Advanced Functional Materials

Cover image for Vol. 17 Issue 6

April, 2007

Volume 17, Issue 6

Pages 847–1038

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Full Papers
    5. Index
    1. Cover Picture: Vapor Sorption and Electrical Response of Au-Nanoparticle– Dendrimer Composites (Adv. Funct. Mater. 6/2007)

      N. Krasteva, Y. Fogel, R. E. Bauer, K. Müllen, Y. Joseph, N. Matsuzawa, A. Yasuda and T. Vossmeyer

      Article first published online: 5 APR 2007 | DOI: 10.1002/adfm.200790020

      The vapor sensitivity of composite films comprising Au nanoparticles and polyphenylene dendrimers, shown schematically in the figure, is investigated. The responses measured with chemiresistors and mass-sensitive transducers are compared, and reveal a linear correlation between resistance increase and analyte uptake.

  2. Contents

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Full Papers
    5. Index
    1. Contents: Adv. Funct. Mater. 6/2007 (pages 847–855)

      Article first published online: 5 APR 2007 | DOI: 10.1002/adfm.200790019

  3. Full Papers

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Full Papers
    5. Index
    1. Photochemical Formation of Au/Cu Bimetallic Nanoparticles with Different Shapes and Sizes in a Poly(vinyl alcohol) Film (pages 857–862)

      M. Sakamoto, T. Tachikawa, M. Fujitsuka and T. Majima

      Article first published online: 1 FEB 2007 | DOI: 10.1002/adfm.200600700

      Thumbnail image of graphical abstract

      Bimetallic Au/Cu nanoparticles are synthesized in poly(vinyl alcohol) films by a photochemical process. As shown in the figure, the formed nanoparticles have different sizes and shapes, depending on whether they reside inside or outside the UV irradiation spot, resulting in the formation of a uniquely patterned nanocomposite thin film.

    2. Blue-Light-Emitting Oligoquinolines: Synthesis, Properties, and High-Efficiency Blue-Light-Emitting Diodes (pages 863–874)

      C. J. Tonzola, A. P. Kulkarni, A. P. Gifford, W. Kaminsky and S. A. Jenekhe

      Article first published online: 19 FEB 2007 | DOI: 10.1002/adfm.200600542

      Thumbnail image of graphical abstract

      High-efficiency blue organic light- emitting diodes (OLEDs) with excellent blue Commission Internationale de L'Eclairage (CIE) coordinates are demonstrated based on highly fluorescent n-type oligoquinolines as the emissive and electron-transport material (see figure). Simple bilayer OLEDs that have the highest efficiencies yet found (7.12 cd A–1, 6.56 % external quantum efficiency at 1175 cd m–2) for blue OLEDs with a neat fluorescent emitter are reported.

    3. Spectral encoding on Gold Nanorods Doped in a Silica Sol–Gel Matrix and Its Application to High-Density Optical Data Storage (pages 875–880)

      J. W. M. Chon, C. Bullen, P. Zijlstra and M. Gu

      Article first published online: 22 FEB 2007 | DOI: 10.1002/adfm.200600565

      Thumbnail image of graphical abstract

      Metallic nanorods exhibit two principle absorption bands corresponding to surface plasmon resonance (SPR) along the longitudinal and transverse directions of the nanorod. Importantly, the longitudinal band can be tuned with the rod's aspect ratio, making it a spectrally tuneable optical material (see figure). Here, spectral encoding is demonstrated on two sizes of gold nanorods doped in a silica sol–gel matrix by femtosecond pulsed laser irradiation.

    4. Vapor Sorption and Electrical Response of Au-Nanoparticle– Dendrimer Composites (pages 881–888)

      N. Krasteva, Y. Fogel, R. E. Bauer, K. Müllen, Y. Joseph, N. Matsuzawa, A. Yasuda and T. Vossmeyer

      Article first published online: 2 MAR 2007 | DOI: 10.1002/adfm.200600598

      Thumbnail image of graphical abstract

      The vapor sensitivity of composite films comprising Au nanoparticles and polyphenylene dendrimers, shown schematically in the figure, is investigated. The responses measured with chemiresistors and mass-sensitive transducers are compared, and reveal a linear correlation between resistance increase and analyte uptake.

    5. Copper/Polyimide Heterojunctions: Controlling Interfacial Structures Through an Additive-Based, All-Wet Chemical Process Using Ion-Doped Precursors (pages 889–897)

      S. Ikeda, H. Yanagimoto, K. Akamatsu and H. Nawafune

      Article first published online: 19 FEB 2007 | DOI: 10.1002/adfm.200600527

      Thumbnail image of graphical abstract

      Metallization of polyimide films by using an additive-based chemical method is presented. The interfacial microstructures formed after wet chemical reduction of doped copper ions (see figure) are found to play a critical role for adhesion between metal thin films and the polyimide substrate.

    6. Piezoresistive Behavior Study on Finger-Sensing Silicone Rubber/Graphite Nanosheet Nanocomposites (pages 898–904)

      L. Chen, G. H. Chen and L. Lu

      Article first published online: 29 JAN 2007 | DOI: 10.1002/adfm.200600519

      Thumbnail image of graphical abstract

      Finger-pressure sensors may be made from the nanocomposites presented here. The silicone rubber/graphite nanosheet composites with their volume content closest to that of the percolation threshold shows a remarkable positive piezoresistive effect at very low pressures (see figure) that renders them extremely useful as sensors in the finger-pressure range.

    7. Atomistic Study of a CaTiO3-Based Mixed Conductor: Defects, Nanoscale Clusters, and Oxide-Ion Migration (pages 905–912)

      G. C. Mather, M. S. Islam and F. M. Figueiredo

      Article first published online: 1 FEB 2007 | DOI: 10.1002/adfm.200600632

      Thumbnail image of graphical abstract

      Mixed oxide-ion and electronic conductivity can be exploited in dense ceramic membranes for controlled oxygen separation. Atomistic simulation (see figure) has been used to probe the energetics of defects, dopant-vacancy association, nanoscale cluster formation, and oxide-ion transport in mixed-conducting CaTiO3.

    8. Organically Doped Metals—A New Approach to Metal Catalysis: Enhanced Ag-Catalyzed Oxidation of Methanol (pages 913–918)

      G. E. Shter, H. Behar-Levy, V. Gelman, G. S. Grader and D. Avnir

      Article first published online: 9 FEB 2007 | DOI: 10.1002/adfm.200600482

      Thumbnail image of graphical abstract

      A new concept in catalytic materials is described: organically doped metals. Organically doped Ag greatly outperforms Ag as a catalyst for methanol oxidation to formaldehyde in terms of lowering the temperature needed for maximal conversion by 100 °C, and in lowering the temperature by 200 °C to reach the maximal selectivity (see figure).

    9. Microdroplet and Atomic Force Microscopy Probe Assisted Formation of Acidic Thin Layers for Silicon Nanostructuring (pages 919–926)

      X. N. Xie, H. J. Chung, C. H. Sow and A. T. S. Wee

      Article first published online: 19 FEB 2007 | DOI: 10.1002/adfm.200600439

      Thumbnail image of graphical abstract

      An aqueous acidic thin-layer-based strategy for fabricating oxide dots and silicon pores by AFM nanolithography is presented. This approach involves the formation of microscale droplets on silicon by dilute hydrofluoride (DHF) etching, the conversion of the droplets to acidic thin layers by AFM probe scanning, and subsequent anodic oxidation and dissolution by operating a biased probe in the acidic DHF thin layers (see figure).

    10. Phase Segregation in Thin Films of Conjugated Polyrotaxane– Poly(ethylene oxide) Blends: A Scanning Force Microscopy Study (pages 927–932)

      L. Sardone, C. C. Williams, H. L. Anderson, G. Marletta, F. Cacialli and P. Samorì

      Article first published online: 19 FEB 2007 | DOI: 10.1002/adfm.200600181

      Thumbnail image of graphical abstract

      The phase segregation at surfaces between poly(ethylene oxide) and conjugated polyrotaxanes is controlled through proper functionalization of the polyrotaxanes (see figure). This result is important for improving the performance of light-emitting diodes, and light-emitting electrochemical cells based on supramolecularly engineered organic polymers.

    11. Controlled Synthesis of Various Hollow Cu Nano/MicroStructures via a Novel Reduction Route (pages 933–938)

      Y. Liu, Y. Chu, Y. Zhuo, L. Dong, L. Li and M. Li

      Article first published online: 19 FEB 2007 | DOI: 10.1002/adfm.200600333

      Thumbnail image of graphical abstract

      Various hollow Cu nano/microstructures are prepared (see figure) through the reduction of CuSO4 · 5 H2O with glucose in the presence of NaOH by using a mild hydrothermal process. A series of experiments confirm that the concentration of the glucose and NaOH play important roles in the morphology of the products.

    12. A Raman Spectroscopy Study of Individual SiC Nanowires (pages 939–943)

      M. Bechelany, A. Brioude, D. Cornu, G. Ferro and P. Miele

      Article first published online: 22 FEB 2007 | DOI: 10.1002/adfm.200600816

      Thumbnail image of graphical abstract

      The free carrier concentration of a single 40 nm 3C-SiC nanowire is evaluated by using Raman spectroscopy. The correlation between Raman spectral profiles and structural deformations is probed on a nanowire attached to the apex of a tungsten tip that has been coated by a thin gold layer (see figure).

    13. Enantioselective Crystallization on Chiral Polymeric Microspheres (pages 944–950)

      D. D. Medina, J. Goldshtein, S. Margel and Y. Mastai

      Article first published online: 13 FEB 2007 | DOI: 10.1002/adfm.200600408

      Thumbnail image of graphical abstract

      A new approach for chiral resolution based on enantioselective crystallization on chiral polymeric microspheres is presented. Chiral microspheres are synthesized and their chiral discrimination ability is studied using the crystallization of DL-valine as a model system. The figure shows the enantioselective crystallization of valine in the microspheres (scale bar 5 μm). Optical rotation measurements show an enatiomeric excess of ca. 25 % in the chiral microspheres.

    14. Protein-Mediated Synthesis of Uniform Superparamagnetic Magnetite Nanocrystals (pages 951–957)

      T. Prozorov, S. K. Mallapragada, B. Narasimhan, L. Wang, P. Palo, M. Nilsen-Hamilton, T. J. Williams, D. A. Bazylinski, R. Prozorov and P. C. Canfield

      Article first published online: 26 JAN 2007 | DOI: 10.1002/adfm.200600448

      Thumbnail image of graphical abstract

      Shape-selective coprecipitation synthesis of ca. 30 nm uniform magnetite nanocrystals (see figure) is performed with an iron-binding biomineralization protein, Mms6. The effect of Mms6 mineralization protein in magnetite synthesis is compared to that of several other proteins and is found to provide a selective bioinspired route for the synthesis of superparamagnetic nanocrystals.

    15. Surface-Modified High-k Oxide Gate Dielectrics for Low-Voltage High-Performance Pentacene Thin-Film Transistors (pages 958–962)

      C. S. Kim, S. J. Jo, S. W. Lee, W. J. Kim, H. K. Baik and S. J. Lee

      Article first published online: 24 JAN 2007 | DOI: 10.1002/adfm.200600747

      Thumbnail image of graphical abstract

      Enhanced pentacene quality and reduced hysteresis are observed in the current–voltage (I–V) measurements for poly(4-vinylphenol) (PVP)-coated pentacene thin-film transistors (TFTs: see figure). Since grain boundaries and OH groups are believed to trap electrons, an OH-free and smoother gate dielectric is favorable for the formation of the interface between the pentacene and gate dielectric with a low trap density.

    16. Optical Power Limiters Based on Colorless Di-, Oligo-, and Polymetallaynes: Highly Transparent Materials for Eye Protection Devices (pages 963–975)

      G.-J. Zhou, W.-Y. Wong, C. Ye and Z. Lin

      Article first published online: 24 JAN 2007 | DOI: 10.1002/adfm.200600855

      Thumbnail image of graphical abstract

      Colorless and solution-processable polymetallaynes of Pt, Au, and Hg are excellent optical power limiters to nanosecond laser pulses with optimized optical transparency/nonlinearity trade-offs (see figure) and they perform superior to the state-of-the-art C60 and metallophthalocyanine dyes. The role of gold and mercury in optical-limiting applications for eye protection devices is also highlighted.

    17. Magnetic-Core/Porous-Shell CoFe2O4/SiO2 Composite Nanoparticles as Immobilized Affinity Supports for Clinical Immunoassays (pages 976–982)

      D. Tang, R. Yuan, Y. Chai and H. An

      Article first published online: 5 FEB 2007 | DOI: 10.1002/adfm.200600462

      Thumbnail image of graphical abstract

      The immobilization of antibodies onto composite nanoparticles composed of a magnetic ferrite core and a porous silica shell enables the detection of breast cancer markers by a quartz crystal microbalance (QCM) assay, as schematically depicted in the figure. The biofunctionalized magnetic nanoparticles enable the formation, isolation, and physical separation of biorecognition complexes from complex biological mixtures by means of an external magnet.

    18. Ambipolar Conductive 2,7-Carbazole Derivatives for Electroluminescent Devices (pages 983–995)

      J.-Y. Shen, X.-L. Yang, T.-H. Huang, J. T. Lin, T.-H. Ke, L.-Y. Chen, C.-C. Wu and M.-C. P. Yeh

      Article first published online: 5 FEB 2007 | DOI: 10.1002/adfm.200600921

      Thumbnail image of graphical abstract

      Carbazole derivatives incorporating arylamines at the 2 and 7 positions (see figure) are synthesized. Devices that incorporate these light-emitting materials exhibit ambipolar conducting behavior with good hole and electron mobilities (ca. 10-4 cm2 V–1 s–1). These materials can be used as hole-transporting and/or emitting layer in double-layered electroluminescent devices.

    19. A Strategy for the Detection of Diels–Alder Reactions Using Fluorescence Quenching of Conjugated Polymers (pages 996–1002)

      F. He, Y. Tang, M. Yu, S. Wang, Y. Li and D. Zhu

      Article first published online: 19 FEB 2007 | DOI: 10.1002/adfm.200600115

      Thumbnail image of graphical abstract

      The fluorescence quenching of conjugated polymers linked with pendant furan groups (see figure) upon the Diels–Alder reaction of the furan moieties provides a powerful diagnostic for monitoring the progress of Diels–Alder reactions, enabling use of these systems as platforms for screening Diels–Alder catalysts.

    20. Highly Efficient Electrochemiluminescence of Functionalized Tris(2,2′-bipyridyl)ruthenium(II) and Selective Concentration Enrichment of Its Coreactants (pages 1003–1009)

      Y. Xu, Y. Gao, T. Li, Y. Du, J. Li and E. Wang

      Article first published online: 1 FEB 2007 | DOI: 10.1002/adfm.200600537

      Thumbnail image of graphical abstract

      The addition of an ionic liquid to a ruthenium bipyridyl complex results in highly efficient electrochemiluminescence from the complex resulting from weak binding (see figure). When adding the same ionic liquid to a ruthenium bipyridyl/co-reactant system a polarity change at the glassy carbon electrode is observed. The reasons behind these phenomena and investigations into different co-reactant systems are explored in this paper.

    21. Replication and Coating of Silica Templates by Hydrothermal Carbonization (pages 1010–1018)

      M.-M. Titirici, A. Thomas and M. Antonietti

      Article first published online: 1 FEB 2007 | DOI: 10.1002/adfm.200600501

      Thumbnail image of graphical abstract

      Hydrothermal carbonization of furfural at mild temperatures is performed in the presence of silica templates, which are subsequently removed by treatment with HF. The morphology of these carbon materials can be tuned according to the surface polarity of the template into macroporous casts, mesoporous hollow spheres, or mesoporous replicas (see figure).

    22. Highly Efficient Orange and Green Solid-State Light-Emitting Electrochemical Cells Based on Cationic IrIII Complexes with Enhanced Steric Hindrance (pages 1019–1027)

      H.-C. Su, F.-C. Fang, T.-Y. Hwu, H.-H. Hsieh, H.-F. Chen, G.-H. Lee, S.-M. Peng, K.-T. Wong and C.-C. Wu

      Article first published online: 1 FEB 2007 | DOI: 10.1002/adfm.200600372

      Thumbnail image of graphical abstract

      Efficient orange and green solid-state light-emitting electrochemical cells are prepared (see figure), based on the cationic tris-cyclometallated iridium(III) complexes [Ir(ppy)2sb]PF6 and [Ir(dFppy)2sb]PF6. The properties of the light-emitting cells are based on the increased steric hindrance induced by the introduction of the 4,5-diaza-9,9′-spirobifluorene (sb) ligand, which results in a decrease of nonradiative relaxation pathways.

    23. Monodisperse Starburst Oligofluorene-Functionalized 4,4′,4″-Tris(carbazol-9-yl)-triphenylamines: Their Synthesis and Deep-Blue Fluorescent Properties for Organic Light-Emitting Diode Applications (pages 1028–1036)

      Q.-D. Liu, J. Lu, J. Ding, M. Day, Y. Tao, P. Barrios, J. Stupak, K. Chan, J. Li and Y. Chi

      Article first published online: 29 JAN 2007 | DOI: 10.1002/adfm.200600104

      Thumbnail image of graphical abstract

      Four monodisperse starburst oligomers bearing a 4,4′,4″-tris(carbazol-9-yl)-triphenylamine core and six uniform oligofluorene arms are synthesized (see figure). They display excellent photoluminescence and electroluminescence properties as hole-transporting materials and deep-blue-light emitters; they also perform well as the host material for red-electrophosphorescence emitters.

  4. Index

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

SEARCH

SEARCH BY CITATION