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Arthur J. Epstein, received a B.S. in Physics (cum laude) from the Polytechnic Institute of Brooklyn in 1966. He then received an M.S. in Physics in 1967 and a Ph.D. in Physics in 1971, both from the University of Pennsylvania. He was a member of the technical staff at The MITRE Corp. from 1971 to 1972 and Principal Scientist at Xerox Webster Research Center from 1972 to 1985. Professor Epstein joined the faculty of The Ohio State University in 1985. He was appointed Director of the OSU Center for Materials Research in 1989, and Distinguished University Professor in 1997. In 2000 Professor Epstein assumed the post of Editor-in-Chief of the Journal of Synthetic Metals. Since arriving at Ohio State Professor Epstein has mentored more then 30 students to completion of their Ph.D. degrees.
Conducting, Semiconducting and Magnetic Polymers, and Molecule-based Materials
Professor Epstein's research efforts center on the development of an understanding of semiconducting, metallic, and magnetic polymer-and molecule-based materials. These relatively new fields of "synthetic metals" and "organic-based magnets" are highly interdisciplinary, requiring close interaction between chemists and physicists. The synergism between synthesis and modification of new materials and the study of their physical properties provide insight into their electronic and magnetic phenomena, and develop the criteria so that new systems may be designed with specific properties. Areas under study include using light to control magnetism (photoinduced magnetism), using electric fields to control conductivity (field-effect transistor) and using the "spin" component of electrons to control charge flow. His research spans from synthesis to processing to physical studies (our emphasis), to device studies. Currently semiconducting light emitting polymers such as polypyridine, and ferromagnetic molecular electron transfer salts such as (decamethylferrocenium) (tetracyanoethanide), and V(TCNE)x-y(CH2Cl2). Dr. Epstein's characterization laboratories include a broad range of spectroscopic, magnetic, and transport techniques. Optical absorption (50cm-1 to 50,000 cm-1) and time resolved photoinduced optical absorption (10-11 sec to 103 sec) give insight into electronic structure and stable excitations of materials of interest. Faraday, SQUID and AC susceptibility and EPR enable study of the spin interactions while a variety of computer interfaced temperature dependent transport techniques (including dc and ac to 1010 Hz) conductivity, thermopower, magneto transport, etc.) are employed to determine the mechanisms by which electrons move in the novel materials. Together these techniques provide insight into the structure-property relationships and the relevant roles of chemical composition and structure, as well as into electronic phenomena such as solitons, polarons, excitons, and magnetism.
A.J. Epstein, New Phenomena and Opportunities in Molecule-based Magnets, Materials Research Society Bulletin 25 (11), 33-40 (2000).
K.I. Pokhodnya, A.J. Epstein, and J.S. Miller, Thin-Film V[TCNE]x Magnets, Advanced Materials 12, 410-413 (2000).
Y.Z. Wang and A.J. Epstein, Interface Control of Light-emitting Devices Based on Pyridine-containing Conjugated Polymers, Accounts of Chemical Research 32, 217-224 (1999).
F.C. Delucia, Jr., T.L. Gustafson, Y.Z. Wang, D.K. Wang, and A.J. Epstein, Exciplex Dynamics in Electronic Polymer Blends and Bilayers, Physical ReviewB, in press (2002).
X. Zhan, Y. Liu, G. Yu, X. Wu, D. Zhu, R.G. Sun, D.K. Wang, and A.J. Epstein, Synthesis and Electroluminescence of Poly(aryleneethynylene)s Based on Fluorene Containing Hole-Transport Units, Journal of Materials Chemistry 11, 1606-1611 (2001).
D.M. Tigelaar, W.P. Lee, K.A. Bates, A. Saprigin, V.N. Prigodin, X. Cao, L.A.Nafie, M.S. Platz, and A.J. Epstein, Role of Solvent and Secondary Doping in Polyaniline Films Doped with Chiral Camphorsulfonic Acid: Preparation of a Chiral Metal, Chemistry of Materials 14, 1430-1438 (2002).
D.A. Pejakovic, C. Kitamura, J.S. Miller, and A.J. Epstein, Photoinduced Magnetization in the Organic-Based MagnetMn(TCNE)x-y(CH2Cl2), Physical ReviewLetters 88, 0572021-0572024 (2002).
W.-P. Lee, K.R. Brenneman, C.-H Hsu, H. Shih, and A.J. Epstein, Charge Transport Properties of High-Strength, High-Modulus Sulfonated Polyaniline/Poly(p-Phenylene Terephthalamide) Fibers, Macromolecules 34, 2648-2652 (2001).