Advanced Functional Materials

Cover image for Vol. 19 Issue 4

February 24, 2009

Volume 19, Issue 4

Pages 503–664

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Feature Article
    6. Frontispiece
    7. Full Papers
    8. Index
    1. Neural Interface Biomaterials: Multifunctional Nanobiomaterials for Neural Interfaces (Adv. Funct. Mater. 4/2009)

      Mohammad Reza Abidian and David C. Martin

      Version of Record online: 19 FEB 2009 | DOI: 10.1002/adfm.200990009

      Thumbnail image of graphical abstract

      Neural electrodes are designed to interface with the nervous system and provide control signals for neural prostheses. However, robust and reliable chronic recording and stimulation remains a challenge for neural electrodes. On page 573, Mohammad Reza Abidian and David Martin report a novel method for the fabrication of soft, low impedance, high charge density, and controlled releasing nanobiomaterials that can be applied for neural interfaces using drug loaded nanofibers, 3D conducting polymer nanostructures (PEDOT), and alginate hydrogel.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Feature Article
    6. Frontispiece
    7. Full Papers
    8. Index
    1. Biological Templating: Bioinspired Design of SrAl2O4:Eu2+ Phosphor (Adv. Funct. Mater. 4/2009)

      Mariya H. Kostova, Cordt Zollfrank, Miroslaw Batentschuk, Friedlinde Goetz-Neunhoeffer, Albrecht Winnacker and Peter Greil

      Version of Record online: 19 FEB 2009 | DOI: 10.1002/adfm.200990010

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      The morphology of native pine wood is replicated to generate a novel cellular phosphor material based on Eu-doped strontium aluminate. On page 599, the authors describe the infiltration and conversion of the original cell wall pattern using the biotemplating technique. The obtained materials show a strong green photoluminescence. Biological templates offer a novel approach for designing advanced micropatterned phosphor materials.

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Feature Article
    6. Frontispiece
    7. Full Papers
    8. Index
  4. Feature Article

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Feature Article
    6. Frontispiece
    7. Full Papers
    8. Index
    1. Ordered Mesoporous Silica Derived from Layered Silicates (pages 511–527)

      Tatsuo Kimura and Kazuyuki Kuroda

      Version of Record online: 22 JAN 2009 | DOI: 10.1002/adfm.200800647

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      Mesophase silicates derived from layered silicates composed of single silicate sheets are useful as precursors for mesoporous silica with various orderings. This Feature Article comprehensively summarizes the formation mechanisms on the basis of the reactivity of the layered silicates with alkylammonium-type surfactants and the variation of the silicate sheets, including the possible formation of ordered mesoporous silica with a crystalline framework.

  5. Frontispiece

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Feature Article
    6. Frontispiece
    7. Full Papers
    8. Index
    1. Optical Power Limiters: Symmetric Versus Unsymmetric Platinum(II) Bis(aryleneethynylene)s with Distinct Electronic Structures for Optical Power Limiting/Optical Transparency Trade-off Optimization (Adv. Mater. 8/2009)

      Guijiang Zhou, Wai-Yeung Wong, Suk-Yue Poon, Cheng Ye and Zhenyang Lin

      Version of Record online: 19 FEB 2009 | DOI: 10.1002/adfm.200990012

      Thumbnail image of graphical abstract

      The development of symmetric and unsymmetric platinum(II) bis(acetylide)s as highly transparent optical limiters is described by Wong and co-workers on page 531. Their excited state character is governed by electronic structure, which significantly affects their photophysical properties and optical power limiting (OPL) behavior. The sound OPL responses and low OPL thresholds together with their excellent optical transparency render these materials very promising candidates for practical devices for the protection of human eyes and other delicate electro-optic sensors.

  6. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Feature Article
    6. Frontispiece
    7. Full Papers
    8. Index
    1. Symmetric Versus Unsymmetric Platinum(II) Bis(aryleneethynylene)s with Distinct Electronic Structures for Optical Power Limiting/Optical Transparency Trade-off Optimization (pages 531–544)

      Guijiang Zhou, Wai-Yeung Wong, Suk-Yue Poon, Cheng Ye and Zhenyang Lin

      Version of Record online: 18 DEC 2008 | DOI: 10.1002/adfm.200800856

      Thumbnail image of graphical abstract

      Symmetric versus unsymmetric Pt(II) bis(acetylide)s (see figure) are developed as highly transparent optical limiters. Their excited state character is correlated to the electronic structure which significantly affects their photophysical properties and optical power limiting (OPL) behavior. Their sound OPL responses and low OPL thresholds together with their excellent optical transparency renders these metalated molecular materials as very promising candidates for practical devices.

    2. Synthesis of Nanohole-Structured Single-Crystalline Platinum Nanosheets Using Surfactant-Liquid-Crystals and their Electrochemical Characterization (pages 545–553)

      Tsuyoshi Kijima, Yu Nagatomo, Hirokatsu Takemoto, Masafumi Uota, Daisuke Fujikawa, Yuzo Sekiya, Teppei Kishishita, Makoto Shimoda, Takumi Yoshimura, Hideya Kawasaki and Go Sakai

      Version of Record online: 15 JAN 2009 | DOI: 10.1002/adfm.200800966

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      Nanohole-structured platinum nanosheets with nanoholes of ∼1.8 nm wide are synthesized by the borohydride reduction of Pt salts in the lyotropic liquid crystals of polyoxyethylene (20) sorbitan monooleate (Tween 80) mixed with or without nonaethyleneglycol monododecylether (C12EO9) to demonstrate a fairly high performance as an electrocatalyst for oxygen reduction reaction or a cathode material for polymer electrolyte fuel cells.

    3. Microgel-Based Stimuli-Responsive Capsules (pages 554–559)

      Sebastian Berger, Haiping Zhang and Andrij Pich

      Version of Record online: 22 JAN 2009 | DOI: 10.1002/adfm.200801203

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      Novel multi-sensitive capsules are prepared by the integration of microgels into the capsule wall. The aqueous microgels act as stabilizers for oil-in-water emulsion and become organized on the surface of chloroform droplets containing biodegradable polymer. Solvent evaporation leads to the formation of capsules with microgels integrated into the capsule wall. Microgels acting as stimuli-sensitive blocks ensure capsule response to changes in temperature or solvent composition.

    4. Multifunctional Deep-Blue Emitter Comprising an Anthracene Core and Terminal Triphenylphosphine Oxide Groups (pages 560–566)

      Chen-Han Chien, Ching-Kun Chen, Fang-Ming Hsu, Ching-Fong Shu, Pi-Tai Chou and Chin-Hung Lai

      Version of Record online: 12 JAN 2009 | DOI: 10.1002/adfm.200801240

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      A blue-light-emitting material POAn, which contains a 2-tert-butyl-anthracene core functionalized with two triphenylphos phine oxide units, exhibits excellent electroluminescence (EL) performance when incorporated into a simple double-layer EL device possessing high-work-function Al as the cathode. The EL efficiency reaches as high as 4.3% (2.9 cd A−1), together with a satisfying blue emission (CIE coordinates: (0.15,0.07)).

    5. Tuning and Enhancing Photoluminescence of Light-Emitting Polymer Nanotubes through Electron-Beam Irradiation (pages 567–572)

      Young Ki Hong, Dong Hyuk Park, Soung Kyu Park, Hugeun Song, Dae-Chul Kim, Jeongyong Kim, Young Hwan Han, Ok Kyung Park, Byung Cheol Lee and Jinsoo Joo

      Version of Record online: 14 JAN 2009 | DOI: 10.1002/adfm.200801088

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      A new method for tuning and enhancing photoluminescence characteristics of light emitting poly (3-methylthiopnehe) (P3MT) nanotubes through electron (E)-beam irradiation under atmospheric environments is reported. From laser confocal microscope photoluminescence (PL) experiments, significant enhancements in PL intensity are observed. The luminescent color of the P3MT nanotubes changed from green to red depending on the variation of E-beam dosage, originated from the de-doping effect and the conformational modification through E-beam irradiation.

    6. Multifunctional Nanobiomaterials for Neural Interfaces (pages 573–585)

      Mohammad Reza Abidian and David C. Martin

      Version of Record online: 29 JAN 2009 | DOI: 10.1002/adfm.200801473

      Thumbnail image of graphical abstract

      Multifunctional and hybrid nanostructured materials for neural interfaces that are soft, have low impedance, high charge capacity density, and are capable of controlled drug release are designed. The fabrication process includes electrospinning of anti-inflammatory drug-incorporated biodegradable nanofibers, encapsulation of these nanofibers by an alginate hydrogel layer, then electrochemical polymerization of conducting polymers around the electrospun drug-loaded nanofibers to form nanotubes and within the alginate hydrogel scaffold to form cloud-like nanostructures.

    7. Exploiting a Dual-Fluorescence Process in Fluorene–Dibenzothiophene-S,S-dioxideCo-Polymers to Give Efficient Single Polymer LEDs with Broadened Emission (pages 586–591)

      Simon M. King, Irene I. Perepichka, Igor F. Perepichka, Fernando B. Dias, Martin R. Bryce and Andrew P. Monkman

      Version of Record online: 22 JAN 2009 | DOI: 10.1002/adfm.200801237

      Thumbnail image of graphical abstract

      Combined local exciton/charge-transfer emission from random 9,9-dioctylfluorene–dibenzothiophene-S,S-dioxide copolymers (i.e., dual fluorescence) is a viable approach to polymer light-emitting devices with broadened electroluminescence, utilizing solution processing fabrication routes.

    8. Fabrication and Electromechanical Characterization of a Piezoelectric Structural Fiber for Multifunctional Composites (pages 592–598)

      Yirong Lin and Henry A. Sodano

      Version of Record online: 14 JAN 2009 | DOI: 10.1002/adfm.200800859

      Thumbnail image of graphical abstract

      A SiC fiber core and a BaTiO3 piezoelectric shell are used to fabricate a multifunctional fiber. The electromechanical coupling of the fiber is characterized using atomic force microscopy for various aspect ratios, and compared to predictions made using finite element modeling. The results show good agreement with the model and the fibers could have coupling up to 68% of the active constituent.

    9. Bioinspired Design of SrAl2O4:Eu2+ Phosphor (pages 599–603)

      Mariya H. Kostova, Cordt Zollfrank, Miroslaw Batentschuk, Friedlinde Goetz-Neunhoeffer, Albrecht Winnacker and Peter Greil

      Version of Record online: 12 DEC 2008 | DOI: 10.1002/adfm.200800878

      Thumbnail image of graphical abstract

      Pine wood is converted into Eu-doped SrAl2O4 phosphor material pseudomorphous to the original cell wall pattern using a biotemplating technique. These biomorphous phosphor materials show a strong green emission. The bio-organic template anatomy together with optical functionality of Eu-doped SrAl2O4 may offer a novel approach for designing advanced micropatterned phosphor materials.

    10. Highly Efficient Quantum-Dot-Sensitized Solar Cell Based on Co-Sensitization of CdS/CdSe (pages 604–609)

      Yuh-Lang Lee and Yi-Siou Lo

      Version of Record online: 12 JAN 2009 | DOI: 10.1002/adfm.200800940

      Thumbnail image of graphical abstract

      CdS and CdSe quantum dots (QDs) are used as co-sensitizers of a nanocrystalline TiO2 photoelectrode. The cascade structure of this TiO2/CdS/CdSe electrode forms a stepwise structure of band-edge levels which is advantageous to the electron injection and hole recovery of the QDs. The performance of a QD-sensitized solar cell is greatly enhanced by the present structure.

    11. Heat-Transport Mechanisms in Superlattices (pages 610–615)

      Yee Kan Koh, Yu Cao, David G. Cahill and Debdeep Jena

      Version of Record online: 12 JAN 2009 | DOI: 10.1002/adfm.200800984

      Thumbnail image of graphical abstract

      Heat transport mechanisms in superlattices are identified from the thermal conductivity of (AlN)x–(GaN)y superlattices. For long-period superlattices, heat flow is controlled by the thermal conductance of the interfaces. From measurements on irradiated superlattices, it is demonstrated that long-wavelength phonons are the dominant heat carriers for short-period superlattices. Temperature dependence measurements indicate that only a small portion of these long-wavelength phonons form phonon minibands.

    12. Temperature-Sensitive Nanocapsules for Controlled Drug Release Caused by Magnetically Triggered Structural Disruption (pages 616–623)

      Ting-Yu Liu, Kun-Ho Liu, Dean-Mo Liu, San-Yuan Chen and I-Wei Chen

      Version of Record online: 12 JAN 2009 | DOI: 10.1002/adfm.200801304

      Thumbnail image of graphical abstract

      Nanocapsules containing magnetic iron oxide (brown precipitates) and a model drug (vitamin B12) encapsulated inside a cross-linked two-layered thermosensitive PEO-PPO-PEO shell abruptly shrink above the transition temperature (40.5 °C), which dramatically increases the drug release (compare two lower curves of figure); they also release the drug in a burst upon remote magnetic heating (upper curve of figure).

    13. Quantum-Chemical Characterization of the Origin of Dipole Formation at Molecular Organic/Organic Interfaces (pages 624–633)

      Igor Avilov, Victor Geskin and Jérôme Cornil

      Version of Record online: 12 JAN 2009 | DOI: 10.1002/adfm.200800632

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      The origin of the dipole formed at the interface between two organic materials is investigated by quantum-chemical methods. Model systems based on the TTF and TCNQ molecules are considered to disentangle the contributions of charge-transfer (CT) and polarization effects to the dipole formation at the interface. The conditions favoring partial versus integer charge transfer at the interfaces are also discussed.

    14. Influence of Point-Defect Reaction Kinetics on the Lattice Parameter of Ce0.8Gd0.2O1.9 (pages 634–641)

      Anna Kossoy, Yishai Feldman, Roman Korobko, Ellen Wachtel, Igor Lubomirsky and Joachim Maier

      Version of Record online: 12 JAN 2009 | DOI: 10.1002/adfm.200801162

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      The kinetics of point-defect association/dissociation in Ce0.8Gd0.2O1.9 and their influence on the crystal lattice parameter are investigated and found consistent with dissociation/association of oxygen vacancy–aliovalent dopant complexes. Annealing transforms buckled self-supported films into a flat state. Over the course of a few months, the films revert from the flat to the buckled state (see figure), indicating that formation of the dopant–vacancy complex is associated with a volume increase.

    15. Organized Nanostructured Complexes of Polyoxometalates and Surfactants that Exhibit Photoluminescence and Electrochromism (pages 642–652)

      Tierui Zhang, Shaoqin Liu, Dirk G. Kurth and Charl F. J. Faul

      Version of Record online: 23 JAN 2009 | DOI: 10.1002/adfm.200801409

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      Hybrid liquid-crystalline nanostructured materials from the polyoxometalate (POM), [EuP5W30O110]12−, and functional organic surfactants exhibit photoluminescence and reversible electrochromism. The voltammetric responses of the complexes are affected greatly by not only the type of surfactant but also the alkyl chain length.

    16. Ordered Mesoporous In2O3: Synthesis by Structure Replication and Application as a Methane Gas Sensor (pages 653–661)

      Thomas Waitz, Thorsten Wagner, Tilman Sauerwald, Claus-Dieter Kohl and Michael Tiemann

      Version of Record online: 12 JAN 2009 | DOI: 10.1002/adfm.200801458

      Thumbnail image of graphical abstract

      Mesoporous In2O3 gas sensors are synthesized by structure replication from SBA-15 and KIT-6 silica. The materials are thermally stable and can be prepared with variable pore size and pore wall thickness. They show a high sensitivity to methane gas in technologically relevant concentrations. The sensing performance is correlated not only with the surface-to-volume ratio, but also with the nanoscopic structural properties of the materials.

  7. Index

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Feature Article
    6. Frontispiece
    7. Full Papers
    8. Index

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