Advanced Functional Materials

Cover image for Vol. 18 Issue 11

June 11, 2008

Volume 18, Issue 11

Pages 1605–1708

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Full Papers
    5. Corrections
    6. Index
    1. Cover Picture: Adv. Funct. Mater. 11/2008

      Article first published online: 12 JUN 2008 | DOI: 10.1002/adfm.200890040

      Thumbnail image of graphical abstract

      Gratings with switchable diffraction efficiency are produced by soft molding of polymer substrates that contain photochromic molecules. The switching is attributed to the variation in the dimensions of the gratings that result from photoinduced isomerization of the photochromic molecules. UV irradiation results in a decrease in the size of the striped domains, which leads to an increase in diffraction efficiency. Further irradiation with visible light leads to the recovery of the original domain widths and, therefore, the diffraction efficiency decreases to a value close to those measured initially.

  2. Contents

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Full Papers
    5. Corrections
    6. Index
    1. Contents: Adv. Funct. Mater. 11/2008 (pages 1605–1608)

      Article first published online: 12 JUN 2008 | DOI: 10.1002/adfm.200890041

  3. Full Papers

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Full Papers
    5. Corrections
    6. Index
    1. Networked Gold-Nanoparticle Coatings on Polyethylene: Charge Transport and Strain Sensitivity (pages 1611–1616)

      Tobias Vossmeyer, Carsten Stolte, Michael Ijeh, Andreas Kornowski and Horst Weller

      Article first published online: 3 JUN 2008 | DOI: 10.1002/adfm.200701509

      Thumbnail image of graphical abstract

      Flexible polyethylene substrates are coated with networked gold nanoparticles via layer-by-layer deposition. The strain-sensitive charge transport combined with the mechanical robustness of the coatings (see figure) establishes a base for their potential application as resistive strain sensors.

    2. Reversible Diffraction Efficiency of Photochromic Polymer Gratings Related to Photoinduced Dimensional Changes (pages 1617–1623)

      Despina Fragouli, Luana Persano, Giovanni Paladini, Dario Pisignano, Riccardo Carzino, Francesca Pignatelli, Roberto Cingolani and Athanassia Athanassiou

      Article first published online: 21 MAY 2008 | DOI: 10.1002/adfm.200701255

      Thumbnail image of graphical abstract

      Relative diffraction efficiency changes of an imprinted grating, which consists of polyethylmethacrylate-co-methylacrylate polymer doped with 10 wt% of spiropyran, following cycles of UV and visible laser light irradiation are measured (see figure). After UV irradiation the stripes reduce in size, resulting in an increase of the diffraction efficiency. Consequent irradiation with visible light causes the recovery of the stripes' width and thus of the diffraction efficiency, which returns close to the initial values.

    3. Evaluation of Encoded Layer-By-Layer Coated Microparticles As Protease Sensors (pages 1624–1631)

      Barbara G. Stubbe, Kevin Gevaert, Stefaan Derveaux, Kevin Braeckmans, Bruno G. De Geest, Marc Goethals, Joel Vandekerckhove, Joseph Demeester and Stefaan C. De Smedt

      Article first published online: 3 JUN 2008 | DOI: 10.1002/adfm.200701356

      Thumbnail image of graphical abstract

      Layer-by-layer (LbL) polyelectrolyte coatings, containing a red-labeled trypsin substrate, are carefully designed and applied at the surface of encoded microparticles. The peptide-loaded LbL coatings lose their red fluorescence upon incubation in a trypsin solution, indicating that LbL-coated microparticles show potential to screen for the presence of active proteases in biological samples (see figure).

    4. Manifestation of a Chiral Smectic C Phase in Diphenylbutadiene-Cored Bolaamphiphilic Sugars (pages 1632–1640)

      Suresh Das, Narayan Gopinathan, Shibu Abraham, Narayanaswamy Jayaraman, Madan K. Singh, S. Krishna Prasad and D. S. Shankar Rao

      Article first published online: 12 JUN 2008 | DOI: 10.1002/adfm.200701181

      Thumbnail image of graphical abstract

      The synthesis and characterization of liquid crystalline properties of a series of diphenylbutadiene-cored bolaamphiphilic sugars exhibiting macroscopic chirality, a phenomenon generally not observed for sugar-based amphiphiles is reported. The self-aggregation of the diphenylbutadiene core is shown to be critical for the formation of the chiral phase.

    5. One-Step Solvent-Free Synthesis and Characterization of Zn1−xMnxSe@C Nanorods and Nanowires (pages 1641–1653)

      Sayan Bhattacharyya, Ilana Perelshtein, Ofer Moshe, Daniel H. Rich and Aharon Gedanken

      Article first published online: 20 MAY 2008 | DOI: 10.1002/adfm.200700653

      Thumbnail image of graphical abstract

      Mn-doped ZnSe nanocrystals (nanorods/nanowires) encapsulated with carbon are reported. Manganese is efficiently doped inside the ZnSe lattice up to a 10.1% (Mn/Zn) atomic ratio. The nanorods/nanowires aspect ratio varies with Mn concentration (upper and lower SEM images show Mn/Zn ratios of 1:20 and 1:10, respectively). Carbon encapsulation reduces the toxicity and renders the nanocrystals suitable for biological applications.

    6. Polydisperse Aggregates of ZnO Nanocrystallites: A Method for Energy-Conversion-Efficiency Enhancement in Dye-Sensitized Solar Cells (pages 1654–1660)

      Qifeng Zhang, Tammy P. Chou, Bryan Russo, Samson A. Jenekhe and Guozhong Cao

      Article first published online: 20 MAY 2008 | DOI: 10.1002/adfm.200701073

      Thumbnail image of graphical abstract

      ZnO films consisting of polydisperse aggregates can serve as a photoelectrode for increasing the conversion efficiency of a dye-sensitized solar cell (see figure). The enhancement is attributed to light scattering generated by submicrometer-sized aggregates, resulting in extended travelling distance of light within the photoelectrode film.

    7. Shape control of new FexO–Fe3O4and Fe1–yMnyO–Fe3–zMnzO4 nanostructures (pages 1661–1667)

      Cristina Hofmann, Irene Rusakova, Teyeb Ould-Ely, Darío Prieto-Centurión, Keith B. Hartman, Anna T. Kelly, Andreas Lüttge and Kenton H. Whitmire

      Article first published online: 21 MAY 2008 | DOI: 10.1002/adfm.200701119

      Thumbnail image of graphical abstract

      New shapes of FexO-Fe3O4 (wüstite-magnetite) and Fe1-yMnyO-Fe3-zMnzO4 nanoparticles were obtained by decomposition of the corresponding metal carboxylates in an amine/carboxylic acid surfactant system. (see figure) The nanoparticles' shape was controlled by varying reaction parameters. The nanoparticles exhibit internal nanostructures which support a growth mechanism on which negatively curved rough crystal faces are etched away. These nanoparticles were successfully oxidized to the corresponding magnetic oxides without losing their original shape.

    8. Enhanced Hole-Transporting Behavior of Discotic Liquid-Crystalline Physical Gels (pages 1668–1675)

      Yuki Hirai, Hirosato Monobe, Norihiro Mizoshita, Masaya Moriyama, Kenji Hanabusa, Yo Shimizu and Takashi Kato

      Article first published online: 20 MAY 2008 | DOI: 10.1002/adfm.200701313

      Thumbnail image of graphical abstract

      Discotic liquid-crystalline physical gels (see figure) that exhibit enhanced hole-transporting behavior are prepared by a molecular self-organizing process of semiconducting triphenylene derivatives and a hydrogen-bonded gelator derived from L-valine. The construction of self-organized LC composites with well-controlled microphase-separated structures is a promising approach to the preparation of highly functional organic materials.

    9. Embedding Ag Nanoparticles into MgF2 Nanorod Arrays (pages 1676–1684)

      Yuping He, Zhongyue Zhang, Chris Hoffmann and Yiping Zhao

      Article first published online: 20 MAY 2008 | DOI: 10.1002/adfm.200800065

      Thumbnail image of graphical abstract

      Using a unique glancing angle co-deposition technique, face-centered cubic Ag nanoparticles have been embedded into aligned polycrystalline MgF2 nanorods with different topological shapes, such as tilted, zigzag, vertical, and helical nanorods. The demonstration reveals the combination of co-deposition and glancing angle deposition provides a unique way to design novel nanocomposite materials and doped nanorod arrays.

    10. Incorporation of Functionalized Palladium Nanoparticles within Ultrathin Nafion Films: A Nanostructured Composite for Electrolytic and Redox-Mediated Hydrogen Evolution (pages 1685–1693)

      Fei Li, Paolo Bertoncello, Ilenia Ciani, Giuseppe Mantovani and Patrick R. Unwin

      Article first published online: 20 MAY 2008 | DOI: 10.1002/adfm.200701447

      Thumbnail image of graphical abstract

      A novel ultrathin Nafion-palladium (Pd) nanocomposite film has been developed by incorporating positively charged Pd nanoparticles, stabilized with dimethylaminopyridine (DMAP), into Nafion Langmuir-Schaefer (LS) films. The films showed considerable activity for the redox-catalyzed hydrogen evolution reaction, the rate of which scaled with film thickness.

    11. Optically Active Spherical Polyelectrolyte Brushes with a Nanocrystalline Magnetic Core (pages 1694–1706)

      Aristides Bakandritsos, Nikos Bouropoulos, Radek Zboril, Kostas Iliopoulos, Nikos Boukos, George Chatzikyriakos and Stelios Couris

      Article first published online: 3 JUN 2008 | DOI: 10.1002/adfm.200701335

      Thumbnail image of graphical abstract

      Spherical polyelectrolyte hybrid brushes are prepared after in-situ covalent grafting of sulfonated polystyrene to growing magnetic γ-Fe2O3 nanocrystallites. The physicochemical properties of the polymeric sheath combine with those of the inorganic core, leading to nanostructures with magnetic and non linear optical properties. High colloid stability, permanent surface charge, and bioadhesive properties add to the value of the hybrid.

  4. Corrections

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Full Papers
    5. Corrections
    6. Index
    1. You have free access to this content
      Optical Nanoscale Pool-on-Surface Design for Control Sensing Recognition of Multiple Cations

      Sherif A. El-Safty, Adel A. Ismail, Hideyuki Matsunaga, Takaaki Hanaoka and Fujio Mizukami

      Article first published online: 12 JUN 2008 | DOI: 10.1002/adfm.200890043

    2. You have free access to this content
      Selective Determination of Dopamine on a Boron-Doped Diamond Electrode Modified with Gold Nanoparticle Polyelectrolyte-coated Polystyrene Colloids

      Min Wei, Li-Guo Sun, Zhuo-Ying Xie, Jin-Fang Zhi, Akira Fujishima, Yasuaki Einaga, De-Gang Fu, Xue-Mei Wang and Zhong-Ze Gu

      Article first published online: 12 JUN 2008 | DOI: 10.1002/adfm.200890044

  5. Index

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

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