Advanced Materials

Cover image for Vol. 23 Issue 19

May 17, 2011

Volume 23, Issue 19

Pages 2127–2243

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Review
    7. Communications
    8. Frontispiece
    9. Communications
    10. Research News
    1. CNT Electronics: Nearly Single-Chirality Single-Walled Carbon Nanotubes Produced via Orthogonal Iterative Density Gradient Ultracentrifugation (Adv. Mater. 19/2011) (page 2127)

      Alexander A. Green and Mark C. Hersam

      Version of Record online: 9 MAY 2011 | DOI: 10.1002/adma.201190067

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      The cover depicts a thin-film transistor formed from a randomly oriented network of (6,5) single-walled carbon nanotubes. On p. 2185, Alexander Green and Mark Hersam describe a method of producing nearly single-chirality single-walled carbon nanotubes using iterative orthogonal density gradient ultracentrifugation. Semiconducting carbon nanotubes produced using this technique offer exceptional performance in thin-film transistors and are promising optoelectronic materials.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Review
    7. Communications
    8. Frontispiece
    9. Communications
    10. Research News
    1. Lasing: Room Temperature Excitonic Whispering Gallery Mode Lasing from High-Quality Hexagonal ZnO Microdisks (Adv. Mater. 19/2011) (page 2128)

      Rui Chen, Bo Ling, Xiao Wei Sun and Han Dong Sun

      Version of Record online: 9 MAY 2011 | DOI: 10.1002/adma.201190068

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      Ultraviolet excitonic whispering gallery mode (WGM) lasing from individual hexagonal-shaped ZnO microdisks is reported on p. 2199 by Han Dong Sun and co-workers. The inside cover illustrates the five growth processes for the ZnO microdisks and WGM lasing emitted from the edges of such disks. The work provides detailed WGM lasing characteristics for the microdisks, which may lead to promising applications for low-threshold UV lasers and high-sensitivity sensors.

  3. Contents

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

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Review
    7. Communications
    8. Frontispiece
    9. Communications
    10. Research News
    1. An Emerging Pore-Making Strategy: Confined Swelling-Induced Pore Generation in Block Copolymer Materials (pages 2134–2148)

      Yong Wang and Fengbin Li

      Version of Record online: 5 APR 2011 | DOI: 10.1002/adma.201004022

      Thumbnail image of graphical abstract

      Well-defined porous materials, such as 1D nanofibers, 2D thin films, and 3D bulk materials from block copolymers, are produced via a confined swelling-induced pore generation strategy. The strategy is extreme simple and leads to pores with high regularity. It does not involve chemical reactions and the pore-forming process is reversible. The mechanism, kinetics control, morphology tunability, and applications of this emerging method are discussed.

  5. Review

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Review
    7. Communications
    8. Frontispiece
    9. Communications
    10. Research News
    1. Photocontrollable Liquid-Crystalline Actuators (pages 2149–2180)

      Haifeng Yu and Tomiki Ikeda

      Version of Record online: 12 APR 2011 | DOI: 10.1002/adma.201100131

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      Coupling photochromic molecules with liquid crystalline (LC) materials enables one to reversibly photocontrol unique LC features such as phase transition, photoalignment, and molecular cooperative motion. LC elastomers show photomechanical and photomobile properties, directly converting light energy into mechanical energy. In well-defined LC block copolymers, regular patternings of nanostructures in macroscopic scales are fabricated by photo-manipulation of LC actuators.

  6. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Review
    7. Communications
    8. Frontispiece
    9. Communications
    10. Research News
    1. Conductive Atomic Force Microscope Nanopatterning of Epitaxial Graphene on SiC(0001) in Ambient Conditions (pages 2181–2184)

      Justice M. P. Alaboson, Qing Hua Wang, Joshua A. Kellar, Joohee Park, Jeffrey W. Elam, Michael J. Pellin and Mark C. Hersam

      Version of Record online: 7 MAR 2011 | DOI: 10.1002/adma.201100367

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      Conductive atomic force microscope (cAFM) nanopatterning is demonstrated on epitaxial graphene on SiC (0001) under ambient conditions. Nanopatterning kinetics and chemistry suggest that ambient cAFM nanopatterning induces local oxidization with the surface, interface, and bulk layers of epitaxial graphene on SiC (0001) playing distinct roles in the depth profile of the final nanopatterned structure.

    2. Nearly Single-Chirality Single-Walled Carbon Nanotubes Produced via Orthogonal Iterative Density Gradient Ultracentrifugation (pages 2185–2190)

      Alexander A. Green and Mark C. Hersam

      Version of Record online: 7 APR 2011 | DOI: 10.1002/adma.201100034

      Thumbnail image of graphical abstract

      We describe how iterative, orthogonal density gradient ultracentrifugation (DGU) separations can be used to produce nearly single-chirality (6,5) SWNTs. SWNT network transistors made from these highly pure, ≥98% semiconducting SWNTs simultaneously exhibit high on/off ratios, mobilities, and on-state conductances, suggesting their future application in integrated circuits and near-infrared optoelectronic light emitters and photodetectors.

    3. Enhancement of the Thermoelectric Figure-of-Merit in a Wide Temperature Range in In4Se3–xCl0.03 Bulk Crystals (pages 2191–2194)

      Jong-Soo Rhyee, Kyunghan Ahn, Kyu Hyoung Lee, Hyo Seok Ji and Ji-Hoon Shim

      Version of Record online: 5 APR 2011 | DOI: 10.1002/adma.201004739

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      The state-of-the-art record of thermo­electric figure-of-merit (ZT) of 1.53 at 425 °C is achieved by chlorine doping in In4Se3–xCl0.03 bulk crystalline materials as used for n-type thermoelectric energy harvesting. The low-dimensional property imparted by chlorine doping significantly increases the electrical conductivity and reduces the thermal conductivity resulting in a high power factor over a wide temperature range.

    4. A Versatile Fréchet-Dendron Compound Unifies Host-Guest and Templated Heterogeneous Self-Assembly (pages 2195–2198)

      Kathrin Gruber, Carsten Rohr, Lukas J. Scherer, Michael S. Malarek, Edwin C. Constable and Bianca A. Hermann

      Version of Record online: 5 APR 2011 | DOI: 10.1002/adma.201100013

      Thumbnail image of graphical abstract

      To date, heterogeneous patterns on surfaces could assemble either in host-guest or templated structures only. A Fréchet-type dendron now shows both classes of ordering and thus connects both assembly types. Depending on the type of interaction with the guest molecule, saturated adamantane is included in an existing host structure, while aromatic coronene templates a new molecular ordering.

    5. Room Temperature Excitonic Whispering Gallery Mode Lasing from High-Quality Hexagonal ZnO Microdisks (pages 2199–2204)

      Rui Chen, Bo Ling, Xiao Wei Sun and Han Dong Sun

      Version of Record online: 4 APR 2011 | DOI: 10.1002/adma.201100423

      Thumbnail image of graphical abstract

      High-quality ZnO microdisks are prepared by a vapor phase transport method. The ZnO microdisks have perfect hexagonal shape and exhibit strong excitonic lasing under optical excitation at room temperature. The observed lasing modes match well with whispering gallery modes.

    6. Self-Assembled Multilayers of Vertically Aligned Semiconductor Nanorods on Device-Scale Areas (pages 2205–2209)

      Marco Zanella, Raquel Gomes, Mauro Povia, Cinzia Giannini, Yang Zhang, Alexander Riskin, Marlies Van Bael, Zeger Hens and Liberato Manna

      Version of Record online: 5 APR 2011 | DOI: 10.1002/adma.201100539

      Thumbnail image of graphical abstract

      Drop casting of highly concentrated solutions of nanorods in high boiling point solvents, followed by slow solvent evaporation, leads to the formation of crack-free multilayers of vertically aligned rods in square centimeter areas.

  7. Frontispiece

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Review
    7. Communications
    8. Frontispiece
    9. Communications
    10. Research News
    1. Shape-Memory Polymers: Novel Biodegradable Shape-Memory Elastomers with Drug-Releasing Capabilities (Adv. Mater. 19/2011) (page 2210)

      M. Concepcion Serrano, Luis Carbajal and Guillermo A. Ameer

      Version of Record online: 9 MAY 2011 | DOI: 10.1002/adma.201190070

      Thumbnail image of graphical abstract

      Shape-memory poly(diol-co-citrates) are poly-esters with thermosensitive optical and mechanical behaviour. Below their transition temperature (Ttrans) these materials become opaque and hard, whereas above Ttrans they are transparent elastomers. The mechanism for these phenomena includes the formation of reversible physical crosslinks within the covalently cross-linked polymer network, report Guillermo Ameer and co-workers on p. 2211.

  8. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Review
    7. Communications
    8. Frontispiece
    9. Communications
    10. Research News
    1. Novel Biodegradable Shape-Memory Elastomers with Drug-Releasing Capabilities (pages 2211–2215)

      M. Concepcion Serrano, Luis Carbajal and Guillermo A. Ameer

      Version of Record online: 23 FEB 2011 | DOI: 10.1002/adma.201004566

      Thumbnail image of graphical abstract

      Novel polydiolcitrate elastomers with thermally induced shape-memory properties are synthesized. These thermoresponsive polymers can be prepared as films or porous 3D sponges. Above their transition temperature, these materials display an elastomeric behavior, but below their transition temperature they have a glassy state. This thermally induced transition allows for the acquisition of their dual shape.

    2. Giant Magnetic Field Effects on Electroluminescence in Electrochemical Cells (pages 2216–2220)

      Ming Shao, Liang Yan, Haiping Pan, Ilia Ivanov and Bin Hu

      Version of Record online: 4 APR 2011 | DOI: 10.1002/adma.201100193

      Thumbnail image of graphical abstract

      Giant magnetic field effects on electroluminescence intensity with a magnitude of 400% are demonstrated by using Lorentz force effects in an electrochemical co-reaction with planar electrodes. A magnetic field increases the ion penetration in the diffusion layer in the electrochemical reaction through Lorentz force effects and greatly enhances the electrogenerated chemiluminescence intensity (ECL), leading to giant magnetic field effects in liquid states.

    3. Graphene-Encapsulated Nanoparticle-Based Biosensor for the Selective Detection of Cancer Biomarkers (pages 2221–2225)

      Sung Myung, Aniruddh Solanki, Cheoljin Kim, Jaesung Park, Kwang S. Kim and Ki-Bum Lee

      Version of Record online: 5 APR 2011 | DOI: 10.1002/adma.201100014

      Thumbnail image of graphical abstract

      Biosensors, based on graphene-encapsulated nanoparticle arrays, for highly sensitive and selective detection of breast cancer biomarkers are successfully demonstrated. The increased surface-to-volume ratio significantly helped in lowering the detection limits (1 pM) for the target biomarkers. In addition, the highly selective nature of the biosensor is demonstrated by detecting low concentrations of the target biomarkers.

    4. Efficient, Air-Stable Bulk Heterojunction Polymer Solar Cells Using MoOx as the Anode Interfacial Layer (pages 2226–2230)

      Yanming Sun, Christopher J. Takacs, Sarah R. Cowan, Jung Hwa Seo, Xiong Gong, Anshuman Roy and Alan J. Heeger

      Version of Record online: 5 APR 2011 | DOI: 10.1002/adma.201100038

      Thumbnail image of graphical abstract

      The use of molybdenum oxide as the anode interfacial layer in conventional bulk heterojunction polymer solar cells leads to an improved power conversion efficiency and also dramatically increases the device stability. This indicates that the engineering of improved anode interface materials is an important method by which to fabricate efficient and stable polymer solar cells.

    5. Aligned Carbon Nanotube Arrays for Degradation-Resistant, Intimate Contact in Micromechanical Devices (pages 2231–2236)

      Jungwook Choi, Jae-Ik Lee, Youngkee Eun, Min-Ook Kim and Jongbaeg Kim

      Version of Record online: 4 APR 2011 | DOI: 10.1002/adma.201100472

      Thumbnail image of graphical abstract

      A highly reliable micromechanical contact based on aligned carbon nanotube (CNT) arrays is demonstrated and characterized. The CNT arrays are synthesized directly on three-terminal microelectromechanical systems, and they are adjusted and simultaneously preloaded during the synthetic process, making intimate micromechanical contacts. It is found that the CNT array-to-array contact improves upon conventional solid-to-solid micromechanical contact.

  9. Research News

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Review
    7. Communications
    8. Frontispiece
    9. Communications
    10. Research News
    1. Thermo-Switchable Materials Prepared Using the OEGMA-Platform (pages 2237–2243)

      Jean-François Lutz

      Version of Record online: 5 APR 2011 | DOI: 10.1002/adma.201100597

      Thumbnail image of graphical abstract

      The (controlled) radical polymerization of oligo(ethylene glycol) methacrylates (OEGMAs) is a new construction platform in materials science. Indeed, thermoresponsive polymers constructed with OEGMAs allow design of a wide variety of smart materials such as polymer-enzyme bio-hybrids, injectable hydrogels, capsules for drug-release, modified magnetic particles for in vivo utilization, cell-culture substrates, antibacterial surfaces, or stationary phases for bioseparation.

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