Advanced Functional Materials

Cover image for Advanced Functional Materials

February, 2004

Volume 14, Issue 2

Pages 103–190

    1. Alizarin Complexone on Nanocrystalline TiO2: A Heterogeneous Approach to Anion Sensing (pages 111–115)

      E. Palomares, R. Vilar, A. Green and J. R. Durrant

      Version of Record online: 11 FEB 2004 | DOI: 10.1002/adfm.200304444

      Alizarin complexone adsorbed onto a nanocrystalline, mesoporous TiO2 film has been demonstrated to be a solid-state ‘naked-eye’ colorimetric and spectrophotometric anion sensor (see Figure and front cover). The pH buffer action intrinsic to the TiO2 film allows dip sensing in aqueous medium without external pH buffering. This sensing system demonstrates high selectivity to F and CN anions, high sensitivity, a rapid response time, and good reusability.

    2. Spatially Selective Nucleation of Metal Clusters on the Tobacco Mosaic Virus (pages 116–124)

      M. Knez, M. Sumser, A. M. Bittner, C. Wege, H. Jeske, T. P. Martin and K. Kern

      Version of Record online: 11 FEB 2004 | DOI: 10.1002/adfm.200304376

      Tubular viruses can be used as chemically functionalized templates for binding metal ions such as PdII. Electroless deposition of nickel results in wire-like clusters inside the 4 nm wide interior channel. When PdII or PtII bind to the virus in the presence of phosphate, the deposition of nickel or cobalt becomes selective to the exterior surface. The false-color electron micrograph shows two linearly arranged tobacco mosaic viruses (green), with nickel clusters in the interior channel (red).

    3. Mask-free Localized Grafting of Organic Polymers at the Micrometer or Submicrometer Scale on Composite Conductors or Semiconductor Substrates (pages 125–132)

      J. Charlier, S. Ameur, J. P. Bourgoin, C. Bureau and S. Palacin

      Version of Record online: 11 FEB 2004 | DOI: 10.1002/adfm.200304311

      A one-step process enabling mask-free localized functionalization by organic polymers of conducting or semiconducting parts of composite surfaces at a micrometer scale is presented (see Figure). Functionalization is carried out via electrografting of precursors, guaranteeing the resolution of the pre-existing pattern. The mechanism's basis is the regioselective extraction of electrons from the surface according to local work function in solution.

    4. Properties of Carbon Nanotube Fibers Spun from DNA-Stabilized Dispersions (pages 133–138)

      J. N. Barisci, M. Tahhan, G. G. Wallace, S. Badaire, T. Vaugien, M. Maugey and P. Poulin

      Version of Record online: 11 FEB 2004 | DOI: 10.1002/adfm.200304500

      The fabrication of single-walled carbon nanotube fibers containing DNA has been demonstrated, with DNA adequately dispersing concentrations of carbon nanotubes up to 1 % by weight (see Figure). DNA-containing fibers are less conductive but significantly stronger than those based on surfactants, and increased conductivity was obtained by thermal annealing. Good electrochemical behavior and useful capacitance values were shown.

    5. Loading Fullerene into a Conjugated Polymer Without Chemical Modification (pages 139–144)

      K. Tada and M. Onoda

      Version of Record online: 11 FEB 2004 | DOI: 10.1002/adfm.200305058

      A novel way to load a large amount of unmodified fullerene into conjugated polymers is reported. Materials are quickly solidified from dilute solution into colloidal suspension, and collected by electrophoretic deposition. This procedure provides an alternative way to make nanocomposites when traditional solution-based techniques are not applicable due to poor component solubility.

    6. Conducting-Polymer Microcontainers: Controlled Syntheses and Potential Applications (pages 145–151)

      V. Bajpai, P. He and L. Dai

      Version of Record online: 11 FEB 2004 | DOI: 10.1002/adfm.200304489

      Electropolymerization of pyrrole around surfactant-stabilized H2 gas bubbles has been used to create conducting-polymer microcontainers on either patterned or non-patterned substrates. The resulting microcontainers prepared by the so-called “soap-bubble” template synthesis were demonstrated to have a wide range of potential applications, including sensors and controlled-release systems.

    7. Efficient and Photostable ZnS-Passivated CdS:Mn Luminescent Nanocrystals (pages 152–156)

      H. Yang and P. H. Holloway

      Version of Record online: 11 FEB 2004 | DOI: 10.1002/adfm.200305011

      ZnS-passivated CdS:Mn (CdS:Mn/ZnS core/shell) nanocrystals, which show efficient luminescence (see Figure) and photostability, have been synthesized using reverse micelle chemistry. Effective passivation of the CdS:Mn core surface by the ZnS shell was evident from the absence of surface-related defect emission and the high quantum efficiency. The nanocrystals also undergo photo-oxidation during UV irradiation in an air atmosphere.

    8. Selective Atmospheric Pressure Chemical Vapor Deposition Route to CdS Arrays, Nanowires, and Nanocombs (pages 157–162)

      J. P. Ge and Y. D. Li

      Version of Record online: 11 FEB 2004 | DOI: 10.1002/adfm.200305051

      CdS arrays (see Figure), nanowires, and nanocombs have been prepared via an atmospheric pressure chemical vapor deposition process. This synthetic route could also be applied to the synthesis of oriented nanowires of other metal sulfides. The photoluminescence properties of the samples were measured, since the CdS nanowire arrays are potential building blocks for electrically driven lasers and other optical nanodevices.

    9. Columnar Liquid Crystals with a Central Crown Ether Unit (pages 163–168)

      A. Schultz, S. Laschat, A. Saipa, F. Gießelmann, M. Nimtz, J. L. Schulte, A. Baro and B. Miehlich

      Version of Record online: 11 FEB 2004 | DOI: 10.1002/adfm.200304463

      The symmetric roof-shaped molecule that is shown on the right is one of several readily accessible molecules synthesized via a convergent Suzuki coupling reaction. It stacks into columns that form an unconventional columnar mesophase. The length of the alkyl chains (R) in the compounds influences their mesomorphic properties.

    10. On the Feasibility of Growing Pb[(Zn1/3Nb2/3)0.91Ti0.09]O3 Single Crystals (pages 169–173)

      B.-J. Fang, Y.-J. Shan, H.-Q. Xu, H.-S. Luo and Z.-W. Yin

      Version of Record online: 11 FEB 2004 | DOI: 10.1002/adfm.200304491

      Pb[(Zn1/3Nb2/3)0.91Ti0.09]O3 (PZNT91/9) single crystals were grown successfully direct from the melt (MC method) for the first time. Although PZNT91/9 crystals grown by the MC method and from solution using PbO as a self-fluxing agent (SC method) are of pure perovskite phase, their dielectric performances exhibit astonishing differences. The MC PZNT91/9 crystal also exhibits excellent piezoelectric properties, with a piezoelectric constant d33 in the range of ∼ 1800–2200 pC N–1, which is comparable to that of the SC crystal.

    11. Build-up of Polypeptide Multilayer Coatings with Anti-Inflammatory Properties Based on the Embedding of Piroxicam–Cyclodextrin Complexes (pages 174–182)

      N. Benkirane-Jessel, P. Schwinté, P. Falvey, R. Darcy, Y. Haïkel, P. Schaaf, J.-C. Voegel and J. Ogier

      Version of Record online: 11 FEB 2004 | DOI: 10.1002/adfm.200304413

      Biomaterial coatings based on polypeptide multilayers possessing anti-inflammatory properties are build-up from poly-(L-lysine) and poly-(L-glutamic) acid, the polypeptides, and piroxicam (Px), the anti-inflammatory agent. In order to embed high enough amounts of Px, the drug is incorporated in the films in the form of complexes with a charged 6A-carboxymethylthio-β-cyclodextrin. It is shown that these films present anti-inflammatory properties, which can be delayed, and whose duration can be tuned by changing the film architecture.

    12. A Simple and Effective Route for the Synthesis of Crystalline Silver Nanorods and Nanowires (pages 183–189)

      J.-Q. Hu, Q. Chen, Z.-X. Xie, G.-B. Han, R.-H. Wang, B. Ren, Y. Zhang, Z.-L. Yang and Z.-Q. Tian

      Version of Record online: 11 FEB 2004 | DOI: 10.1002/adfm.200304421

      A template-less and non-seed process for the aqueous-phase synthesis of crystalline silver nanorods (see Figure) and nanowires is demonstrated. The rod and wire diameters and aspect ratios can be manipulated by controlling the Na3C6H5O7 concentration. The silver nanocrystals are shown to be have a twinned crystalline structure. These nanomaterials are expected to enable preparation to be scaled up and applied to many fields.