Advanced Functional Materials

Cover image for Vol. 16 Issue 6

April, 2006

Volume 16, Issue 6

Pages 727–848

    1. Cover Picture: Tuning the Dimensions of C60-Based Needlelike Crystals in Blended Thin Films (Adv. Funct. Mater. 6/2006)

      A. Swinnen, I. Haeldermans, M. vande Ven, J. D'Haen, G. Vanhoyland, S. Aresu, M. D'Olieslaeger and J. Manca

      Version of Record online: 30 MAR 2006 | DOI: 10.1002/adfm.200690021

      Needlelike crystalline structures of the C60-derivative PCBM ([6-6]-phenyl C61-butyric acid methyl ester; see figure and cover) can be tuned in dimension and spatial distribution by submitting films of PCBM blended with poly(3-hexylthiophene) in various blend ratios to an appropriate thermal treatment. Different analytical techniques are used to study the occurring growth mechanisms.

    2. Ion-Current Rectification in Nanopores and Nanotubes with Broken Symmetry (pages 735–746)

      Z. S. Siwy

      Version of Record online: 6 MAR 2006 | DOI: 10.1002/adfm.200500471

      Thumbnail image of graphical abstract

      Ion transport through nanoporous systems (see figure), with special emphasis on rectification phenomena, is focused on in this article. Experimental and theoretical evidence that ion-current rectification is inherent to asymmetric nanoporous systems with excess surface charge is provided and discussed, and the possibility of tuning the direction and extent of rectification is examined in detail. The next challenge is to apply these systems to the detection and separation of charged molecules.

    3. Organic Nanoparticles: Preparation, Self-Assembly, and Properties (pages 747–753)

      R. Jagannathan, G. Irvin, T. Blanton and S. Jagannathan

      Version of Record online: 6 MAR 2006 | DOI: 10.1002/adfm.200600003

      Thumbnail image of graphical abstract

      Organic nanoparticles rapidly self-assemble at room temperature into stable superlattices with a high degree of alignment when solution-cast from dispersions or spray coated directly onto substrates. Functional OLEDs with process-tunable electroluminescence (see figure) have been built with nanoparticles that have the same host–dopant emissive-material composition.

    4. Dual-Functionalized Polymer Nanotubes as Substrates for Molecular-Probe and DNA-Carrier Applications (pages 754–759)

      J. Jang, S. Ko and Y. Kim

      Version of Record online: 1 MAR 2006 | DOI: 10.1002/adfm.200500832

      Thumbnail image of graphical abstract

      Bifunctionalized polymer nanotubes (PNTs) are fabricated using vapor-deposition polymerization followed by the attachment of amine-functionalized silica nanoparticles. The nanotubes are applied as both a molecular probe and a DNA carrier (see figure) by conjugating pyreneacetic acid with amine groups, and by immobilizing DNA with carboxylic acid groups on the surface.

    5. Tuning the Dimensions of C60-Based Needlelike Crystals in Blended Thin Films (pages 760–765)

      A. Swinnen, I. Haeldermans, M. vande Ven, J. D'Haen, G. Vanhoyland, S. Aresu, M. D'Olieslaeger and J. Manca

      Version of Record online: 21 FEB 2006 | DOI: 10.1002/adfm.200500812

      Thumbnail image of graphical abstract

      Needlelike crystalline structures of the C60-derivative PCBM ([6-6]-phenyl C61-butyric acid methyl ester; see figure and cover) can be tuned in dimension and spatial distribution by submitting films of PCBM blended with poly(3-hexylthiophene) in various blend ratios to an appropriate thermal treatment. Different analytical techniques are used to study the occurring growth mechanisms.

    6. Formation of Silver Nanoprisms with Surface Plasmons at Communication Wavelengths (pages 766–773)

      V. Bastys, I. Pastoriza-Santos, B. Rodríguez-González, R. Vaisnoras and L. M. Liz-Marzán

      Version of Record online: 13 MAR 2006 | DOI: 10.1002/adfm.200500667

      Thumbnail image of graphical abstract

      Silver nanoprisms with strong absorption in the near-IR are synthesized using a modification of the photoinduced method: preformed silver seeds are illuminated by LEDs or white light combined with different color filters. The final sizes of the nanoprisms are tuned, without affecting their shape and thickness, by controlling the illumination conditions (see figure).

    7. Deep-UV Photochemistry and Patterning of (Aminoethylaminomethyl)phenethylsiloxane Self-Assembled Monolayers (pages 774–783)

      M.-S. Chen, C. S. Dulcey, L. A. Chrisey and W. J. Dressick

      Version of Record online: 13 MAR 2006 | DOI: 10.1002/adfm.200500744

      Thumbnail image of graphical abstract

      Monolayer templates of (aminoethylaminomethyl)phenethylsiloxane, suitable for fabrication of high-resolution, negative-tone, electroless metal or fluorescently labeled DNA features, can be fabricated readily by direct monolayer patterning using deep-UV (193 nm) at low exposure doses (approximately 400 mJ cm–2). The figure shows an example of DNA (red) patterning.

    8. Photomultiplication in Disordered Unipolar Organic Materials (pages 784–790)

      J. Reynaert, V. I. Arkhipov, P. Heremans and J. Poortmans

      Version of Record online: 13 MAR 2006 | DOI: 10.1002/adfm.200500578

      Thumbnail image of graphical abstract

      Strong photomultiplication has been observed in evaporated single layers of F16CuPc and double-layer devices of NiPc and C60 (Pc: phthalocyanine). The photomultiplication is explained in terms of prolonged relaxation of photoexcited charge carriers in an energetically disordered organic material (see figure for F16CuPc).

    9. Synthesis, Properties, and Photopolymerization of Liquid-Crystalline Oxetanes: Application in Transflective Liquid-Crystal Displays (pages 791–798)

      B. M. I. van der Zande, S. J. Roosendaal, C. Doornkamp, J. Steenbakkers and J. Lub

      Version of Record online: 7 MAR 2006 | DOI: 10.1002/adfm.200500359

      Thumbnail image of graphical abstract

      Thermally stable and non-corrugated films with alternating birefringent and isotropic parts (see figure) are formed by changing the molecular order of a mixture of oxetane monomers on the microscale using a combination of heating and photopolymerization in air. The thermal stability of these films makes them candidates for use in high-performance transflective liquid-crystal displays.

    10. Lateral Epitaxial Overgrowth of ZnO in Water at 90 °C (pages 799–804)

      D. Andeen, J. H. Kim, F. F. Lange, G. K. L. Goh and S. Tripathy

      Version of Record online: 6 MAR 2006 | DOI: 10.1002/adfm.200500817

      Thumbnail image of graphical abstract

      Lateral epitaxial overgrowth (LEO) of ZnO in zinc-precursor solutions at 90 °C has been demonstrated. Addition of sodium citrate controls out-of-plane growth, while a reduction in threading dislocations is also observed. Double LEO demonstrates the possibility of complete dislocation reduction. The scanning electron microscopy image shows a cleaved cross section of LEO ZnO.

    11. Transfer Printing Water-Soluble Inorganic Salts (pages 805–811)

      Z. Zheng, O. Azzaroni, M. E. Vickers and W. T. S. Huck

      Version of Record online: 23 FEB 2006 | DOI: 10.1002/adfm.200500574

      Thumbnail image of graphical abstract

      Fabrication of microscale salt patterns using transfer printing with poly(dimethylsiloxane) stamps “inked” with a range of inorganic salts (see figure; scale bar: 4 μm) is reported. The resulting ultrathin salt films can be used as water-soluble masks in metal evaporation/lift-off fabrication procedures or as masks in reactive-ion etching.

    12. Poly(ϵ-caprolactone)-Functionalized Carbon Nanotubes and Their Biodegradation Properties (pages 812–818)

      H.-L. Zeng, C. Gao and D.-Y. Yan

      Version of Record online: 23 FEB 2006 | DOI: 10.1002/adfm.200500607

      Thumbnail image of graphical abstract

      Biodegradable poly(ϵ-caprolactone) (PCL)-functionalized carbon nanotubes (CNTs) (see figure) can be prepared by in situ ring-opening polymerization. The grafted PCL content can be easily controlled by adjusting the feed ratio. In the presence of pseudomonas lipase, the PCL grafted onto CNTs is completely biodegraded within four days, while the CNTs retain their tube structure and morphology.

    13. Crystallization of Amorphous Tris(8-hydroxyquinoline)aluminum Nanoparticles and Transformation to Nanowires (pages 819–823)

      C.-P. Cho, C.-A. Wu and T.-P. Perng

      Version of Record online: 16 FEB 2006 | DOI: 10.1002/adfm.200500631

      Thumbnail image of graphical abstract

      Amorphous AlQ3nanoparticles grow directly into α-crystalline nanowires via an appropriate heat-treatment method. Their initial growth is observed after heating at 150 °C for only one minute (see figure). The growth of the nanowires is dictated by anisotropic π–π interactions between pairs of ligands from neighboring AlQ3 molecules, and the growth mechanism can be interpreted by a concept of nucleation and molecular migration.

    14. Heterojunction Ambipolar Organic Transistors Fabricated by a Two-Step Vacuum-Deposition Process (pages 824–830)

      J. Wang, H. Wang, X. Yan, H. Huang, D. Jin, J. Shi, Y. Tang and D. Yan

      Version of Record online: 16 FEB 2006 | DOI: 10.1002/adfm.200500111

      Thumbnail image of graphical abstract

      Air-stable, ambipolar organic field- effect transistors are fabricated, with a heterojunction of copper phthalocyanine (CuPc) and hexadecafluorophthalocyaninatocopper (F16CuPc). The heterojunction has an interpenetrating network (see figure) and displays significant ambipolar charge transport, with symmetric electron and hole mobilities of the order of 10–4 cm2 V–1 s–1 in air.

    15. Molecular n-Type Doping of 1,4,5,8-Naphthalene Tetracarboxylic Dianhydride by Pyronin B Studied Using Direct and Inverse Photoelectron Spectroscopies (pages 831–837)

      C. K. Chan, E.-G. Kim, J.-L. Brédas and A. Kahn

      Version of Record online: 16 FEB 2006 | DOI: 10.1002/adfm.200500402

      Thumbnail image of graphical abstract

      The organic semiconductor 1,4,5,8-naphthalene tetracarboxylic dianhydride (NTCDA) is n-doped by the pyronin B neutral radical. Direct and inverse photoemission spectroscopy, in conjunction with density functional theory, elucidates the molecular energy levels relevant to electron transfer (see figure). Current–voltage measurements confirm n-doping.

    16. Amorphous Diphenylaminofluorene-Functionalized Iridium Complexes for High-Efficiency Electrophosphorescent Light-Emitting Diodes (pages 838–846)

      W.-Y. Wong, G.-J. Zhou, X.-M. Yu, H.-S. Kwok and B.-Z. Tang

      Version of Record online: 6 MAR 2006 | DOI: 10.1002/adfm.200500523

      Thumbnail image of graphical abstract

      New homoleptic and heteroleptic cyclometalated iridium complexes of (9,9-diethyl-7-pyridinylfluoren-2-yl)diphenylamine (see figure) are shown to be amorphous solids with high glass-transition temperatures. Organic LEDs fabricated using these iridium-based phosphors as dopant emitters and constructed with a multilayer configuration show very high efficiencies.

SEARCH

SEARCH BY CITATION