Advanced Functional Materials

Cover image for Vol. 17 Issue 12

August, 2007

Volume 17, Issue 12

Pages 1865–1992

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Full Papers
    5. Index
    1. Cover Picture: Low-Work-Function Surface Formed by Solution-Processed and Thermally Deposited Nanoscale Layers of Cesium Carbonate (Adv. Funct. Mater. 12/2007)

      J. Huang, Z. Xu and Y. Yang

      Version of Record online: 7 AUG 2007 | DOI: 10.1002/adfm.200790041

      Thumbnail image of graphical abstract

      The deposition of a thin film of cesium carbonate between Al or Ag cathodes and the light-emitting polymer enhances the performance of polymer light-emitting diodes by facilitating electron injection from the cathode to the organic semiconductor. The figure shows the band structure at the interface. The lowered electron-injection barrier is attributed to the formation of an Al–O–Cs complex at the interface with the cathode.

  2. Contents

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Full Papers
    5. Index
  3. Full Papers

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Full Papers
    5. Index
    1. Synthesis of Hierarchically Porous Carbon Monoliths with Highly Ordered Microstructure and Their Application in Rechargeable Lithium Batteries with High-Rate Capability (pages 1873–1878)

      Y.-S. Hu, P. Adelhelm, B. M. Smarsly, S. Hore, M. Antonietti and J. Maier

      Version of Record online: 12 JUL 2007 | DOI: 10.1002/adfm.200601152

      Thumbnail image of graphical abstract

      Meso-/macroporous silica functions well as a template for hierarchically porous carbon monoliths with highly ordered microstructure. This porous carbon monolith with a mixed conducting hierarchical network shows superior high-rate performance when used as an anode material in electrochemical lithium cells (see figure).

    2. Textured Tubular Nanoparticle Structures: Precursor-Templated Synthesis of GaN Sub-micrometer Sized Tubes (pages 1879–1886)

      S. Ding, P. Lu, J.-G. Zheng, X. F. Yang, F. L. Zhao, J. Chen, H. Wu and M. M. Wu

      Version of Record online: 12 JUL 2007 | DOI: 10.1002/adfm.200700289

      Thumbnail image of graphical abstract

      Textured tubular nanostructures of wurtzite GaN are prepared from hydrothermally derived GaOOH rods via an in situ dehydration and nitridation approach, in which β-Ga2O3 is formed as an intermediated phase. Both cylindrical and prismatic tubes (see figure) with nanopores can be prepared. The high-temperature precursor-template approach offers the flexibility of fabricating semiconductor materials with desired hollow and textured nanostructures.

    3. The Quest for High-Performance Host Materials for Electrophosphorescent Blue Dopants (pages 1887–1895)

      M.-F. Wu, S.-J. Yeh, C.-T. Chen, H. Murayama, T. Tsuboi, W.-S. Li, I. Chao, S.-W. Liu and J.-K. Wang

      Version of Record online: 12 JUL 2007 | DOI: 10.1002/adfm.200600800

      Thumbnail image of graphical abstract

      Two structurally similar host materials for electrophosphorescent blue dopants, mCP and SimCP (see figure), are systematically compared. The triphenylsilyl group on SimCP does not significantly alter the energy levels but prevents the close-packing of the molecules in the condensed phase. In contrast, the mCP molecules tend to aggregate, as shown in the figure by the red-shifting of the emission features, adversely affecting the singlet and triplet energy levels of the material.

    4. Stable, Low-Temperature Discotic Nematic Superstructures by Incorporating a Laterally Substituted Sidearm in Hexakis(phenylethynyl)benzene Discogens (pages 1896–1902)

      S.-C. Chien, H.-H. Chen, H.-C. Chen, Y.-L. Yang, H.-F. Hsu, T.-L. Shih and J.-J. Lee

      Version of Record online: 12 JUL 2007 | DOI: 10.1002/adfm.200601019

      Thumbnail image of graphical abstract

      A new strategy for the design of superior nematic discogens is explored by introducing laterally substituted sidearms (see figure). This modification is designed to enhance interdisc interactions only partially on the periphery of the disc to achieve a superior discotic nematic range and to lower transition points. Concurrently, steric hindrance between discs is introduced to prevent the formation of columnar phases.

    5. Catalytic Performance of Nanoscale-Corrugated Gold and Silver Films for Surface-Enhanced Chemiluminescence (pages 1903–1909)

      M. G. Ou, G. W. Lu, H. Shen, A. Descamps, C. A. Marquette, L. J. Blum, G. Ledoux, S. Roux, O. Tillement, B. L. Cheng and P. Perriat

      Version of Record online: 12 JUL 2007 | DOI: 10.1002/adfm.200601174

      Thumbnail image of graphical abstract

      Luminol–H2O2 chemiluminescence is catalyzed by the presence of a corrugated metal surface (see figure). The work presented here shows that gold corrugated on a nanometer-scale is a better catalyst than nanoscale-corrugated silver for surface-enhanced chemiluminescence.

    6. Lipoplex-Loaded Microbubbles for Gene Delivery: A Trojan Horse Controlled by Ultrasound (pages 1910–1916)

      I. Lentacker, S. C. De Smedt, J. Demeester, V. Van Marck, M. Bracke and N. N. Sanders

      Version of Record online: 4 JUL 2007 | DOI: 10.1002/adfm.200700106

      Thumbnail image of graphical abstract

      Novel lipid-loaded microbubbles (schematically depicted in the figure) that release intact lipoplexes upon exposure to therapeutic ultrasound are developed. Small perforations are generated in cell membranes upon the ultrasound-induced implosion of the microbubbles, which allows the attached lipoplexes to enter the cells. The concepts developed here may enable in vivo time- and space- controlled gene delivery.

    7. White Electroluminescence from a Single-Polymer System with Simultaneous Two-Color Emission: Polyfluorene Blue Host and Side-Chain-Located Orange Dopant (pages 1917–1925)

      J. Liu, X. Guo, L. J. Bu, Z. Y. Xie, Y. X. Cheng, Y. H. Geng, L. X. Wang, X. B. Jing and F. S. Wang

      Version of Record online: 29 JUN 2007 | DOI: 10.1002/adfm.200600988

      Thumbnail image of graphical abstract

      A dopant–host strategy involving the covalent attachment of an orange emissive dopant to the side chain of a blue emissive polymer host is used to develop a highly efficient white electroluminescent polymer (see figure) with simultaneous blue and orange emission. A maximum luminance efficiency of 10.6 cd A–1 with CIE coordinates of (0.30, 0.40) is achieved from a single-layer device.

    8. Sandwiched Ruthenium/Carbon Nanostructures for Highly Active Heterogeneous Hydrogenation (pages 1926–1931)

      F. Su, F. Y. Lee, L. Lv, J. Liu, X. N. Tian and X. S. Zhao

      Version of Record online: 29 JUN 2007 | DOI: 10.1002/adfm.200700067

      Thumbnail image of graphical abstract

      Ruthenium nanoparticles sandwiched in porous carbon (see figure) display a remarkably high activity and stability in benzene hydrogenation because of the intimate Ru/C contact, and the firm immobilization and uniform dispersion of Ru nanoparticles.

    9. Co3O4 Nanostructures with Different Morphologies and their Field-Emission Properties (pages 1932–1939)

      B. Varghese, C. H. Teo, Y. Zhu, M. V. Reddy, B. V. R. Chowdari, A. T. S. Wee, V. B. C. Tan, C. T. Lim and C.-H. Sow

      Version of Record online: 10 JUL 2007 | DOI: 10.1002/adfm.200700038

      Thumbnail image of graphical abstract

      Vertically aligned nanostructures of Co3O4 with various morphologies (the figure shows nanowires; nanowalls were also obtained) are made on cobalt foil in a controlled manner using a facile method. The morphological variations are achieved by varying the reactivity and diffusivity of the oxidizing species by creating a plasma environment in the system. The field-emission properties of the as-synthesized nanostructures are investigated.

    10. Naphthyl and Thionaphthyl End-Capped Oligothiophenes as Organic Semiconductors: Effect of Chain Length and End-Capping Groups (pages 1940–1951)

      H. K. Tian, J. W. Shi, B. He, N. H. Hu, S. Q. Dong, D. H. Yan, J. P. Zhang, Y. H. Geng and F. S. Wang

      Version of Record online: 6 JUL 2007 | DOI: 10.1002/adfm.200706198

      Thumbnail image of graphical abstract

      High-performance organic semiconductors have been prepared y end-capping oligothiophenes with naphthyl (NaTn) and thionaphthyl (TNTn) groups (see figure). Organic field-effect transistors fabricated from the NaTn compounds show a much superior performance than those fabricated from the TNTn compounds. Mobilities that are above 0.1 cm2 V–1 s–1 with high Ion/Ioff and low VT are achieved.

    11. Crystallization of Amorphous SiO2 Microtubes Catalyzed by Lithium (pages 1952–1957)

      L. Zhao, N. Li, A. Langner, M. Steinhart, T. Y. Tan, E. Pippel, H. Hofmeister, K.-N. Tu and U. Gösele

      Version of Record online: 10 JUL 2007 | DOI: 10.1002/adfm.200601104

      Thumbnail image of graphical abstract

      Crystalline silica microtubes consisting of single-crystalline segments (see figure) are obtained by using thermal oxidation coupled with lithium-induced crystallization of macroporous silicon. The Li was transported through the gas phase. This Li-induced crystallization of SiO2 allows the integration of quartz and cristobalite layers into microstructured Si building blocks.

    12. Layered Titanate Nanosheets Intercalated with Myoglobin for Direct Electrochemistry (pages 1958–1965)

      L. Zhang, Q. Zhang and J. Li

      Version of Record online: 12 JUL 2007 | DOI: 10.1002/adfm.200600991

      Thumbnail image of graphical abstract

      Layered titanate nanosheets (TNSs) as support matrixes for the immobilization of myoglobin (Mb) are used to fabricate a protein electrode to study the direct electron-transfer process between the redox center of the protein and the electrode (see figure). Such an electrode can also serve as an example of a mediator-free (the third generation) biosensor.

    13. Low-Work-Function Surface Formed by Solution-Processed and Thermally Deposited Nanoscale Layers of Cesium Carbonate (pages 1966–1973)

      J. Huang, Z. Xu and Y. Yang

      Version of Record online: 12 JUL 2007 | DOI: 10.1002/adfm.200700051

      Thumbnail image of graphical abstract

      The deposition of a thin film of cesium carbonate between Al or Ag cathodes and the light-emitting polymer enhances the performance of polymer light-emitting diodes by facilitating electron injection from the cathode to the organic semiconductor. The figure shows the band structure at the interface. The lowered electron-injection barrier is attributed to the formation of an Al–O–Cs complex at the interface with the cathode.

    14. W5O14 Nanowires (pages 1974–1978)

      M. Remškar, J. Kovac, M. Viršek, M. Mrak, A. Jesih and A. Seabaugh

      Version of Record online: 4 JUL 2007 | DOI: 10.1002/adfm.200601150

      Thumbnail image of graphical abstract

      Quasi-one-dimensional W5O14 nanowires (see figure) are grown using NiI2 as a growth promoter. Photoelectron spectroscopy and direct-transport measurements reveal metallic conductivity. The possible growth mechanism of this rarely synthesized phase is discussed based on scanning electron microscopy and transmission electron diffraction.

    15. Strong Carbon-Nanotube–Polymer Bonding by Microwave Irradiation (pages 1979–1983)

      C. Y. Wang, T. H. Chen, S. C. Chang, S. Y. Cheng and T. S. Chin

      Version of Record online: 4 JUL 2007 | DOI: 10.1002/adfm.200601011

      Thumbnail image of graphical abstract

      The heat released by carbon nanotubes upon microwave irradiation is used to locally melt polymer substrates, thus welding the nanotubes to the substrate. This process is advantageous since it can be carried out rapidly at room temperature without damaging the polymer, and is also generalizable to different types of polymers. The microwave-welding approach is used to weld together two polymeric substrates using carbon nanotubes as the adhesive.

    16. Template-Free Fabrication and Enhanced Photocatalytic Activity of Hierarchical Macro-/Mesoporous Titania (pages 1984–1990)

      J. G. Yu, Y. R. Su and B. Cheng

      Version of Record online: 12 JUL 2007 | DOI: 10.1002/adfm.200600933

      Thumbnail image of graphical abstract

      Hierarchical macro-/mesoporous titania (see figure) was prepared without the addition of templates or auxiliary additives at room temperature by the simple dropwise addition of tetrabutyl titanate to pure water. The calcined samples showed especially high thermal stability and photocatalytic activity, and could be used in photocatalysis, catalysis, solar-cell, separation, and purification processes.

  4. Index

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Full Papers
    5. Index

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