Advanced Functional Materials

Cover image for Vol. 23 Issue 19

May 20, 2013

Volume 23, Issue 19

Pages 2341–2458

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      Energy Harvesting Materials: Super-Flexible Nanogenerator for Energy Harvesting from Gentle Wind and as an Active Deformation Sensor (Adv. Funct. Mater. 19/2013) (page 2341)

      Sangmin Lee, Sung-Hwan Bae, Long Lin, Ya Yang, Chan Park, Sang-Woo Kim, Seung Nam Cha, Hyunjin Kim, Young Jun Park and Zhong Lin Wang

      Version of Record online: 13 MAY 2013 | DOI: 10.1002/adfm.201370091

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      To construct super-flexible and conformable nanogenerators, ZnO nanowires are grown on 18-μm-thick Al foil, which is used as both the electrode and the substrate. Coating the Al foil with poly(methyl methacrylate) before the growth of ZnO nanowires results in a high-throughput process due to complete insulation between the as-grown ZnO nanowires and the Al foil. As reported by Zhong Lin Wang and co-workers on page 2445, this super-flexible nanogenerator shows potential as an energy harvester from a waving flag and as a self-powered sensor for detecting skin movement.

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      Sensors: Thin-Wall Assembled SnO2 Fibers Functionalized by Catalytic Pt Nanoparticles and their Superior Exhaled-Breath-Sensing Properties for the Diagnosis of Diabetes (Adv. Funct. Mater. 19/2013) (page 2342)

      Jungwoo Shin, Seon-Jin Choi, Inkun Lee, Doo-Young Youn, Chong Ook Park, Jong-Heun Lee, Harry L. Tuller and Il-Doo Kim

      Version of Record online: 13 MAY 2013 | DOI: 10.1002/adfm.201370092

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      Thin-wall assembled SnO2 tubes with a number elongated pores are synthesized via electrospinning, controlled by the variation of flow rates. On page 2357, Il-Doo Kim and co-workers report that these highly porous SnO2 tubes show a five-fold higher acetone response compared with dense SnO2 fiber in a humid atmosphere that is similar to the oral cavity. The accurate detection of acetone gas in exhaled breath can provide useful information for real-time diagnosis of diabetes.

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      Masthead: (Adv. Funct. Mater. 19/2013)

      Version of Record online: 13 MAY 2013 | DOI: 10.1002/adfm.201370093

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    1. Anion-Doped Mixed Metal Oxide Nanostructures Derived from Layered Double Hydroxide as Visible Light Photocatalysts (pages 2348–2356)

      Seungho Cho, Ji-Wook Jang, Ki-jeong Kong, Eun Sun Kim, Kun-Hong Lee and Jae Sung Lee

      Version of Record online: 16 DEC 2012 | DOI: 10.1002/adfm.201201883

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      The interlayer gallery of layered double hydroxides allows effective access of anion precursors to their crystal lattice for uniform carbon and nitrogen doping, which yields anion-doped mixed metal oxide nanostructures with an excellent visible light photocatalytic activity. The visible light absorption caused by the anion doping contributes to the photocatalytic activity.

    2. Thin-Wall Assembled SnO2 Fibers Functionalized by Catalytic Pt Nanoparticles and their Superior Exhaled-Breath-Sensing Properties for the Diagnosis of Diabetes (pages 2357–2367)

      Jungwoo Shin, Seon-Jin Choi, Inkun Lee, Doo-Young Youn, Chong Ook Park, Jong-Heun Lee, Harry L. Tuller and Il-Doo Kim

      Version of Record online: 13 DEC 2012 | DOI: 10.1002/adfm.201202729

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      Electrospun fibers with wrinkled SnO2 walls composed of a number of elongated openings and pores are synthesized by a microphase separation controlled by the variation of flow rates. The unique structure enables superior acetone sensing performance due to the open pore structure, which provides fast transport and penetration of exhaled gases into the entire sensing layers.

    3. One-Step Macroscopic Alignment of Conjugated Polymer Systems by Epitaxial Crystallization during Spin-Coating (pages 2368–2377)

      Christian Müller, Mahdieh Aghamohammadi, Scott Himmelberger, Prashant Sonar, Miquel Garriga, Alberto Salleo and Mariano Campoy-Quiles

      Version of Record online: 3 JAN 2013 | DOI: 10.1002/adfm.201202983

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      Macroscopic spherulite-like structures of the conjugated polymer poly(3-hexylthiophene) (P3HT) grow directly during spin-coating. This is achieved by processing P3HT or P3HT:fullerene bulk heterojunction blends from a mixture of the crystallizable solvent 1,3,5-trichlorobenzene and a second carrier solvent such as chlorobenzene. Epitaxial growth of the polymer on solidified solvent crystals gives rise to circular-symmetric, spherulite-like structures that feature a high degree of anisotropy.

    4. Tunable Magnonic Spectra in Two-Dimensional Magnonic Crystals with Variable Lattice Symmetry (pages 2378–2386)

      Susmita Saha, Ruma Mandal, Saswati Barman, Dheeraj Kumar, Bivas Rana, Yasuhiro Fukuma, Satoshi Sugimoto, YoshiChika Otani and Anjan Barman

      Version of Record online: 17 DEC 2012 | DOI: 10.1002/adfm.201202545

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      Tunable magnonic spectra in two-dimensional magnonic crystals with variable lattice symmetry are studied using an all-optical time-resolved magneto-optical Kerr microscope. The magnonic mode profiles are interpreted in different lattices by micromagnetic simulations. A six-fold anisotropy is observed in the hexagonal lattice due to the variation of the magnetostatic stray field on the elements.

    5. Dendron-Stabilized Liquid Crystalline Blue Phases with an Enlarged Controllable Range of the Photonic Band for Tunable Photonic Devices (pages 2387–2396)

      Seishi Shibayama, Hiroki Higuchi, Yasushi Okumura and Hirotsugu Kikuchi

      Version of Record online: 27 DEC 2012 | DOI: 10.1002/adfm.201202497

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      Liquid crystalline blue phases have great potential for advanced applications in tunable photonic devices. A new material system is developed with a dendron molecule, simultaneously enabling both the enlargement of the temperature range of thermodynamically stable blue phases and the continuously reversible maximum shift range of Bragg reflection in a visible wavelength region under an electric field.

    6. Engineering of Graphene Layer Orientation to Attain High Rate Capability and Anisotropic Properties in Li-Ion Battery Electrodes (pages 2397–2404)

      Amartya Mukhopadhyay, Fei Guo, Anton Tokranov, Xingcheng Xiao, Robert H. Hurt and Brian W. Sheldon

      Version of Record online: 6 JAN 2013 | DOI: 10.1002/adfm.201201128

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      Engineering of graphene layer orientations to obtain vertically aligned graphene layer based thin-film electrodes (a-axis oriented graphitic carbon film) for Li-ion batteries leads to considerably improved specific capacity at higher electrochemical cycling rates (improved rate capability), as compared to the more usual c-axis oriented graphitic carbon films.

  6. Frontispiece

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      Nanotube Arrays: In Situ Generated Gas Bubble-Directed Self-Assembly: Synthesis, and Peculiar Magnetic and Electrochemical Properties of Vertically Aligned Arrays of High-Density Co3O4 Nanotubes (Adv. Funct. Mater. 19/2013) (page 2405)

      Guoxiu Tong, Jianguo Guan and Qingjie Zhang

      Version of Record online: 13 MAY 2013 | DOI: 10.1002/adfm.201370095

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      The simple, versatile, and large-scale fabrication of vertically aligned nanotube arrays (NTAs) is achieved by regulating the gas bubbles in situ generated from the thermal decomposition of melted salts. On page 2406, Jianguo Guan and co-workers report that as-obtained Co3O4 NTAs show unique magnetic properties and significantly enhanced electrochemical activity, and are promising for magnetic recording media, magnetic shielding, lithium-ion batteries, and chemical sensing.

  7. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
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    8. Full Papers
    1. In Situ Generated Gas Bubble-Directed Self-Assembly: Synthesis, and Peculiar Magnetic and Electrochemical Properties of Vertically Aligned Arrays of High-Density Co3O4 Nanotubes (pages 2406–2414)

      Guoxiu Tong, Jianguo Guan and Qingjie Zhang

      Version of Record online: 10 DEC 2012 | DOI: 10.1002/adfm.201202747

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      A versatile gas bubble-induced self-assembly technique based on thermal decomposition of Co(NO3)2·6H2O on a flat substrate is developed for the novel one-step fabrication of vertically aligned arrays of Co3O4 nanotubes, which show unique magnetic properties and enhanced electrochemical activity, and thus have promising applications in magnetic shielding, energy storage, etc.

    2. Arsonic Acid Self-Assembled Monolayers Protect Oxide Surfaces from Micronewton Nanomechanical Forces (pages 2415–2421)

      Natalie A. LaFranzo and Joshua A. Maurer

      Version of Record online: 6 DEC 2012 | DOI: 10.1002/adfm.201202566

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      Hexadecylarsonic acid self-assembled monolayers are prepared on glass, silicon oxide, and titanium oxide via a straight-forward soaking method. These monolayers protect the substrates from micronewton mechanical forces applied in scanning probe microscopy nanoscratching experiments. Compared to hexadecylphosphonic acid, the arsonate shows increased reactivity and greater protection of the substrate from mechanical stress. This system shows excellent potential as a microelectromechanical systems (MEMS) lubricant.

    3. Highly Stable Graphene-Based Multilayer Films Immobilized via Covalent Bonds and Their Applications in Organic Field-Effect Transistors (pages 2422–2435)

      Xiaowei Ou, Lang Jiang, Penglei Chen, Mingshan Zhu, Wenping Hu, Minghua Liu, Junfa Zhu and Huanxin Ju

      Version of Record online: 6 DEC 2012 | DOI: 10.1002/adfm.201202586

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      Highly stable graphene-based multilayers films are covalently immobilized on solid supports. Compared with those formulated through a noncovalent-based method, the as-constructed covalent-based multilayered films display much higher stability and reproducibility, suggesting a bright future for practical applications that require withstanding of multistep post-production processes. The application of the covalent graphene-based films as source/drain electrodes in organic field-effect transistors is investigated.

    4. Reconstruction of Conformal Nanoscale MnO on Graphene as a High-Capacity and Long-Life Anode Material for Lithium Ion Batteries (pages 2436–2444)

      Yongming Sun, Xianluo Hu, Wei Luo, Fangfang Xia and Yunhui Huang

      Version of Record online: 10 DEC 2012 | DOI: 10.1002/adfm.201202623

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      A facile strategy is explored to prepare a hybrid material consisting of MnO nanocrystals grown on conductive graphene nanosheets. A long-term stable nanoarchitecture of graphene-supported ultrafine manganese oxide nanoparticles is formed upon cycling, which yields a high-capacity and long-life anode material for lithium ion batteries.

    5. Super-Flexible Nanogenerator for Energy Harvesting from Gentle Wind and as an Active Deformation Sensor (pages 2445–2449)

      Sangmin Lee, Sung-Hwan Bae, Long Lin, Ya Yang, Chan Park, Sang-Woo Kim, Seung Nam Cha, Hyunjin Kim, Young Jun Park and Zhong Lin Wang

      Version of Record online: 13 DEC 2012 | DOI: 10.1002/adfm.201202867

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      A super-flexible and conformable piezoelectric nanogenerator (NG) based on cost-effective Al foil is invented. The super-flexible NG can generate output power in light air and serve as an energy harvesting device under the waving motion of an attached flag due to its excellent conformability. The NGs show potential applications as active sensors that are capable of detecting slight skin movement due to their extremely low resistance to motion. This is a highly promising platform to produce energy harvesting devices and self-powered sensors.

    6. Superparamagnetic Ag@Co-Nanocomposites on Granulated Cation Exchange Polymeric Matrices with Enhanced Antibacterial Activity for the Environmentally Safe Purification of Water (pages 2450–2458)

      Amanda Alonso, Xavier Muñoz-Berbel, Núria Vigués, Rosalía Rodríguez-Rodríguez, Jorge Macanás, Maria Muñoz, Jordi Mas and Dmitri N. Muraviev

      Version of Record online: 7 DEC 2012 | DOI: 10.1002/adfm.201202663

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      Ag@Co-nanocomposites with a low cost magnetic Co core and an antibacterial Ag shell, which preserves the core integrity, are fabricated on granulated cation exchange polymeric matrices by intermatrix synthesis under soft reaction conditions. These materials present as superparamagnetic and have enhanced antibacterial activity, making them ideal for water purification applications.

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