Advanced Functional Materials

Cover image for Vol. 17 Issue 9

June, 2007

Volume 17, Issue 9

Pages 1435–1582

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Index
    1. Cover Picture: Assembly and Photoinduced Organization of Mono- and Oligopeptide Molecules Containing an Azobenzene Moiety (Adv. Funct. Mater. 9/2007)

      Y. Matsuzawa, K. Ueki, M. Yoshida, N. Tamaoki, T. Nakamura, H. Sakai and M. Abe

      Version of Record online: 1 JUN 2007 | DOI: 10.1002/adfm.200790030

      A molecular system capable of organizing and dispersing upon exposure to different wavelengths of light is prepared by using an azobenzene derivative having three valyl moieties (see figure and cover). N-(L-valyl-L-valyl-L-valyl)azobenzene-4-carboxamide forms a β-sheet structure in this artificial assembly. Upon photoirradiation, the azobenzene moieties isomerize completely, and the reversibility of the structural organization through the flexibility of the β-sheet network is revealed.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Index
    1. Inside Front Cover: Environmental Optical Sensitivity of Gold Nanodecahedra (Adv. Funct. Mater. 9/2007)

      I. Pastoriza–Santos, A. Sánchez–Iglesias, F. J. García de Abajo and L. M. Liz–Marzán

      Version of Record online: 1 JUN 2007 | DOI: 10.1002/adfm.200790031

      The sensitivity of localized surface plasmon resonances with respect to changes in the refractive index of the surrounding medium is measured for regular gold nanodecahedra (see figure and inside cover), and compared to rigorous solutions of Maxwell's equations for bicones based upon the boundary element method. Excellent agreement between experimental and calculated spectra is found.

  3. Contents

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

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Index
    1. Environmental Optical Sensitivity of Gold Nanodecahedra (pages 1443–1450)

      I. Pastoriza–Santos, A. Sánchez–Iglesias, F. J. García de Abajo and L. M. Liz–Marzán

      Version of Record online: 28 MAR 2007 | DOI: 10.1002/adfm.200601071

      Thumbnail image of graphical abstract

      The sensitivity of localized surface plasmon resonances with respect to changes in the refractive index of the surrounding medium is measured for regular gold nanodecahedra (see figure and inside cover), and compared to rigorous solutions of Maxwell's equations for bicones based upon the boundary element method. Excellent agreement between experimental and calculated spectra is found.

    2. Surface-Engineered Nanocontainers for Entrapment of Corrosion Inhibitors (pages 1451–1458)

      D. G. Shchukin and H. Möhwald

      Version of Record online: 27 APR 2007 | DOI: 10.1002/adfm.200601226

      Thumbnail image of graphical abstract

      Nanocontainers with surfaces modified with polyelectrolyte shells (see figure) are fabricated using a layer-by-layer method and are tested at various pHs for the release of benzotriazole. When immediate release is necessary, SiO2-based or halloysite-based nanocontainers with a shell of weak polyelectrolytes are preferable. When continuous, gradual release is required, halloysite-based nanocontainers with a shell of one weak and one or two strong polyelectrolytes are preferable.

    3. A Facile Synthesis and Characterization of Monodisperse Spherical Pigment Particles with a Core/Shell Structure (pages 1459–1465)

      C. Lin, Y. Li, M. Yu, P. Yang and J. Lin

      Version of Record online: 28 MAR 2007 | DOI: 10.1002/adfm.200600775

      Thumbnail image of graphical abstract

      Monodisperse, spherical, nonaggregated pigment particles with a core/shell structure are produced using a facile sol–gel process. Spherical silica particles and Cr2O3, α-Fe2O3, ZnCo2O4, CuFeCrO4, MgFe2O4, and CoAl2O4 pigments are used as cores and shells, respectively (see figure). The pigment particles have better dispersing properties than commercial products.

    4. AgI/Ag Heterojunction Nanowires: Facile Electrochemical Synthesis, Photoluminescence, and Enhanced Ionic Conductivity (pages 1466–1472)

      C. Liang, K. Terabe, T. Tsuruoka, M. Osada, T. Hasegawa and M. Aono

      Version of Record online: 20 APR 2007 | DOI: 10.1002/adfm.200600590

      Thumbnail image of graphical abstract

      A versatile, template-confined, step-electrochemical growth technique is used in the facile fabrication of AgI/Ag heterojunction nanowires with ionic conductivity properties. Photoluminescence, Raman scattering, and ionic conductivity measurements reveal the structural evolution and interface-/defect-related migration of Ag+ ions.

    5. Antibody-Functionalized Hybrid Superparamagnetic Nanoparticles (pages 1473–1479)

      M. Arruebo, R. Fernández-Pacheco, B. Velasco, C. Marquina, J. Arbiol, S. Irusta, M. R. Ibarra and J. Santamaría

      Version of Record online: 30 APR 2007 | DOI: 10.1002/adfm.200600560

      Thumbnail image of graphical abstract

      Superparamagnetic hybrid nanoparticles are obtained; they consist of an inner iron oxide core coated by a silica shell (see figure) and are covalently coupled to a monoclonal antibody (anti-hCG). This has been verified by an immunochromatographic assay. These results point to the potential of the hybrid nanoparticles prepared for use as enhanced contrast agents in magnetic resonance imaging applications.

    6. A Poly(3,4-alkylenedioxythiophene) Electrochromic Variable Optical Attenuator with Near-Infrared Reflectivity Tuned Independently of the Visible Region (pages 1480–1486)

      A. L. Dyer, C. R. G. Grenier and J. R. Reynolds

      Version of Record online: 27 APR 2007 | DOI: 10.1002/adfm.200601145

      Thumbnail image of graphical abstract

      A variable optical attenuator is demonstrated that allows large optical contrasts in the near-IR with little color change in the visible region at low applied potentials. The attenuator consists of a flexible reflective display containing a dioxythiophene polymer film spray-cast from solution. The figure shows a schematic of the device and the attenuation for near-IR and visible light.

    7. Carbon Electrodes Modified with TiO2/Metal Nanoparticles and Their Application for the Detection of Trinitrotoluene (pages 1487–1492)

      B. Filanovsky, B. Markovsky, T. Bourenko, N. Perkas, R. Persky, A. Gedanken and D. Aurbach

      Version of Record online: 18 APR 2007 | DOI: 10.1002/adfm.200600714

      Thumbnail image of graphical abstract

      The unexpected and pronounced electrochemical activity of carbon- paper electrodes modified with TiO2/nano-Pt composites for the reduction of trinitrotoluene (TNT) (see figure) leads to a completely new avenue for the manufacture of sensors for this explosive. In this electrochemical process, trinitroso-toluene and hydroxylamine derivatives are formed, which react with the ethylene glycol and ethanol of the background solution.

    8. Microphase-Separated Donor–Acceptor Diblock Copolymers: Influence of HOMO Energy Levels and Morphology on Polymer Solar Cells (pages 1493–1500)

      M. Sommer, S. M. Lindner and M. Thelakkat

      Version of Record online: 18 APR 2007 | DOI: 10.1002/adfm.200600634

      Thumbnail image of graphical abstract

      A series of novel semiconducting donor–acceptor block copolymers that contain substituted triphenylamines as donors and perylene diimide as the acceptor (see figure) are synthesized by means of nitroxide-mediated polymerization, and the influence of morphology and the highest occupied molecular orbital (HOMO) level of the donor on block-copolymer solar-cell characteristics is studied.

    9. Synthesis and Lasing Properties of Highly Ordered CdS Nanowire Arrays (pages 1501–1506)

      B. L. Cao, Y. Jiang, C. Wang, W. H. Wang, L. Z. Wang, M. Niu, W. J. Zhang, Y. Q. Li and S. T. Lee

      Version of Record online: 20 APR 2007 | DOI: 10.1002/adfm.200601179

      Thumbnail image of graphical abstract

      Large-area uniform arrays of single-crystalline CdS nanowires are obtained by a simple solution approach on Cd-foil substrates. The well-aligned nanowire arrays serve as laser cavities and exhibit bandgap lasing in the visible region, paving the way for applications in novel nano-optoelectronic devices. The figure displays room-temperature PL spectra showing bandgap emission from a CdS nanowire array excited by a Nd:YAG laser at various excitation power densities.

    10. Assembly and Photoinduced Organization of Mono- and Oligopeptide Molecules Containing an Azobenzene Moiety (pages 1507–1514)

      Y. Matsuzawa, K. Ueki, M. Yoshida, N. Tamaoki, T. Nakamura, H. Sakai and M. Abe

      Version of Record online: 20 APR 2007 | DOI: 10.1002/adfm.200700052

      Thumbnail image of graphical abstract

      A molecular system capable of organizing and dispersing upon exposure to different wavelengths of light is prepared by using an azobenzene derivative having three valyl moieties (see figure and cover). N-(L-valyl-L- valyl-L-valyl)azobenzene-4-carboxamide forms a β-sheet structure in this artificial assembly. Upon photoirradiation, the azobenzene moieties isomerize completely, and the reversibility of the structural organization through the flexibility of the β-sheet network is revealed.

    11. Fabrication and Characterization of Polymer/Liquid Crystal Composite Diffractive Optics by Multiphoton Methods (pages 1515–1522)

      A. Xie, T. Ito and D. A. Higgins

      Version of Record online: 24 APR 2007 | DOI: 10.1002/adfm.200600575

      Thumbnail image of graphical abstract

      Switchable polymer/liquid crystal composite diffraction gratings (see figure) are prepared by multiphoton- induced photolithography. They are subsequently characterized by static and dynamic polarization-dependent multiphoton excited fluorescence microscopy. The data show that liquid-crystal orientation and field-induced reorientation dynamics are influenced by nanometer-scale polymer surface roughness.

    12. [Fe3(HCOO)6]: A Permanent Porous Diamond Framework Displaying H2/N2 Adsorption, Guest Inclusion, and Guest-Dependent Magnetism (pages 1523–1536)

      Z.-M. Wang, Y.-J. Zhang, T. Liu, M. Kurmoo and S. Gao

      Version of Record online: 24 APR 2007 | DOI: 10.1002/adfm.200600676

      Thumbnail image of graphical abstract

      Both polar and nonpolar guests of different sizes can be included in the novel porous magnet [Fe3(HCOO)6], which is the iron member of the [M3(HCOO)6] family (where M = Mn, Fe, Co, Ni, etc.). The compound can be prepared by using a mild solution- chemistry method and it displays permanent porosity and thermal stability, significant H2 and N2 adsorption, and guest-modulated 3D long-range magnetic ordering (see figure).

    13. Platinum Nanoparticle Clusters Immobilized on Multiwalled Carbon Nanotubes: Electrodeposition and Enhanced Electrocatalytic Activity for Methanol Oxidation (pages 1537–1541)

      Y. Zhao, L. Fan, H. Zhong, Y. Li and S. Yang

      Version of Record online: 24 APR 2007 | DOI: 10.1002/adfm.200600416

      Thumbnail image of graphical abstract

      3D flowerlike platinum nanoparticle clusters (see figure) are electrodeposited onto multiwalled carbon nanotubes by using an all-electrochemical three-step protocol, involving a second step of a potential pulse sequence. The 3D fractal morphology thus produced provides significantly higher electrocatalytic activity and better stability for the oxidation of methanol than the 2D uniform nanoparticle dispersion achieved when using cyclic voltammetry as the second step.

    14. Large-Scale Synthesis, Annealing, Purification, and Magnetic Properties of Crystalline Helical Carbon Nanotubes with Symmetrical Structures (pages 1542–1550)

      N. J. Tang, W. Zhong, C. T. Au, A. Gedanken, Y. Yang and Y. W. Du

      Version of Record online: 10 MAY 2007 | DOI: 10.1002/adfm.200600767

      Thumbnail image of graphical abstract

      Crystalline helical carbon nanotubes are synthesized selectively in large quantities by the pyrolysis of acetylene over iron nanoparticles. The resulting hollow nanotubes (see figure) are most commonly observed as symmetric pairs of helical structures with opposite helicities emanating from a carbon- encapsulated Fe3C nanoparticle. The magnetic properties of these nanostructures are systematically studied, and they are also found to be excellent microwave absorbers.

    15. Diphenylamine-Substituted Cruciform Oligo(phenylene vinylene): Enhanced One- and Two-Photon Excited Fluorescence in the Solid State (pages 1551–1557)

      F. He, L. L. Tian, X. Y. Tian, H. Xu, Y. H. Wang, W. J. Xie, M. Hanif, J. L. Xia, F. Z. Shen, B. Yang, F. Li, Y. G. Ma, Y. Q. Yang and J. C. Shen

      Version of Record online: 27 APR 2007 | DOI: 10.1002/adfm.200600518

      Thumbnail image of graphical abstract

      A novel cruciform oligo(phenylene vinylene) chromophore has been designed and emits green–blue light with high photoluminescence (PL) efficiency both in solution and in the solid state, as shown in the figure. The cruciform shape impedes crystallization and allows amorphous films of the molecule to be produced by spin-coating. The high PL efficiency, strong two-photon-excited fluorescence, and good film-forming abilities make this molecule a promising candidate for use in solid-state optical devices.

    16. Controlling the Growth and Assembly of Silver Nanoprisms (pages 1558–1566)

      J. H. Zhang, H. Y. Liu, P. Zhan, Z. L. Wang and N. B. Ming

      Version of Record online: 20 APR 2007 | DOI: 10.1002/adfm.200600727

      Thumbnail image of graphical abstract

      A three-component system consisting of water, polyvinylpyrrolidone (PVP), and n-pentanol is shown to be an excellent initiator for the formation of Ag nanoprisms (see figure). The size and shape of these particles can be tuned by the respective amounts of water and PVP present. Using this simple one-step synthesis Ag nanoprism assemblies, Au and Pd nanoprisms, lamellar ZnO particles, and layered ZnO assemblies can also be prepared.

    17. Organic Light-Emitting Transistors Containing a Laterally Arranged Heterojunction (pages 1567–1573)

      C. A. Di, G. Yu, Y. Q. Liu, X. J. Xu, D. C. Wei, Y. B. Song, Y. M. Sun, Y. Wang and D. B. Zhu

      Version of Record online: 20 APR 2007 | DOI: 10.1002/adfm.200601140

      Thumbnail image of graphical abstract

      Visible light from an organic light-emitting transistor (OLET) under ambient conditions is achieved by the device structure presented here, which includes a heterojunction between the laterally arranged source and drain electrodes (see figure). The fabrication of such devices is simple and generally applicable, and as such, may be at the base of many light-emitting transistor applications.

    18. The Synergistic Effect of Prussian-Blue-Grafted Carbon Nanotube/Poly(4-vinylpyridine) Composites for Amperometric Sensing (pages 1574–1580)

      J. Li, J.-D. Qiu, J.-J. Xu, H.-Y. Chen and X.-H. Xia

      Version of Record online: 28 MAR 2007 | DOI: 10.1002/adfm.200600033

      Thumbnail image of graphical abstract

      Composite films, prepared by casting multiwalled carbon nanotubes (MWCNTs) wrapped with poly(4-vinylpyridine) (PVP) onto gold electrodes followed by electrochemical deposition of Prussian blue on the MWCNT/PVP matrix, show prominent electrocatalytic activity toward the reduction of hydrogen peroxide. Amperometric sensor manufactured from these films show them to be promising for the sensitive and fast detection of glucose (see figure).

  5. Index

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

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