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Advanced Functional Materials

Cover image for Vol. 11 Issue 1

February, 2001

Volume 11, Issue 1

Pages 13–74

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      Manuscripts in an Material World (page 13)

      P. Gregory

      Version of Record online: 14 FEB 2001 | DOI: 10.1002/1616-3028(200102)11:1<13::AID-ADFM13>3.0.CO;2-M

      What can you expect to find in this and future issues of Advanced Functional Materials? This and other questions, such as: “what is the difference between Advanced Functional Materials and its sister journal Advanced Materials?”, are addressed by Peter Gregory, Editor of the two journals.

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      Plastic Solar Cells (pages 15–26)

      C. J. Brabec, N. S. Sariciftci and J. C. Hummelen

      Version of Record online: 14 FEB 2001 | DOI: 10.1002/1616-3028(200102)11:1<15::AID-ADFM15>3.0.CO;2-A

      Recent developments in conjugated-polymer-based photovoltaic elements are reviewed here and an introduction to the underlying photophysics is given. Examples of photovoltaic architectures are presented and their potential in terrestrial solar energy conversion is discussed. The Figure shows a large-area plastic solar cell running a small motor. (See also inside front cover.)

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      The Little Maghemite Story: A Classic Functional Material (pages 27–29)

      R. Dronskowski

      Version of Record online: 14 FEB 2001 | DOI: 10.1002/1616-3028(200102)11:1<27::AID-ADFM27>3.0.CO;2-X

      Data storage is an integral part of today’s society and is something that we tend to take for granted. In this article, the history of one of the most important magnetic information storage materials—maghemite—is presented from a unique perspective. As the story of this material unfolds, insight into the generally accepted scientific principles at different periods of time is gained as the major breakthroughs in the understanding of this material and magnetism in general are described.

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      Patterning of Oriented Photofunctional Polymer Systems Through Selective Photobleaching (pages 31–35)

      C. Kocher, A. Montali, P. Smith and C. Weder

      Version of Record online: 14 FEB 2001 | DOI: 10.1002/1616-3028(200102)11:1<31::AID-ADFM31>3.0.CO;2-U

      Selective photobleaching—a spatially resolved change of the chemical structure of an active species by irradiation through an appropriate mask—is shown to be an extremely simple and versatile technique for the patterning of semiconducting conjugated polymers. The Figure, a portrait of Hermann Staudinger, demonstrates that high-information-content structures of high resolution can be easily obtained.

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      A Novel Photoscissile Poly(ethylene glycol)-Based Hydrogel (pages 37–40)

      Y. Zheng, F. M. Andreopoulos, M. Micic, Q. Huo, S. M. Pham and R. M. Leblanc

      Version of Record online: 14 FEB 2001 | DOI: 10.1002/1616-3028(200102)11:1<37::AID-ADFM37>3.0.CO;2-V

      A novel poly(ethylene glycol)-based hydrogel, which may have biomedical applications, is reported to have been produced by the photocrosslinking of poly(ethylene glycol)-nitrocinnamate (PEG-NC) macromers (see Figure). The system exhibits photoscissile behavior, as evidenced by environmental scanning electron microscopy, and does not require potentially harmful initiators or catalysts.

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      Polymeric Light-Emitting Diodes Based on Poly(p-phenylene ethynylene), Poly(triphenyldiamine), and Spiroquinoxaline (pages 41–46)

      C. Schmitz, P. Pösch, M. Thelakkat, H.-W. Schmidt, A. Montali, K. Feldman, P. Smith and C. Weder

      Version of Record online: 14 FEB 2001 | DOI: 10.1002/1616-3028(200102)11:1<41::AID-ADFM41>3.0.CO;2-S

      Careful design of device composition and structure is shown here to lead to device improvement and optimization for polymeric light-emitting diodes based on alkoxy-substituted poly(p-phenylene ethynylene) and poly(triphenyldiamine). The influence of the electron-transporting/hole-blocking material spiroquinoxaline (see Figure) is investigated using a combinatorial approach.

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      Polymeric Alkoxy PBD [2-(4-Biphenylyl)-5-Phenyl-1,3,4-Oxadiazole] for Light-Emitting Diodes (pages 47–50)

      C. Wang, M. Kilitziraki, L.-O. Pålsson, M. R. Bryce, A. P. Monkman and I. D. W. Samuel

      Version of Record online: 14 FEB 2001 | DOI: 10.1002/1616-3028(200102)11:1<47::AID-ADFM47>3.0.CO;2-T

      1,3,4-Oxadiazoles are known for their high photoluminescence efficiencies, and they have previously been used to significantly enhance electroluminescence efficiencies. Here is reported the synthesis of a polymeric [2-(4-biphenylyl)-5-phenyl-1,3,4-oxadiazole] (see Figure) via a Suzuki coupling reaction. Device studies show that the polymer acts as an efficient electron transport material.

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      Electronic Properties of the Interfaces Between the Wide Bandgap Organic Semiconductor Para-Sexiphenyl and Samarium (pages 51–58)

      N. Koch, E. Zojer, A. Rajagopal, J. Ghjisen, R. L. Johnson, G. Leising and J.-J. Pireaux

      Version of Record online: 14 FEB 2001 | DOI: 10.1002/1616-3028(200102)11:1<51::AID-ADFM51>3.0.CO;2-Q

      Understanding the interaction between organic molecules and metals is crucial for improving the performance of organic-based devices. Here the energy level alignment at the interface between para-sexiphenyl (6P) and Sm is investigated using ultraviolet photoelectron spectroscopy. The Figure shows 6P molecules and deposited Sm (dots) on a Si substrate.

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      Electroactive Mesoporous Yttria Stabilized Zirconia Containing Platinum or Nickel Oxide Nanoclusters: A New Class of Solid Oxide Fuel Cell Electrode Materials (pages 59–63)

      M. Mamak, N. Coombs and G. A. Ozin

      Version of Record online: 14 FEB 2001 | DOI: 10.1002/1616-3028(200102)11:1<59::AID-ADFM59>3.0.CO;2-F

      Improved-performance solid oxide fuel cell electrodes are the goal of the work presented by these authors. The materials explored consist of mesoporous yttria stabilized zirconia (YSZ) containing nanoclusters of either platinum or nickel oxide. Solid-state electrochemistry studies reveal interesting oxygen ion and electron charge-transport properties, which are attributed to the unique association of mesoporosity and nanocrystallinity at the microstructural level in these materials (see also cover).

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      Micro-Raman Scattering Imaging of Langmuir–Blodgett Surface Relief Gratings (pages 65–68)

      C. J. L. Constantino, R. F. Aroca, C. R. Mendonça, S. V. Mello, D. T. Balogh, S. C. Zilio and O. N. de Oliveira, Jr.

      Version of Record online: 14 FEB 2001 | DOI: 10.1002/1616-3028(200102)11:1<65::AID-ADFM65>3.0.CO;2-0

      Visualization of a surface relief grating (SRG) recorded on a Langmuir–Blodgett (LB) azopolymer film using Raman imaging is reported for the first time (3D image shown in Figure). Information on the chemical nature of the SRG formation is provided by micro-Raman imaging, and surface-enhanced Raman scattering experiments are used to probe the SRG surface.

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      Titanium-Doped Molybdenum Disulfide Nanostructures (pages 69–74)

      W. K. Hsu, Y. Q. Zhu, N. Yao, S. Firth, R. J. H. Clark, H. W. Kroto and D. R. M. Walton

      Version of Record online: 14 FEB 2001 | DOI: 10.1002/1616-3028(200102)11:1<69::AID-ADFM69>3.0.CO;2-D

      MoS2 nanotubes doped with Ti, produced by pyrolyzing a H2S/N2 mixture over an oxidized Ti–Mo alloy powder, are investigated here. The nanotubes are characterized by high-resolution TEM, X-ray diffraction, and Raman spectroscopy (the Figure shows the Raman-active modes of 2H–MoS2) and the effect of Ti incorporation is investigated.

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