented chemical structures and morphologies.
The materials of our current interest include: itinerant electron magnets such as half metals and giant magnetoresistance materials; low-dimensional semiconductors with complicated chemical and electronic structures; nanostructured transition-metal chalcogenides; II-IV semiconducting quantum dots and their composites. These materials will have applications in spin-electronics, date storage, catalysis, batteries, solid-state lubrication, solar energy conversion, optics and biological sensing and monitoring. The research provides a broad understanding of solid-state materials and the well-established experimental skills which will be needed to undergraduate, graduate and postdoctoral student researchers in their future independent work.
Representative Publications
"Preparation of Large Transparent Silica Monoliths with Embedded Photoluminescent CdSe@ZnS Core/Shell Quantum Dots," Q. Wang, N. Iancu, D.-K. Seo, Chem. Mater. in press, (2005).
"Observation of Unusual Hysteretic Magnetic Properties of the Rare Earth Intermetallic Compound PrMnSi2: Magnetic Susceptibility, Magnetization, Heat Capacity, and Electronic Band Structure Studies," S.-H. Kim, D.-K. Seo, R.K. Kremer, J. Köhler, A. Villesuzanne, M.-H. Whangbo, Chem. Mater. 17, 3711 (2005).
"Electron Precise/Deficient Ln5-xCaxGe4 (x=3.37, 3.66, 3.82 for Ln= La; x=3.00, 3.20, 3.26 for Ce): Probing Low Valence Electron Concentrations in Metal-Rich Gd5Si4-Type Germanides," L.M. Wu, S.K. Kim and D.K. Seo, J. Am. Chem. Soc. in press, (2005).
"Low-Temperature Synthetic Method for Size-Controlled CdSe Nanocrystals: Utilization of Boron Selenide," N. Iancu, R. Sharma and D.-K. Seo, Chem. Comm. in press, (2004).
"New Solid-Gas Metathetical Synthesis of Binary Metal Polysulfides and Sulfides at Intermediate Temperatures: Utilization of Boron Sulfides," L.-M. Wu and D.-K. Seo, J. Am. Chem. Soc. 126, 4676 (2004).
"Mn14Al56+xGe3-x (x = 0-0.6): A New Intermetallic Phase Containing Unprecedented “Half-Broken," L.-M. Wu and D.-K. Seo, J. Am. Chem. Soc. 126, 4398 (2004).
"Metathetical Conversion of Nd2O3 Nanoparticles into NdS2 Polysulfide Nanoparticles at Low Temperatures Using Boron Sulfides," L.-M. Wu, R. Sharma and D.-K. Seo, Inorg. Chem. 42, 5798 (2003).
"Synthesis, structure, and bonding of BaTl3: an unusual competition between cluster and classical bonding in the thallium layers," D.-K. Seo and J.D. Corbett, J. Am. Chem. Soc. 124, 415 (2002).
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