Advanced Materials

Cover image for Vol. 23 Issue 7

February 15, 2011

Volume 23, Issue 7

Pages 799–914

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correction
    6. Progress Report
    7. Review
    8. Communications
    9. Frontispiece
    10. Communications
    1. Bionanoelectronics: Bionanoelectronics (Adv. Mater. 7/2011) (page 799)

      Aleksandr Noy

      Version of Record online: 15 FEB 2011 | DOI: 10.1002/adma.201190012

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      The emerging field of bionanoelectronics seeks to combine biological molecules and cells with electronic components to create devices that enable bidirectional flow of information between biological organisms and artificial objects. These efforts could produce a new generation of medical diagnostic tools that monitor cellular level changes for early signs of disease, smart prosthetics controlled by brain signals, and sophisticated neural interfaces that could make computer or mobile phone keyboards obsolete. Progress in this fascinating field is reported on p. 807 by Aleksandr Noy

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correction
    6. Progress Report
    7. Review
    8. Communications
    9. Frontispiece
    10. Communications
    1. Dichroic Optical Structures: Selective Dichroic Patterning by Nanosecond Laser Treatment of Ag Nanostripes (Adv. Mater. 7/2011) (page 800)

      Juan R. Sanchez-Valencia, Johann Toudert, Ana Borras, Angel Barranco, Ruth Lahoz, German F. de la Fuente, Fabian Frutos and Agustin R. Gonzalez-Elipe

      Version of Record online: 15 FEB 2011 | DOI: 10.1002/adma.201190013

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      The inside cover illustrates the fabrication process of dichroic optical patterns by nanosecond laser processing of silver-decorated, oriented SiO2 nanocolumns. Using this straightforward methodology, reported by Johann Toudert, Ana Borras, and co-workers on p. 848, it is possible to selectively tune the surface plasmon of the silver nanostripes along the visible range as a function of the laser power during the irradiation. These optical structures are of application for optical encryption and related applications.

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correction
    6. Progress Report
    7. Review
    8. Communications
    9. Frontispiece
    10. Communications
  4. Correction

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correction
    6. Progress Report
    7. Review
    8. Communications
    9. Frontispiece
    10. Communications
    1. You have free access to this content
      Correction: Superhydrophobic Coatings: The Salvinia Paradox: Superhydrophobic Surfaces with Hydrophilic Pins for Air Retention Under Water (Adv. Mater. 21/2010) (page 806)

      Wilhelm Barthlott, Thomas Schimmel, Sabine Wiersch, Kerstin Koch, Martin Brede, Matthias Barczewski, Stefan Walheim, Aaron Weis, Anke Kaltenmaier, Alfred Leder and Holger F. Bohn

      Version of Record online: 15 FEB 2011 | DOI: 10.1002/adma.201190015

  5. Progress Report

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correction
    6. Progress Report
    7. Review
    8. Communications
    9. Frontispiece
    10. Communications
    1. Bionanoelectronics (pages 807–820)

      Aleksandr Noy

      Version of Record online: 22 DEC 2010 | DOI: 10.1002/adma.201003751

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      Bionanoelectronic devices that combine biological and electronic components in nanoscale architectures could enable bidirectional communication between biological organisms and artificial objects. These devices may produce a new generation of diagnostic tools, smart prosthetics, and sophisticated neural interfaces and also reveal the inner workings of the biological systems in unprecedented detail.

  6. Review

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correction
    6. Progress Report
    7. Review
    8. Communications
    9. Frontispiece
    10. Communications
    1. Magnetic Materials and Devices for the 21st Century: Stronger, Lighter, and More Energy Efficient (pages 821–842)

      Oliver Gutfleisch, Matthew A. Willard, Ekkes Brück, Christina H. Chen, S. G. Sankar and J. Ping Liu

      Version of Record online: 15 DEC 2010 | DOI: 10.1002/adma.201002180

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      A new energy paradigm, consisting of greater reliance on renewable energy sources and increased concern for energy efficiency, has accelerated research in energy-related technologies. Magnetic materials play an important role in improving the efficiency and performance of many devices. The impacts of hard magnets on electric motor and transportation technologies, of soft magnets on electricity generation and conversion technologies, and of magnetocaloric materials for refrigeration are discussed.

  7. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correction
    6. Progress Report
    7. Review
    8. Communications
    9. Frontispiece
    10. Communications
    1. Design and Non-Lithographic Fabrication of Light Trapping Structures for Thin Film Silicon Solar Cells (pages 843–847)

      Xing Sheng, Jifeng Liu, Inna Kozinsky, Anuradha M. Agarwal, Jurgen Michel and Lionel C. Kimerling

      Version of Record online: 13 DEC 2010 | DOI: 10.1002/adma.201003217

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      A self-assembled light trapping structure is numerically designed on the backside of thin film silicon solar cells and fabricated by using porous alumina as a template. We demonstrate this structure can effectively increase the optical absorption and thus improve the solar cell performances.

    2. Selective Dichroic Patterning by Nanosecond Laser Treatment of Ag Nanostripes (pages 848–853)

      Juan R. Sanchez-Valencia, Johann Toudert, Ana Borras, Angel Barranco, Ruth Lahoz, German F. de la Fuente, Fabian Frutos and Agustin R. Gonzalez-Elipe

      Version of Record online: 15 DEC 2010 | DOI: 10.1002/adma.201003933

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      A simple route for the fabrication of dichroic optical structures based on Ag nanoparticles deposited onto SiO2 nanocolumns is presented. The strict control of the optical response is achieved after infrared laser treatment of the supported nanoparticles with a commercial nanosecond pulsed laser. Preliminary examples of the utilization of the laser-treated AgNPs/SiO2 nanocolumn system for optical recoding and encryption are shown.

    3. Metal-Catalyzed Growth of Semiconductor Nanostructures Without Solubility and Diffusivity Constraints (pages 854–859)

      Zumin Wang, Lin Gu, Fritz Phillipp, Jiang Y. Wang, Lars P. H. Jeurgens and Eric J. Mittemeijer

      Version of Record online: 27 DEC 2010 | DOI: 10.1002/adma.201002997

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      This study stunningly reveals that metal-catalyzed growth of semiconductor nanostructures can be realized even in the absence of any solubility and diffusivity of the semiconductor in the metal catalyst. Using in situ heating electron microscopy, the yet unrecognized growth mechanism is unraveled at the atomic scale for the Al-catalyzed growth of crystalline Si nanostructures at temperatures as low as 150 °C.

    4. Conformable Solid-Index Phase Masks Composed of High-Aspect-Ratio Micropillar Arrays and Their Application to 3D Nanopatterning (pages 860–864)

      Junyong Park, Jae Hong Park, Eunhye Kim, Chi Won Ahn, Hyun Ik Jang, John A. Rogers and Seokwoo Jeon

      Version of Record online: 10 JAN 2011 | DOI: 10.1002/adma.201003885

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      Defect-free and dense micropillar arrays with a high aspect ratio are replicated from etched Si masters using high-modulus polyurethane acrylate. The newly designed conformable solid-index mask can generate high-resolution 3D nanostructures that can be patterned through proximity field nanopatterning (PnP) in a single exposure step. The superb optical property proves the quality of 3D nanostructures.

    5. The MEMOLED: Active Addressing with Passive Driving (pages 865–868)

      Kamal Asadi, Paul W. M. Blom and Dago M. de Leeuw

      Version of Record online: 7 JAN 2011 | DOI: 10.1002/adma.201003213

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      Passive or active matrix driving schemes in large displays are prone to high power consumption and cost, respectively. For signage applications such as large out-door displays with low refresh rates there is as yet no technological solution. Here the MEMOLED solution, an organic light-emitting diode with an integrated ferroelectric memory, is presented. Programmability of the integrated memory allows active addressing of the OLED in a passive matrix geometry.

    6. Elastically Tunable Self-Organized Organic Lasers (pages 869–872)

      Patrick Görrn, Marcus Lehnhardt, Wolfgang Kowalsky, Thomas Riedl and Sigurd Wagner

      Version of Record online: 7 JAN 2011 | DOI: 10.1002/adma.201003108

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      Organic lasers that rely on sinusoidal, tunable distributed-feedback gratings formed by self-organization of the surface of elastomeric PDMS are demonstrated. The lasing wavelength can be tuned by stretching. The simple fabrication of the lasers on potentially large areas enables entirely new applications such as a strain-sensing optical skin for structural health monitoring.

    7. Compact Hybrid Cell Based on a Convoluted Nanowire Structure for Harvesting Solar and Mechanical Energy (pages 873–877)

      Chen Xu and Zhong Lin Wang

      Version of Record online: 7 JAN 2011 | DOI: 10.1002/adma.201003696

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      A fully integrated, solid-state, compact hybrid cell (CHC) that comprises “convoluted” ZnO nanowire structures for concurrent harvesting of both solar and mechanical energy is demonstrated. The compact hybrid cell is based on a conjunction design of an organic solid-state dye-sensitized solar cell (DSSC) and piezoelectric nanogenerator in one compact structure. The CHC shows a significant increase in output power, clearly demonstrating its potential for simultaneously harvesting multiple types of energy for powering small electronic devices for independent, sustainable, and mobile operation.

    8. Non-Volatile Photochemical Gating of an Epitaxial Graphene/Polymer Heterostructure (pages 878–882)

      Samuel Lara-Avila, Kasper Moth-Poulsen, Rositza Yakimova, Thomas Bjørnholm, Vladimir Fal’ko, Alexander Tzalenchuk and Sergey Kubatkin

      Version of Record online: 7 JAN 2011 | DOI: 10.1002/adma.201003993

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      A novel heterostructure based on epitaxial graphene grown on silicon carbide combined with two polymers is demonstrated, with a neutral spacer and a photoactive layer that provides potent electron acceptors under UV light exposure. UV exposure of this heterostructure enables control of the electrical parameters of graphene in a non-invasive, non-volatile, and reversible way.

  8. Frontispiece

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correction
    6. Progress Report
    7. Review
    8. Communications
    9. Frontispiece
    10. Communications
    1. LIQUID-CRYSTAL COMPOSITES: Multicolor Polymer-Dispersed Liquid Crystal (Adv. Mater. 7/2011) (page 883)

      Naomi Kumano, Takahiro Seki, Masahiko Ishii, Hiroshi Nakamura, Tomonari Umemura and Yukikazu Takeoka

      Version of Record online: 15 FEB 2011 | DOI: 10.1002/adma.201190016

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      A composite consisting of a phase-separated porous polymer network and a liquid crystal that can change its structural color (covering the whole visible region) in response to temperature is reported by Yukikazu Takeoka and co-workers. The response is achieved by means of changes in both the diffraction properties and the wavelength dispersions of the refractive indices. on page 883

  9. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correction
    6. Progress Report
    7. Review
    8. Communications
    9. Frontispiece
    10. Communications
    1. Multicolor Polymer-Dispersed Liquid Crystal (pages 884–888)

      Naomi Kumano, Takahiro Seki, Masahiko Ishii, Hiroshi Nakamura, Tomonari Umemura and Yukikazu Takeoka

      Version of Record online: 27 DEC 2010 | DOI: 10.1002/adma.201003660

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      The potential of a self-assembled phase-separated macroporous polymer film filled with an appropriate solvent for application in a functional multicolor polymer-dispersed liquid crystal (PDLC) display is explored. The findings dem-onstrate that a phase-separated porous MMAA-BIS polymer network filled with mixed LCs of 5CB and 5PCH can exhibit changes in structural color covering the whole visible region and an opaque milky color upon temperature variation. This system may be available for energy-saving multicolor displays.

    2. Improvement of Electroluminescence Performance of Organic Light-Emitting Diodes with a Liquid-Emitting Layer by Introduction of Electrolyte and a Hole-Blocking Layer (pages 889–893)

      Shuzo Hirata, Korefumi Kubota, Heo Hyo Jung, Osamu Hirata, Kenichi Goushi, Masayuki Yahiro and Chihaya Adachi

      Version of Record online: 22 DEC 2010 | DOI: 10.1002/adma.201003505

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      Organic light-emitting diodes containing a liquid emitting layer that exhibit improved external electroluminescence quantum efficiency (ΦEL) and maximum luminance are presented. Doping the liquid emitting layer with an electrolyte significantly decreases the turn-on voltage for electroluminescence. Insertion of a TiO2 hole-blocking layer between the liquid emitting layer and indium tin oxide cathode improves ΦEL.

    3. A High Gain and High Charge Carrier Mobility Indenofluorene-Phenanthrene Copolymer for Light Amplification and Organic Lasing (pages 894–897)

      Hun Kim, Niels Schulte, Gang Zhou, Klaus Müllen and Frédéric Laquai

      Version of Record online: 15 DEC 2010 | DOI: 10.1002/adma.201003797

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      Amplified spontaneous emission with unprecedented gain values is demonstrated from thin films of novel blue-light-emitting indenofluorene-phenanthrene copolymers. In addition to their excellent photoluminescence properties, high charge-carrier mobilities are observed, which makes these copolymers very promising for organic light amplifiers and lasers.

    4. Woven Electrochemical Transistors on Silk Fibers (pages 898–901)

      Christian Müller, Mahiar Hamedi, Roger Karlsson, Ronnie Jansson, Rebeca Marcilla, My Hedhammar and Olle Inganäs

      Version of Record online: 20 DEC 2010 | DOI: 10.1002/adma.201003601

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      Woven electrochemical transistors on silk fibers from the silkworm Bombyx mori are demonstrated. This is achieved with carefully chosen electrolyte chem-istry: electrically conducting silk fibers are produced by dyeing silk fibers with a conjugated polyelectrolyte and gating is accomplished by use of an electro-lyte mixture composed of imidazolium-based ionic liquids.

    5. Low-Power High-Performance Non-Volatile Memory on a Flexible Substrate with Excellent Endurance (pages 902–905)

      Chun-Hu Cheng, Fon-Shan Yeh and Albert Chin

      Version of Record online: 20 DEC 2010 | DOI: 10.1002/adma.201002946

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      Very high performance Ni/GeOx/HfON/TaN non-volatile resistive memory is fabricated using the covalently bonded dielectric GeOx and metal oxynitride HfON as well as low cost electrodes. The device shows low set and reset powers, good 85 °C retention, and 105 endurance, which are near to the characteristics of existing commercial flash memory.

    6. Carbon Nanotube Webs: A Novel Material for Sensor Applications (pages 906–910)

      Mustafa Musameh, Marta Redrado Notivoli, Mark Hickey, Ilias Louis Kyratzis, Yuan Gao, Chi Huynh and Stephen C. Hawkins

      Version of Record online: 20 DEC 2010 | DOI: 10.1002/adma.201003836

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      Carbon nanotube (CNT) web electrodes with high electrical conductivity, alignment, flexibility, and mechanical and chemical stabilities are fabricated by directly drawing from the edge of a CNT forest without using any binders. Different electrode geometries such as planar, yarn, ring, and ribbon are produced. Their high hydrophobicity and large surface area enable the extraction and ultrasensitive detection of organophosphate pesticides.

    7. Photoenhancement of a Quantum Dot Nanocomposite via UV Annealing and its Application to White LEDs (pages 911–914)

      Kyungnam Kim, Ju Yeon Woo, Sohee Jeong and Chang-Soo Han

      Version of Record online: 27 DEC 2010 | DOI: 10.1002/adma.201002979

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      The irreversible photoenhancement of a quantum dot (QD) nanocomposite is demonstrated using UV photo-annealing. The QD nanocomposite consists of a mixture of thermally curable polymer and a QD, which is synthesized as a core/multishell nanocrystal, CdSe/CdS/CdZnS/ZnS. Exposure under 365-nm UV illumination for 30 min at 70 W surprisingly reveals that the photoluminescence of the QD nanocomposite increases 1.8 times.

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