Advanced Materials

Cover image for Vol. 19 Issue 14

July, 2007

Volume 19, Issue 14

Pages 1783–1880

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Correction
    5. Progress Report
    6. Communications
    7. Index
    1. Cover Picture: Epitaxial Growth of Indium Arsenide Nanowires on Silicon Using Nucleation Templates Formed by Self-Assembled Organic Coatings (Adv. Mater. 14/2007)

      T. Mårtensson, J. B. Wagner, E. Hilner, A. Mikkelsen, C. Thelander, J. Stangl, B. J. Ohlsson, A. Gustafsson, E. Lundgren, L. Samuelson and W. Seifert

      Article first published online: 6 JUL 2007 | DOI: 10.1002/adma.200790053

      Thumbnail image of graphical abstract

      Indium arsenide nanowires are grown directly on silicon substrates (see figure and cover) using a method employing self-assembled organic coatings to create oxide-based growth templates. High-performance materials, such as InAs, could have great impact on future nanoelectronics if integrated with Si, but integration has so far been hard to realize with other methods.

  2. Contents

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Correction
    5. Progress Report
    6. Communications
    7. Index
    1. Contents: Adv. Mater. 14/2007 (pages 1783–1789)

      Article first published online: 6 JUL 2007 | DOI: 10.1002/adma.200790050

  3. Correction

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Correction
    5. Progress Report
    6. Communications
    7. Index
    1. You have free access to this content
      Intracellular Trafficking of Carbon Nanotubes by Confocal Laser Scanning Microscopy (page 1789)

      L. Lacerda, G. Pastorin, D. Gathercole, J. Buddle, M. Prato, A. Bianco and K. Kostarelos

      Article first published online: 6 JUL 2007 | DOI: 10.1002/adma.200790051

      This article corrects:

      Intracellular Trafficking of Carbon Nanotubes by Confocal Laser Scanning Microscopy1

      Vol. 19, Issue 11, 1480–1484, Article first published online: 10 MAY 2007

  4. Progress Report

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Correction
    5. Progress Report
    6. Communications
    7. Index
    1. Ambipolar Transport in Organic Conjugated Materials (pages 1791–1799)

      J. Cornil, J.-L. Brédas, J. Zaumseil and H. Sirringhaus

      Article first published online: 18 JUN 2007 | DOI: 10.1002/adma.200602922

      Thumbnail image of graphical abstract

      Charge transport in organic semiconductors is discussed. Based on theoretical considerations, the mobility of electrons in organic semiconductors should not differ much from that of holes. Attention is given to the factors that hinder the observation of intrinsic electron transport, and to strategies that have been developed to promote ambipolar transport in field-effect transistors (see figure).

  5. Communications

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Correction
    5. Progress Report
    6. Communications
    7. Index
    1. Epitaxial Growth of Indium Arsenide Nanowires on Silicon Using Nucleation Templates Formed by Self-Assembled Organic Coatings (pages 1801–1806)

      T. Mårtensson, J. B. Wagner, E. Hilner, A. Mikkelsen, C. Thelander, J. Stangl, B. J. Ohlsson, A. Gustafsson, E. Lundgren, L. Samuelson and W. Seifert

      Article first published online: 18 JUN 2007 | DOI: 10.1002/adma.200700285

      Thumbnail image of graphical abstract

      Indium arsenide nanowires are grown directly on silicon substrates (see figure and cover) using a method employing self-assembled organic coatings to create oxide-based growth templates. High-performance materials, such as InAs, could have great impact on future nanoelectronics if integrated with Si, but integration has so far been hard to realize with other methods.

    2. Growth of Single Crystals of MgCNi3 (pages 1807–1809)

      H.-S. Lee, D.-J. Jang, H.-G. Lee, S.-I. Lee, S.-M. Choi and C.-J. Kim

      Article first published online: 20 JUN 2007 | DOI: 10.1002/adma.200602194

      Thumbnail image of graphical abstract

      Even six years after the first discovery of superconductivity in MgCNi3, the synthesis of this compound in the form of single crystals has not been very successful. Highly volatile Mg and less-reactive C are the main obstacles. Now, the synthesis and characterization of these single crystals are reported (see figure), which will provide opportunities to solve quite a number of longstanding controversial issues in MgCNi3.

    3. Engineered Microcapsules Fabricated from Reconstituted Spider Silk (pages 1810–1815)

      K. D. Hermanson, D. Huemmerich, T. Scheibel and A. R. Bausch

      Article first published online: 20 JUN 2007 | DOI: 10.1002/adma.200602709

      Thumbnail image of graphical abstract

      Recombinant spider-silk proteins are used to produce responsive microcapsules with good mechanical and chemical stability (see figure). Emulsion interfaces are harnessed to induce the controlled self-assembly of these proteins into predominantly β-sheet configurations, resulting in a mechanically stable thin polymer shell. Capsules transferred into a continuous phase can readily encapsulate large molecules, while allowing small molecules to permeate freely.

    4. Fabrication of Oligonucleotide Chips by Using Parallel Cantilever-Based Electrochemical Deposition in Picoliter Volumes (pages 1816–1821)

      E. Descamps, T. Leïchlé, B. Corso, S. Laurent, P. Mailley, L. Nicu, T. Livache and C. Bergaud

      Article first published online: 6 JUL 2007 | DOI: 10.1002/adma.200602152

      Thumbnail image of graphical abstract

      The use of a parallel cantilever-based deposition system as an electrospotting tool in picoliter volumes is demonstrated. Applied in conjunction with polypyrrole electrochemistry, this generic approach for fabricating biochips is optimized for oligonucleotide chips featuring micrometer spots of different sequences with high reproducibility and specificity (see figure).

    5. High Field-Effect Mobilities for Diblock Copolymers of Poly(3-hexylthiophene) and Poly(methyl acrylate) (pages 1822–1825)

      G. Sauvé and R. D. McCullough

      Article first published online: 25 JUN 2007 | DOI: 10.1002/adma.200602368

      Thumbnail image of graphical abstract

      High field-effect mobilities from diblock copolymers of regioregular poly(3-hexylthiophene) and poly(methyl acrylate) (PMA) are reported. The mobilities are achieved at several PMA contents provided the SiO2 surface is treated with octyltrichlorosilane. The mobility decreases with increasing PMA content when the SiO2 surface is untreated. These results show the importance of self-assembly at the interface for good FET performance in bottom-contact FET devices.

    6. A Novel Strategy for Two-Photon Holographic Recording: Stepwise Two-Photon Absorption of α-Quinquethiophene Followed by Energy Transfer to an Aryl Azide (pages 1826–1829)

      M. Shimizu, M. Schelper, K. Mochida, T. Hiyama, M. Adachi, Y. Sasaki, S. Akiyama, S. Maeda, H. Kanbara, Y. Mori and T. Kurihara

      Article first published online: 12 JUN 2007 | DOI: 10.1002/adma.200700432

      Thumbnail image of graphical abstract

      An efficient method for two-photon holographic recording is demonstrated. Two-photon absorption from gate and holographic lights is effected by silicon-terminated α-quinquethiophene, and data recording is achieved by a co- existing 3,3′-diazidodiphenyl sulfone (see figure). The efficiency of the thiophene–azide system is at least two orders of magnitude higher than that of a biacetyl-based system.

    7. Gas-Sorption Selectivity of CUK-1: A Porous Coordination Solid Made of Cobalt(II) and Pyridine-2,4- Dicarboxylic Acid (pages 1830–1834)

      J. W. Yoon, S. H. Jhung, Y. K. Hwang, S. M. Humphrey, P. T. Wood and J.-S. Chang

      Article first published online: 14 JUN 2007 | DOI: 10.1002/adma.200601983

      Thumbnail image of graphical abstract

      As a size-selective molecular sieve, the coordination polymer formed from cobalt and pyridine-2,4-dicarboxylic acid (CUK-1, see figure) shows unprecedented selectivity for O2 and preferential selectivity for CO2 over CH4. The present sorption results encourage the development of new adsorbent materials that may find use in the production of high-purity gas products. This work demonstrates that CUK-1 can be utilized, for the first time, in the separation of light gases via gas chromatography.

    8. Enhancing the Photovoltage of Polymer Solar Cells by Using a Modified Cathode (pages 1835–1838)

      F. Zhang, M. Ceder and O. Inganäs

      Article first published online: 20 JUN 2007 | DOI: 10.1002/adma.200602597

      Thumbnail image of graphical abstract

      Enhancements in open circuit voltage, photocurrent (see figure), and fill factor are observed by inserting a thin poly(ethylene oxide) layer between a metal electrode (Al) and active layers in polymer solar cells based on a polyfluorene copolymer poly((2,7-(9-(2′-ethylhexyl)-9-hexyl-fluorene)-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole))-co-(2,7-(9-(2′-ethylhexyl)-9-hexyl-fluorene)-alt-2,5-thiophene))(APFO-5) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) under illumination of AM 1.5 (100 mW cm–2).

    9. Twinned Zn2TiO4 Spinel Nanowires Using ZnO Nanowires as a Template (pages 1839–1844)

      Y. Yang, X. W. Sun, B. K. Tay, J. X. Wang, Z. L. Dong and H. M. Fan

      Article first published online: 18 JUN 2007 | DOI: 10.1002/adma.200700299

      Thumbnail image of graphical abstract

      Ternary twinned Zn2TiO4spinel nanowires are formed by a solid-state reaction between Ti and ZnO from an amorphous Ti-coated ZnO core/shell nanowire structure. The ZnO nanowires are used as templates to spatially confine the formation of Zn2TiO4 nanowires. TEM investigations (see figure) reveal the nature of both the ZnO/Ti core/shell structure and the <111>-oriented growth of the twinned spinel nanowires.

    10. Eu-doped Boron Nitride Nanotubes as a Nanometer-Sized Visible-Light Source (pages 1845–1848)

      H. Chen, Y. Chen, C. P. Li, H. Zhang, J. S. Williams, Y. Liu, Z. Liu and S. P. Ringer

      Article first published online: 6 JUL 2007 | DOI: 10.1002/adma.200700493

      Thumbnail image of graphical abstract

      A broad and tunable visible-light emission, excited by electrons, from Eu-doped BN nanotubes has been realized for the first time (see SEM image and corresponding cathodoluminescence, CL, image). The special broad light emission is due to the insertion of Eu2+ ions into the nanotube walls via in situ Eu doping during nanotube growth instead of a common post-synthesis doping process.

    11. From Well-Defined Carbon-Rich Precursors to Monodisperse Carbon Particles with Hierarchic Structures (pages 1849–1853)

      L. Zhi, J. Wang, G. Cui, M. Kastler, B. Schmaltz, U. Kolb, U. Jonas and K. Müllen

      Article first published online: 14 JUN 2007 | DOI: 10.1002/adma.200602365

      Thumbnail image of graphical abstract

      A method for preparing carbon nanoparticles (CNPs) with controllable hierarchic structures is developed by combining the precursor-defined pyrolysis and the template method. Well-organized monodisperse CNPs, such as spherical particles with 3D porous structures (a), hollow carbon orbs containing small Pt particles (b), and graphitic microbeads with or without slits (c), are prepared by using structurally different precursors (see figure).

    12. Ultrafine Single-Crystalline Gold Nanowire Arrays by Oriented Attachment (pages 1854–1858)

      A. Halder and N. Ravishankar

      Article first published online: 18 JUN 2007 | DOI: 10.1002/adma.200602325

      Thumbnail image of graphical abstract

      Ultrafine single-crystalline gold nanowires (see figure) are synthesized by oriented attachment of nanoparticles in the solution phase. An amine capping agent is preferentially removed from the {111} planes, which causes the wires to form by fusion along these planes. Such nanowires can be used as the fundamental building blocks for nanoelectronics, and will enable basic studies on electric transport in one-dimensional structures to be carried out.

    13. White Electroluminescence from a Single Polymer System: Improved Performance by Means of Enhanced Efficiency and Red-Shifted Luminescence of the Blue-Light-Emitting Species (pages 1859–1863)

      J. Liu, S. Y. Shao, L. Chen, Z. Y. Xie, Y. X. Cheng, Y. H. Geng, L. X. Wang, X. B. Jing and F. S. Wang

      Article first published online: 18 JUN 2007 | DOI: 10.1002/adma.200602942

      Thumbnail image of graphical abstract

      High-efficiency white electroluminescence from a single polymer is achieved by enhancing the electroluminescence efficiency and effecting a red-shift in the emission spectrum of the blue emissive species. A single-layer device of the resultant polymer exhibits a higher luminous efficiency than the nonmodified species (12.8 cd A–1, see figure) and an external quantum efficiency of 5.4 % with CIE coordinates of (0.31,0.36), exemplifying the success of the reported methodology.

    14. High Carrier Mobility of Organic Field-Effect Transistors with a Thiophene–Naphthalene Mesomorphic Semiconductor (pages 1864–1868)

      K. Oikawa, H. Monobe, K. Nakayama, T. Kimoto, K. Tsuchiya, B. Heinrich, D. Guillon, Y. Shimizu and M. Yokoyama

      Article first published online: 20 JUN 2007 | DOI: 10.1002/adma.200602608

      Thumbnail image of graphical abstract

      A novel calamitic mesophase semiconductor based on symmetrically designed thiophene–naphthalene, 2,6-di(5′-n-octyl-2′-thienyl)naphthalene, is used as the active layer in a field-effect transistor and the device performance is studied (see figure). This mesogen has an excellently high mobility of 0.14 cm2 V–1s–1 in a polycrystalline film at room temperature.

    15. High-Pressure Multianvil Synthesis and Structure Refinement of Oxygen-Bearing Cubic Zirconium(IV) Nitride (pages 1869–1873)

      D. A. Dzivenko, A. Zerr, V. K. Bulatov, G. Miehe, J. Li, B. Thybusch, J. Brötz, H. Fueß, G. Brey and R. Riedel

      Article first published online: 20 JUN 2007 | DOI: 10.1002/adma.200602610

      Thumbnail image of graphical abstract

      Macroscopic amounts of oxygen-bearing c-Zr3N4with a cubic Th3P4-type structure are synthesized for the first time (see figure) at high pressures and temperatures. Structure refinement based on X-ray diffraction data is performed. The Raman spectrum, morphology, and microhardness of the synthesized material is measured.

    16. A High-Performance Magnetic Resonance Imaging T2 Contrast Agent (pages 1874–1878)

      J. Qin, S. Laurent, Y. S. Jo, A. Roch, M. Mikhaylova, Z. M. Bhujwalla, R. N. Muller and M. Muhammed

      Article first published online: 6 JUL 2007 | DOI: 10.1002/adma.200602326

      Thumbnail image of graphical abstract

      A high-performance magnetic resonance imaging T2 contrast agent has been prepared via phase transfer of hydrophobic superparamagnetic iron oxide nanoparticles (SPIONs) to an aqueous solution by using Pluronic F127 copolymers. As seen in the figure, a hierarchical structure of the surface coating is formed and proven to be a crucial characteristic to enhance not only water dispersibility, but also the efficacy as a T2 contrast agent.

      Corrected by:

      Correction: A High-Performance Magnetic Resonance Imaging T2 Contrast Agent

      Vol. 19, Issue 18, 2411, Article first published online: 10 SEP 2007

  6. Index

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Correction
    5. Progress Report
    6. Communications
    7. Index
    1. Author Index and Subject Index Adv. Mater. 14/2007 (pages 1879–1880)

      Article first published online: 6 JUL 2007 | DOI: 10.1002/adma.200790052

SEARCH

SEARCH BY CITATION