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J. C. Scott

Other affiliations: Cornell University
Bio: J. C. Scott is an academic researcher from IBM. The author has contributed to research in topics: Photorefractive effect & Polypyrrole. The author has an hindex of 13, co-authored 22 publications receiving 1795 citations. Previous affiliations of J. C. Scott include Cornell University.

Papers
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Journal ArticleDOI
TL;DR: The observation of the photorefractive effect in an amorphous electro-optic material, the nonlinear polymer bisphenol A diglycidyl ether 4-nitro-1,2,phenylenediamine (bisA-NPDA) make photoconductive by doping with the hole transport agent diethylaminobenzaldehyde-diphenyl hydrazone.
Abstract: We report the first observation of the photorefractive effect in a polymeric material, the electro-optic polymer bisphenol-A-diglycidylether 4-nitro-1,2-phenylenediamine made photoconductive by doping with the hole-transport agent diethylamino-benzaldehyde diphenylhydrazone. The gratings formed exhibit dynamic writing and erasure, strong electric-field dependence, polarization anisotropy, and estimated space-charge fields up to 26 kV/cm at an applied field of 126 kV/cm. Application of similar concepts should provide a broad new class of easily fabricated photorefractive materials.

572 citations

Journal ArticleDOI
G.B. Street1, T. C. Clarke1, M. Krounbi1, K. Keiji Kanazawa1, Victor Y. Lee1, P. Pfluger1, J. C. Scott1, G. Weiser1 
TL;DR: In this article, optical spectroscopy studies of both the electrochemically oxidized and the neutral polymer suggest the presence of highly mobile spins, consistent with the α,α' bonding in these polymers.
Abstract: Oxidized and neutral films of polypyrrole have been prepared electrochemically in the absence of oxygen and water. The neutral films are insulating and can be readily oxidized by chemical oxidizing agents to give films of greater conductivity than can be achieved by electrochemical oxidation. Optical spectroscopy provides evidence for the similarity of the polymeric carbonium ion produced by both types of oxidation. NMR studies are consistent with the α,α’ bonding in these polymers; they also show the expected downfield shifts relative to the neutral polymer on both chemical and electrochemical oxidation. ESR studies of both the electrochemically oxidized and the neutral polymer suggest the presence of highly mobile spins.

390 citations

Journal ArticleDOI
TL;DR: In this article, the kinetics of polaron recombination into bipolarons in polypyrrole has been studied by optical-absorption spectroscopy on films doped in situ in an electrochemical cell.
Abstract: The kinetics of polaron recombination into bipolarons in polypyrrole has been studied by optical-absorption spectroscopy on films doped in situ in an electrochemical cell ESR studies confirm that the metastable states possess spin, while the stable states do not The data reveal a slow evolution, consistent with polaron-diffusion rates limited by the mobility of the accompanying counterion

150 citations

Journal ArticleDOI
J. C. Scott1, Jean-Luc Brédas1, K. Yakushi1, P. Pfluger1, G.B. Street1 
TL;DR: In this paper, experimental data and theoretocal studies support the hypothesis that bipolarons are the charge carriers responsible for the conductivity of polypyrrole, and a consistent model emerges from consideration of earlier transport, ESR, photoelectron spectroscopy and optical absorption results.

125 citations

Journal ArticleDOI
TL;DR: The results show that the surface magnetic layer behaves as a separate entity from the bulk, and the in-plane component of surface magnetization aligns ferromagnetically to the bulk.
Abstract: The surface magnetism of Gd(0001) films is studied using spin resolved electron spectroscopies. Both a canted surface magnetization vector out of the plane of the film and an enhanced surface magnetic ordering temperature 60[plus minus]2 K higher than the bulk Curie temperature are observed. Our results show that the surface magnetic layer behaves as a separate entity from the bulk. The in-plane component of surface magnetization aligns ferromagnetically to the bulk. Spin resolved photoemission from the Gd 4[ital f] core levels shows [approx]65% spin polarization at 150 K, which extrapolates to [approx]91% at 0 K.

110 citations


Cited by
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Journal ArticleDOI
28 Aug 1997-Nature
TL;DR: The ability of nonlinear optical materials to transmit, process and store information forms the basis of emerging optoelectronic and photonic technologies as discussed by the authors, where organic chromophore-containing polymers, in which the refractive index can be controlled by light or an electric field, are expected to play an important role.
Abstract: The ability of nonlinear optical materials to transmit, process and store information forms the basis of emerging optoelectronic and photonic technologies. Organic chromophore-containing polymers, in which the refractive index can be controlled by light or an electric field, are expected to play an important role.

974 citations

Journal ArticleDOI
TL;DR: In this article, the recent progress of studies on photo-and electroactive amorphous molecular materials, highlighting photochromic amorphus molecular materials and their use in organic EL devices is discussed.
Abstract: A new field of organic materials science that deals with amorphous molecular glasses has been opened up. In addition, amorphous molecular materials have constituted a new class of functional organic materials for use in various applications. This article is focused on the recent progress of studies on photo- and electroactive amorphous molecular materials, highlighting photochromic amorphous molecular materials, amorphous molecular resists, and amorphous molecular materials for use in devices such as organic EL devices. The molecular design concepts, syntheses, reactions, molecular and solid-state properties, functions, and device fabrication and performance are described.

883 citations

Journal ArticleDOI
David F. Eaton1
19 Jul 1991-Science
TL;DR: Property and important materials constants of current commercial materials and of new, promising, inorganic and organic molecular and polymeric materials with potential in second- and third-order nonlinear optical applications are presented.
Abstract: The current state of materials development in nonlinear optics is summarized, and the promise of these materials is critically evaluated. Properties and important materials constants of current commercial materials and of new, promising, inorganic and organic molecular and polymeric materials with potential in second- and third-order nonlinear optical applications are presented.

839 citations