Advanced Functional Materials

Cover image for Vol. 16 Issue 14

September, 2006

Volume 16, Issue 14

Pages 1785–1914

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Full Papers
    5. Index
    1. Cover Picture: Solution-Processed Organic Tandem Solar Cells (Adv. Funct. Mater. 14/2006)

      A. Hadipour, B. de Boer, J. Wildeman, F. B. Kooistra, J. C. Hummelen, M. G. R. Turbiez, M. M. Wienk, R. A. J. Janssen and P. W. M. Blom

      Version of Record online: 12 SEP 2006 | DOI: 10.1002/adfm.200690050

      A solution-processed organic photovoltaic tandem cell (see figure and cover) is demonstrated that is constructed from two polymers (PTBEHT/PCBM, PFDTBT/PCBM) with complementary absorption spectra that absorb from the UV to the near-IR. The tandem solar cell is electrically connected in series and the open-circuit voltage of the tandem is the sum of the open-circuit voltages of the two subcells.

  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. Electrotunable Non-reciprocal Laser Emission from a Liquid-Crystal Photonic Device (pages 1793–1798)

      M. H. Song, B. Park, S. Nishimura, T. Toyooka, I. J. Chung, Y. Takanishi, K. Ishikawa and H. Takezoe

      Version of Record online: 16 AUG 2006 | DOI: 10.1002/adfm.200600107

      Thumbnail image of graphical abstract

      Electrotunable non-reciprocal light transmittance and unidirectional circularly polarized lasing are shown for an anisotropic optical heterojunction structure—a phase-retarding nematic liquid crystal (NLC) layer sandwiched between two polymer cholesteric liquid crystal (PCLC) films. Reorienting of the NLC molecules under applied voltage (see figure) and selective reflection by the PCLC films lead to electroswitchable lasing and electrotunable lasing.

    2. Fluorescent Liquid-Crystal Gels with Electrically Switchable Photoluminescence (pages 1799–1804)

      X. Tong, Y. Zhao, B.-K. An and S. Y. Park

      Version of Record online: 21 AUG 2006 | DOI: 10.1002/adfm.200500868

      Thumbnail image of graphical abstract

      Fluorescent self-assembled liquid gels are prepared for the first time through the use of a gelator showing aggregation-induced enhanced emission. The photoluminescence, arising from the fibrous aggregates of the gelator (see figure), can be repeatedly switched by an electric field. Modulating the excitation light through electric-field- induced liquid crystal orientation offers new ways to achieve and explore electrically controllable photoluminescence. Figure width: 200 μm.

    3. Synthesis of Nearly Monodisperse Iron Oxide and Oxyhydroxide Nanocrystals (pages 1805–1813)

      X. Liang, X. Wang, J. Zhuang, Y. Chen, D. Wang and Y. Li

      Version of Record online: 8 AUG 2006 | DOI: 10.1002/adfm.200500884

      Thumbnail image of graphical abstract

      Uniform magnetite, hematite, and goethite nanocrystals are obtained through an attractive method based on an oleic acid/alcohol/water system. All the products can be well dispersed in a cyclohexane solvent to form transparent colloids with vivid colors (see figure). The influence of the preparation conditions as well as the magnetic properties of doped magnetite particles are revealed.

    4. Highly Fluorinated Comb-Shaped Copolymers as Proton Exchange Membranes (PEMs): Improving PEM Properties Through Rational Design (pages 1814–1822)

      T. B. Norsten, M. D. Guiver, J. Murphy, T. Astill, T. Navessin, S. Holdcroft, B. L. Frankamp, V. M. Rotello and J. Ding

      Version of Record online: 8 AUG 2006 | DOI: 10.1002/adfm.200500763

      Thumbnail image of graphical abstract

      Morphological control of polymer microstructure is pursued as a strategy to improve proton conductivity and minimize swelling due to hydration in proton exchange membrane fuel cells (see figure). A highly fluorinated comb-shaped polymer, which forms distinct microphase separated domains (figure inset) resulting in membranes with relatively high proton conductivities and correspondingly low degrees of swelling, is prepared.

    5. Photoelectrochemical Reactivity of a Hybrid Electrode Composed of Polyoxophosphotungstate Encapsulated in Titania Nanotubes (pages 1823–1831)

      Y. B. Xie

      Version of Record online: 8 AUG 2006 | DOI: 10.1002/adfm.200500695

      Thumbnail image of graphical abstract

      A functionalized polyoxophosphotungstate–titania/titanium hybrid electrode (POW–TiO2/Ti; see figure) is fabricated by encapsulating POW nanoaggregates into a TiO2 nanotube array. Its chemical stability and photocatalytic and photoelectrocatalytic activities are shown to be markedly superior to those of POW roughly aggregated onto the surface of a multiporous TiO2 film.

    6. Parameters Influencing Charge Separation in Solid-State Dye-Sensitized Solar Cells Using Novel Hole Conductors (pages 1832–1838)

      J. E. Kroeze, N. Hirata, L. Schmidt-Mende, C. Orizu, S. D. Ogier, K. Carr, M. Grätzel and J. R. Durrant

      Version of Record online: 21 AUG 2006 | DOI: 10.1002/adfm.200500748

      Thumbnail image of graphical abstract

      The control of interfacial charge transfer is of key importance in the design of solid-state dye-sensitized solar cells. Using a series of novel triarylamine-type hole conductors (see figure) that vary in molecular weight and mobility, the factors determining charge transfer at the dye/hole conductor interface have been determined.

    7. Luminescence of Functionalized Carbon Nanotubes as a Tool to Monitor Bundle Formation and Dissociation in Water: The Effect of Plasmid-DNA Complexation (pages 1839–1846)

      L. Lacerda, G. Pastorin, W. Wu, M. Prato, A. Bianco and K. Kostarelos

      Version of Record online: 16 AUG 2006 | DOI: 10.1002/adfm.200500569

      Thumbnail image of graphical abstract

      Aqueous dispersions of functionalized carbon nanotube (f-CNT) complexes with plasmid DNA are studied using UV-vis luminescence spectrophotometry (see figure). The measured fluorescence intensity is correlated with the aggregation state of the f-CNTs: a high intensity indicates improved f-CNT individualization and dispersion, while a decrease in fluorescence intensity indicates a higher degree of nanotube aggregation and bundling.

    8. A Family of Far-Infrared-Transmitting Glasses in the Ga–Ge–Te System for Space Applications (pages 1847–1852)

      S. Danto, P. Houizot, C. Boussard-Pledel, X.-H. Zhang, F. Smektala and J. Lucas

      Version of Record online: 21 AUG 2006 | DOI: 10.1002/adfm.200500645

      Thumbnail image of graphical abstract

      Synthesis of Te-based bulk optical glasses containing 70 to 80 % Te in a Ga–Ge–Te system is reported. The optical transmission window of these glasses is exceptional, ranging from 1.99 to 28 μm, making them suitable for the production of far-infrared-transmitting optical fibers (see figure), desirable for fabrication of nulling interferometers for space applications such as on the Darwin mission.

    9. Synthesis, Characterization, and Application of Mesoporous Silica Functionalized with Alkyl-Hydroperoxides (pages 1853–1858)

      M. Sasidharan, Y. Kiyozumi, N. K. Mal and F. Mizukami

      Version of Record online: 8 AUG 2006 | DOI: 10.1002/adfm.200500721

      Thumbnail image of graphical abstract

      A variety of alkyl hydroperoxides have been functionalized onto ordered mesoporous SBA-15 from their corresponding covalently anchored synthons (see figure). tert-Hydroperoxides are prepared by autoxidation using molecular O2, whereas primary hydroperoxides are obtained by reaction with H2O2. The silica-supported alkyl hydroperoxides exhibit high activity in the epoxidation of styrene to styrene epoxide.

    10. Enhancement of Interconnectivity in the Channels of Pentacene Thin-Film Transistors and Its Effect on Field-Effect Mobility (pages 1859–1864)

      H. S. Lee, D. H. Kim, J. H. Cho, Y. D. Park, J. S. Kim and K. Cho

      Version of Record online: 16 AUG 2006 | DOI: 10.1002/adfm.200500854

      Thumbnail image of graphical abstract

      Interconnectivity in the channels of pentacene TFTs can be enhanced by two-step deposition (1st layer 10 nm: 0.1 Å s–1, 2nd layer 40 nm: 4.0 Å s–1) (see figure). A smaller number of voids is observed at the interface between the pentacene film and insulator, which results in field-effect mobilities as high as 1.2 cm2 V–1 s–1. This approach to improving the quality of small-molecule active layers will be beneficial to TFT production.

    11. A pH-Responsive Gating Membrane System with Pumping Effects for Improved Controlled Release (pages 1865–1872)

      J.-B. Qu, L.-Y. Chu, M. Yang, R. Xie, L. Hu and W.-M. Chen

      Version of Record online: 8 AUG 2006 | DOI: 10.1002/adfm.200500897

      Thumbnail image of graphical abstract

      pH-responsive polymer pumps composed of a porous membrane with linear-grafted poly(methacrylic acid) (PMAA) gates acting as functional valves and a crosslinked poly(N,N-dimethylaminoethyl methacrylate) (PDM) hydrogel inside the reservoir are a novel route to “smart” controlled-release systems. The cooperative, simultaneous pH responses of the acidic- and basic-responsive polymers accelerate the responsive release rate by a pumping effect (see figure).

    12. The First Inert and Photostable Encapsulated Lanthanide(III) Complexes Based on Dendritic 9,10-Diphenylanthracene Ligands: Synthesis, Strong Near-Infrared Emission Enhancement, and Photophysical Studies (pages 1873–1882)

      N. S. Baek, Y. H. Kim, S.-G. Roh, B. K. Kwak and H. K. Kim

      Version of Record online: 8 AUG 2006 | DOI: 10.1002/adfm.200500835

      Thumbnail image of graphical abstract

      The near-infrared emission intensities of Er3+ions in encapsulated Er3+—dendrimer complexes are dramatically enhanced on increasing the generation number of the dendrons, owing to light-harvesting and site-isolation effects (see figure). The energy-transfer (ET) efficiency between the dendritic anthracene ligands and Ln3+ via the excited singlet-state was evaluated as being in the range of 90 to 97 %.

    13. Mesostructured Silica Chemically Doped with RuII as a Superior Optical Oxygen Sensor (pages 1883–1891)

      B. Lei, B. Li, H. Zhang, S. Lu, Z. Zheng, W. Li and Y. Wang

      Version of Record online: 8 AUG 2006 | DOI: 10.1002/adfm.200500737

      Thumbnail image of graphical abstract

      The graphic shows a possible structure of a RuII complex covalently grafted within cetyltrimethylammoniumbromide template-directed mesostructured silica. It is possible to covalently graft the RuII complex onto mesosphered silica for oxygen sensing. The mesostructured oxygen sensors show superior properties to those of amorphous samples. Uniformity, improved sensitivity, and a simplified calibration sensor can also be obtained.

    14. High-Quality Photonic Crystals Infiltrated with Quantum Dots (pages 1892–1896)

      C. Paquet, F. Yoshino, L. Levina, I. Gourevich, E. H. Sargent and E. Kumacheva

      Version of Record online: 16 AUG 2006 | DOI: 10.1002/adfm.200500845

      Thumbnail image of graphical abstract

      Fabrication of photonic crystals infiltrated with PbS quantum dots (QDs) offers a promising route to all-optical limiters. An approach to preparing polymer colloidal crystals heavily loaded with PbS QDs in the interstitial space is reported. The approach uses capillary forces to infiltrate PbS QDs into interstitial spaces and produces high-quality photonic crystals with uniform loading of PbS QDs (see figure).

    15. Solution-Processed Organic Tandem Solar Cells (pages 1897–1903)

      A. Hadipour, B. de Boer, J. Wildeman, F. B. Kooistra, J. C. Hummelen, M. G. R. Turbiez, M. M. Wienk, R. A. J. Janssen and P. W. M. Blom

      Version of Record online: 28 AUG 2006 | DOI: 10.1002/adfm.200600138

      Thumbnail image of graphical abstract

      A solution-processed organic photovoltaic tandem cell (see figure and cover) is demonstrated that is constructed from two polymers (PTBEHT/PCBM, PFDTBT/PCBM) with complementary absorption spectra that absorb from the UV to the near-IR. The tandem solar cell is electrically connected in series and the open-circuit voltage of the tandem is the sum of the open-circuit voltages of the two subcells.

    16. Crystallinity Control of a Nanostructured LiNi0.5Mn1.5O4 Spinel via Polymer-Assisted Synthesis: A Method for Improving Its Rate Capability and Performance in 5 V Lithium Batteries (pages 1904–1912)

      J. C. Arrebola, A. Caballero, M. Cruz, L. Hernán, J. Morales and E. R. Castellón

      Version of Record online: 16 AUG 2006 | DOI: 10.1002/adfm.200500892

      Thumbnail image of graphical abstract

      Nanometric LiNi0.5Mn1.5O4 prepared using a polymer-assisted method can be used as a cathode in lithium cells with expanded rate capabilities, excellent coulombic efficiency, and the ability to withstand fast-charge–slow-discharge processes (see figure). This results from the combination of nanometer-sized particles with high crystallinity, which is enhanced by the presence of the polymer during the synthetic procedure.

  4. Index

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

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