General research interests are molecular design, synthesis, modification, and self-assembly of smart polymers for biomedical and optoelectronic applications, including Biomaterials, Molecular Biosensors, Smart Gels, Optoelectronic Polymers, Conjugated Polymers, Block Copolymers, Organic-inorganic Hybrid Materials, Photovoltaic Cells, and Self-assembly. Currently we are studying the following areas:
Biosensors: Sensitivity and selectivity are the most important parameters of a sensor. Nature provides high fidelity in biosynthesis. The unique combination of this specificity of the bio-system and the tunable properties of synthetic polymers would be a promising direction toward molecular sensors with high selectivity and sensitivity. We are developing molecular biosensors and bio-microarrays through bio-/synthetic hybrid systems for clinically important biological materials.
Photovoltaic Cells: Much effort has been made to convert abundant solar energy into useful electricity. The solar cells made of inorganic semiconductors require stringent manufacturing processes and high cost that are not suitable for large area application. Conjugated polymer (CP)-based solar cells are attractive alternatives due to easy processibility and the tunable optoelectronic properties. Hybrid composites of conjugated block copolymers and inorganic nanoparticles having hierarchical nano-ordering are currently under investigation by means of new materials development and nanoimprinting.
Organic Phosphors: Recently we developed a molecular design principle to realize pure organic phosphor having high emission quantum yield even at room temperature with oxygen presence. By rationally designing directed heavy atom effects through intermolecular halogen bonding in crystalline aromatic carbonyl compounds we achieved highly efficient triplet generation and suppression of vibration dissipation. Controlling electron density of such organic phosphorescent materials we could active active color tuning as well. We are developing a second generation of organic phosphors to apply them to device applications.
Barito, A, Sykes, M, Bilby, D, Amonoo, J, Jin, Y, Morris, S, Green, P, Kim, J, and Shtein, M (2013). Recovering Lost Exciton in Organic Photovoltaics using a Transparent Dissociation Layer, Journal of Applied Physics, 113:203110.
Kang, HU, Yu, YC, Shin, SJ, Kim, J, and Youk, JH (2013). One-pot Synthesis of Poly(N-vinyl pyrrolidone)-b-poly(epsilon-caprolactone) Block Copolymers Using a Dual Initiator for RAFT Polymerization and ROP, Macromolecules, 46(4):1291-1295.
Kim, B, Chung, K, and Kim, J (2013). Molecular Design Principle of All-organic Dyes for Dye-sensitized Solar Cell, Chemistry - A European Journal, 19:5220-5230.
Kim, B, Jeong, EJ, Chung, JW, Seo, S, Koo, B, and Kim, J (2013). A molecular design principle of lyotropic liquid-crystalline conjugated polymers with directed alignment capability for plastic electronics, Nature Materials, online published.
Kim, B, Ma, X, Chen, C, Ie, Y, Coir, EW, Hashemi, H, Aso, Y, Green, PF, Kieffer, J, and Kim, J (2013). Energy Level Modulation and Prediction in Conjugated Polymers for Organic Photovoltaic Application, Advanced Functional Materials, 23:439-445.
Lee, D, Bolton, O, Kim, BC, Youk, JH, Takayama, S, and Kim, J (2013). Room Temperature Phosphorescence of Metal-free Organic Materials in Amorphous Polymer Matrices, Journal of the American Chemical Society, 135:6325-6329.
Lee, K, Mandal, S, Morry, J, Srivannavit, O, Gulari, E, and Kim, J (2013). Conjugated Polymer-Peptide Hybrid System for Prostate-Specific Antigen (PSA) Detection, Chemical Communications, 49:4528-4530.
Povlich, LK, Cho, JC, Leach, MK, Corey, JM, Kim, J, and Martin, DC (2013). Synthesis, copolymerization and peptide-modification of carboxylic acid-functionalized 3.4-ethylenedioxythiophene for neural electrode interfaces, Biochimica et Biophysica Acta.
Seo, S, Lee, J, Choi, E, Song, JY, and Kim, J (2013). Polydiacetylene Liposome Microarray toward Influenza A Virus Detection: Effect of Target Size on Turn-on Signaling, Macromolecular Rapid Communication, 34:743-748
Kang, DH, Jung, H, Ahn, N, Lee, J, Seo, S, Suh, K, Kim*, J, and Kim*, K (2012). Biomimetic Detection of Aminoglycosidic Antibiotics using Polydiacetylene-phospholipids Supramolecules, Chemical Communications, 48:5313-5315.
Kang, DH, Jung, H, Lee, J, Seo, S, Kim, J, Kim, K, and Suh, KY (2012). Design of polydiacetylene-phospholipid supramolecules for enhanced stability and sensitivity, Langmuir, 28(19):7551-7556.
Kim, B, Jeong, EJ, Kwon, KH, Yoo, Y, Choi, D, and Kim, J (2012). Controlling Mold Releasing Propensity -The Role of Surface Energy and of a Multiple Chain Transfer Agent, ACS Applied Materials & Interfaces, 4:3465-3470.
Kim, B, Zhen, C, Jeong, EJ, Kieffer, J, and Kim, J (2012). Organic Dye Design Tools for Efficient Photo-Current Generation in Dye Sensitized Solar Cells and Exciton Binding Energy and Electron Acceptor, Advanced Functional Materials, 22:1606-1612. (link)
Lee, J and Kim, J (2012). Multiphasic Sensory Alginate Particle having Polydiacetylene Liposome for Selective and More Sensitive Multi Targeting Detection, Chemistry of Materials, 24:2817-2822.
Lee, J, Seo, S, and Kim, J (2012). Colorimetric Detection of Warfare Gases by Polydiacetylenes toward Equipment-free detection, Advanced Functional Materials, 22:1632-1638.
Lee, K, Kim, H, and Kim, J (2012). Design Principle of Conjugated Polyelectrolytes to Make Them Water-Soluble and Highly Emissive, Advanced Functional Materials, 22:1076-1086.
Lee, K, Lee, J, Jeong, EJ, Kronk, A, Elenitoba-Johnson, K, Lim, MS, and Kim, J (2012). Conjugated Polyelectrolyte-Antibody Hybrid Molecules for Live Cell Imaging, Advanced Materials, 24:2479-2484.
Nidetz, R and Kim, J (2012). Directed Self-Assembly of Nanogold using a Chemically Modified Nanopatterned Surface, Nanotechnology, 23:045602.