Advanced Materials

Cover image for Advanced Materials

February 16, 2009

Volume 21, Issue 7

Pages 735–832

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Progress Report
    5. Communications
    6. Research News
    7. Index
    1. You have full text access to this OnlineOpen article
      Fluorescent Nanostructures: Direct Laser Writing of Nanosized Oligofluorene Truxenes in UV-Transparent Photoresist Microstructures (Adv. Mater. 7/2009)

      Alexander J. C. Kuehne, David Elfström, Allan R. Mackintosh, Alexander L. Kanibolotsky, Benoit Guilhabert, Erdan Gu, Igor F. Perepichka, Peter J. Skabara, Martin D. Dawson and Richard A. Pethrick

      Article first published online: 9 FEB 2009 | DOI: 10.1002/adma.200990022

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      Fluorescent nanostructures within a transparent microstructure can be achieved via direct laser writing. On p. 781, Alexander Kuehne, Peter Skabara, Martin Dawson, Richard Pethrick, and co-workers report on a novel UV-transparent photoresist that incorporates star-shaped nanometer-sized oligofluorene truxenes. The method and materials will find applications in optical, electro-optical, and photonic devices. (Cover artwork by Leif Heuser).

  2. Contents

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Progress Report
    5. Communications
    6. Research News
    7. Index
    1. Contents: (Adv. Mater. 7/2009) (pages 735–741)

      Article first published online: 9 FEB 2009 | DOI: 10.1002/adma.200990023

  3. Progress Report

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Progress Report
    5. Communications
    6. Research News
    7. Index
    1. Hydrogels for Soft Machines (pages 743–756)

      Paul Calvert

      Article first published online: 4 DEC 2008 | DOI: 10.1002/adma.200800534

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      Until recently, synthetic gels have been too weak for any engineering use. Strong double-network gels and other reinforced gels open the possibility of new biomedical devices, and may replace rubber in some applications. Immediate needs include a better understanding of the relationship between mechanical properties and structure in gels, and convenient methods for processing gels.

  4. Communications

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Progress Report
    5. Communications
    6. Research News
    7. Index
    1. Enhanced Charge Separation by Sieve-Layer Mediation in High-Efficiency Inorganic-Organic Solar Cells (pages 759–763)

      Chien-Hung Lin, Surojit Chattopadhyay, Chia-Wen Hsu, Meng-Hsiu Wu, Wei-Chao Chen, Chien-Ting Wu, Shao-Chin Tseng, Jih-Shang Hwang, Jiun-Haw Lee, Chun-Wei Chen, Cheng-Hsuan Chen, Li-Chyong Chen and Kuei-Hsien Chen

      Article first published online: 15 DEC 2008 | DOI: 10.1002/adma.200701309

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      The introduction of a thin electronic sieve layer of a material with a wide bandgap, such as lithium fluoride (LiF) or silicon oxide (SiOx), at the inorganic-organic interface of an organic photovoltaic device enhances the charge separation and improves the efficiency by more than an order to a maximum of 6.04%.

    2. Porous One-Dimensional Photonic Crystals Improve the Power-Conversion Efficiency of Dye-Sensitized Solar Cells (pages 764–770)

      Silvia Colodrero, Agustín Mihi, Leif Häggman, Manuel Ocaña, Gerrit Boschloo, Anders Hagfeldt and Hernán Míguez

      Article first published online: 16 DEC 2008 | DOI: 10.1002/adma.200703115

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      The solar-to-electric power-conversion efficiency (η) of dye-sensitized solar cells can be greatly enhanced by integrating a mesoporous, nanoparticle-based, 1D photonic crystal as a coherent scattering layer in the device. The photogenerated current is greatly improved without altering the open-circuit voltage of the cell, while keeping the transparency of the cell intact. Improved average η values between 15% and 30% are attained.

    3. Electrically Controllable Omnidirectional Laser Emission from a Helical-Polymer Network Composite Film (pages 771–775)

      Byoungchoo Park, Mina Kim, Sun Woong Kim, Wongun Jang, Hideo Takezoe, Yunki Kim, Eun Ha Choi, Yoon Ho Seo, Guang Sup Cho and Seung Oun Kang

      Article first published online: 12 DEC 2008 | DOI: 10.1002/adma.200800729

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      A liquid-crystal/polymer composite is used to produce a photonic bandgap system. Films of the composite show a large field-induced reversible color shift of the reflection band of over 150 nm. Intensity-controllable laser emission at relatively low lasing thresholds is generated from composite films doped with dye. Moreover, the laser exhibits omnidirectional emission propagation on application of an electric field.

    4. Solar-thermochromism of Pseudocrystalline Nanodroplets of Ionic Liquid–NiII Complexes Immobilized inside Translucent Microporous PVDF Films (pages 776–780)

      Xianjun Wei, Linpo Yu, Xianbo Jin, Dihua Wang and George Z. Chen

      Article first published online: 16 DEC 2008 | DOI: 10.1002/adma.200801816

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      Translucent composite films of poly(vinylidene fluoride), ionic liquid, and nickel complexes are successfully fabricated using thermal modulation of dissolution, casting, and drying. These films exhibit high stability in ambient storage and reversible thermochromic responses in air at temperatures achievable under sunlight, promising intelligent windows for controlling solar heat entering the built environment.

    5. Direct Laser Writing of Nanosized Oligofluorene Truxenes in UV-Transparent Photoresist Microstructures (pages 781–785)

      Alexander J. C. Kuehne, David Elfström, Allan R. Mackintosh, Alexander L. Kanibolotsky, Benoit Guilhabert, Erdan Gu, Igor F. Perepichka, Peter J. Skabara, Martin D. Dawson and Richard A. Pethrick

      Article first published online: 16 DEC 2008 | DOI: 10.1002/adma.200802656

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      Recently developed star-shaped nanosized oligofluorene truxenes are dispersed in a novel vinyl ether based photoresist to produce microstructures via direct laser writing. The technique offers rapid and facile production of nanostructures whithin a microstructure, and ensures environmental protection from photo-oxidation of the fluorescent molecules.

    6. Mechanically Stretching Folded Nano-π-b;-stacks Reveals Pico-Newton Attractive Forces (pages 786–789)

      Jung Sook Kim, Yu Jin Jung, Joon Won Park, Andrew D. Shaller, Wei Wan and Alexander D. Q. Li

      Article first published online: 15 DEC 2008 | DOI: 10.1002/adma.200801323

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      Picoforce atomic force microscopy (AFM) and specific DNA hybridization have been used to lock on to synthetic nano-π-stacks, revealing the secrets of thermophilic, albeit weak, π–π interactions. A cone-shaped dendron created an appropriate lateral spacing to ensure that most times a single stack was confined between the tip and the substrate, eliminating undesired multi-molecular pulling and greatly simplifying data analysis.

    7. Nanotopographic Carbon Nanotube Thin-Film Substrate Freezes Lateral Motion of Secretory Vesicles (pages 790–793)

      Jing Zhang, Dongliang Fu, Mary B. Chan-Park, Lain-Jong Li and Peng Chen

      Article first published online: 18 DEC 2008 | DOI: 10.1002/adma.200801586

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      Thin-film carbon-nanotube networks can interface with living neuroendocrine PC12 cells and support their growth and proliferation. Interestingly, as revealed by total-internal-reflection fluorescence microscopy, the nanoroughness created by the carbon-nanotube net physically deforms the 5 nm thick cell membrane with high local curvature, and significantly impedes the lateral motion of subplasmalemmal secretory vesicles.

    8. Directed Assembly of Polymer Blends Using Nanopatterned Templates (pages 794–798)

      Ming Wei, Liang Fang, Jun Lee, Sivasubramanian Somu, Xugang Xiong, Carol Barry, Ahmed Busnaina and Joey Mead

      Article first published online: 15 DEC 2008 | DOI: 10.1002/adma.200802052

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      The direct assembly of polymer blends on chemically functionalized surfaces is shown to produce a variety of nonuniform complex patterns. This method provides a powerful tool for easily producing nonuniform patterns in a rapid (30 s), one-step process with high specificity and selectivity for a variety of applications, such as nanolithography, polymeric optoelectronic devices, integrated circuits, and biosensors.

    9. Low Thresholds in Polymer Lasers on Conductive Substrates by Distributed Feedback Nanoimprinting: Progress Toward Electrically Pumped Plastic Lasers (pages 799–802)

      Ebinazar B. Namdas, Minghong Tong, Peter Ledochowitsch, Sarah R. Mednick, Jonathan D. Yuen, Daniel Moses and Alan J. Heeger

      Article first published online: 12 DEC 2008 | DOI: 10.1002/adma.200802436

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      A light-emitting transistor (LEFET) architecture with a distributed feedback (DFB) resonator structure nanoimprinted into the gain medium offers a route to achieving an electrically pumped plastic laser. A 2D DFB laser provides lower lasing thresholds than a 1D DFB laser under identical conditions. The 2D DFB lasers exhibit excellent characteristics with lasing threshold and slope efficiency of 32 nJ/pulse and 1.2%, respectively.

    10. Gram-Scale Synthesis of Cu2O Nanocubes and Subsequent Oxidation to CuO Hollow Nanostructures for Lithium-Ion Battery Anode Materials (pages 803–807)

      Ji Chan Park, Jeonghan Kim, Hyuksang Kwon and Hyunjoon Song

      Article first published online: 12 DEC 2008 | DOI: 10.1002/adma.200800596

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      A procedure for gram-scale synthesis of monodisperse Cu2O nanocubes by a simple polyol process is demonstrated. The nanocubes are subsequently oxidized to form CuO hollow cubes, spheres, and urchin-like particles, through a sequential dissolution–precipitation process. The CuO urchin-like particles exhibited excellent electrochemical performance and stability, superior to those of hollow structures, for lithium-ion battery anode materials.

    11. Nanodiamond Photoemitters Based on Strong Narrow-Band Luminescence from Silicon-Vacancy Defects (pages 808–812)

      Igor I. Vlasov, Amanda S. Barnard, Victor G. Ralchenko, Oleg I. Lebedev, Mikhail V. Kanzyuba, Alexey V. Saveliev, Vitaly I. Konov and Etienne Goovaerts

      Article first published online: 12 DEC 2008 | DOI: 10.1002/adma.200802160

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      The formation and thermodynamic stability of silicon-vacancy (Si-V) color centers, intensively emitting at a wavelength of 738 nm, are demonstrated for the first time in nanodiamonds less than 10 nm in size. These findings open prospects for the production of stable and efficient optical nanoemitters (single-photon emitters) based on nanodiamond.

    12. A Facile, Low-Cost, and Scalable Method of Selective Etching of Semiconducting Single-Walled Carbon Nanotubes by a Gas Reaction (pages 813–816)

      Hongliang Zhang, Yunqi Liu, Lingchao Cao, Dacheng Wei, Yu Wang, Hisashi Kajiura, Yongming Li, Kazuhiro Noda, Guangfu Luo, Lu Wang, Jing Zhou, Jing Lu and Zhengxiang Gao

      Article first published online: 16 DEC 2008 | DOI: 10.1002/adma.200800703

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      A facile, scalable, and low-cost gas-treatment method for selectively etching semiconductor single-walled carbon nanotubes (SWNTs) is developed. Using SO3 gas as the etchant at a temperature of 400 °C, semiconductor SWNTs can be selectively and efficiently removed, and after this gas treatment samples enriched with metallic SWNTs can be obtained.

    13. Domain Engineering for Enhanced Ferroelectric Properties of Epitaxial (001) BiFeO Thin Films (pages 817–823)

      Ho Won Jang, Daniel Ortiz, Seung-Hyub Baek, Chad M. Folkman, Rasmi R. Das, Padraic Shafer, Yanbin Chen, Christofer T. Nelson, Xiaoqing Pan, Ramamoorthy Ramesh and Chang-Beom Eom

      Article first published online: 22 JAN 2009 | DOI: 10.1002/adma.200800823

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      Two-variant stripe domains in BiFeO3 films on miscut (001) SrTiO3 substrates exhibit square-like, complete ferroelectric switching with low leakage current. Both the preferential distortion of BiFeO3 unit cells and the persistent step-flow growth induced by the substrate anisotropy are the origins of the formation of the two-variant stripe domains in (001) BiFeO3 films.

  5. Research News

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Progress Report
    5. Communications
    6. Research News
    7. Index
    1. Synthesis of Carbon-Nanotube Composites Using Supercritical Fluids and Their Potential Applications (pages 825–829)

      Zhimin Liu and Buxing Han

      Article first published online: 12 DEC 2008 | DOI: 10.1002/adma.200800609

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      Carbon nanotube (CNT) composites have attracted much interest because of their potential applications in many fields. Herein, recent advances in the synthesis of CNT composites using supercritical (SC) fluids, including SC CO2, SC-CO2-based solutions, SC water, and SC methanol, are highlighted. Particular emphasis is placed on the synthesis of metal/CNT, metal-oxide/CNT (see figure), and polymer/CNT composites.

  6. Index

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Progress Report
    5. Communications
    6. Research News
    7. Index
    1. Author Index and Subject Index Adv. Mater. 7/2009 (pages 831–832)

      Article first published online: 9 FEB 2009 | DOI: 10.1002/adma.200990024

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