Advanced Materials

Cover image for Vol. 26 Issue 14

April 9, 2014

Volume 26, Issue 14

Pages 2109–2279

  1. Cover Picture

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    6. Masthead
    7. Contents
    8. Editorial
    9. Progress Reports
    10. Reviews
    11. Communications
    12. Frontispiece
    13. Communications
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      Transparent Electrodes: Highly Conductive PEDOT:PSS Nanofibrils Induced by Solution-Processed Crystallization (Adv. Mater. 14/2014) (page 2109)

      Nara Kim, Seyoung Kee, Seoung Ho Lee, Byoung Hoon Lee, Yung Ho Kahng, Yong-Ryun Jo, Bong-Joong Kim and Kwanghee Lee

      Article first published online: 4 APR 2014 | DOI: 10.1002/adma.201470088

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      The crystalline nanostructure of intrinsically conducting polymers is formed via an all-solution process, leading to a highly conducting state. H2SO4 post-treatment induces a significant structural rearrangement in PEDOT:PSS films, developing crystalline nanofibrils with a stoichiometrically optimal amount of PSS, and this dramatically increases conductivity up to σdc ≈ 4380 S cm−1. The highly conductive PEDOT:PSS exhibits potential as a transparent electrode in printable optoelectronic devices, as described by K. Lee, S. H. Lee, and co-workers on page 2268.

  2. Inside Front Cover

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    11. Communications
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      Photoelectrodes: Highly Efficient Capillary Photoelectrochemical Water Splitting Using Cellulose Nanofiber-Templated TiO2 Photoanodes (Adv. Mater. 14/2014) (page 2110)

      Zhaodong Li, Chunhua Yao, Yanhao Yu, Zhiyong Cai and Xudong Wang

      Article first published online: 4 APR 2014 | DOI: 10.1002/adma.201470089

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      X. D. Wang, Z. Cai, and co-workers demonstrate on page 2262 a cellulose-nanofiber (CNF)-enabled capillary photo-electrochemical (PEC) photoanode for performing water-splitting reactions outside of the electrolyte body, mimicking the water-transmission process in plants. Driven by the capillary force, the electrolyte transmits through the nano-/microchannels in the CNF film and reaches the photocatalyst sites. Enhanced reaction kinetics and higher efficiency can be achieved by the capillary PEC process.

  3. Inside Back Cover

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      Supercapacitors: Carbons and Electrolytes for Advanced Supercapacitors (Adv. Mater. 14/2014) (page 2283)

      François Béguin, Volker Presser, Andrea Balducci and Elzbieta Frackowiak

      Article first published online: 4 APR 2014 | DOI: 10.1002/adma.201470093

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      Electrical-energy storage has become one of the most critical areas of technological research. Electrochemical capacitors, also known as supercapacitors or ultracapacitors, are devices for rapid and highly efficient energy storage via interfacial ion electrosorption and fast redox reactions. F. Béguin and co-workers summarize on page 2219 the state of the art on carbon materials and electrolytes used in this technology and present current and foreshadowing developments in a comprehensive review article.

  4. Back Cover

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      Electrodes: Engraving Copper Foil to Give Large-Scale Binder-Free Porous CuO Arrays for a High-Performance Sodium-Ion Battery Anode (Adv. Mater. 14/2014) (page 2284)

      Shuang Yuan, Xiao-lei Huang, De-long Ma, Heng-guo Wang, Fan-zhi Meng and Xin-bo Zhang

      Article first published online: 4 APR 2014 | DOI: 10.1002/adma.201470094

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      X.-B. Zhang and co-workers report on page 2273 aligned porous CuO nanorod arrays obtained by a facile and scalable in situ engraving Cu foil method. When directly used as a flexible and binder-free sodium-ion battery anode without adding auxiliary materials, a superior electrochemical performance, including cycle stability and rate capability even at room temperature, are obtained. This can be attributed to the unique array structure and the binder-free electrode.

  5. Masthead

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    1. Masthead: (Adv. Mater. 14/2014)

      Article first published online: 4 APR 2014 | DOI: 10.1002/adma.201470091

  6. Contents

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    1. Contents: (Adv. Mater. 14/2014) (pages 2111–2115)

      Article first published online: 4 APR 2014 | DOI: 10.1002/adma.201470090

  7. Editorial

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  8. Progress Reports

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    13. Communications
    1. 25th Anniversary Article: High-Mobility Hole and Electron Transport Conjugated Polymers: How Structure Defines Function (pages 2119–2136)

      Yoann Olivier, Dorota Niedzialek, Vincent Lemaur, Wojciech Pisula, Klaus Müllen, Unsal Koldemir, John R. Reynolds, Roberto Lazzaroni, Jérôme Cornil and David Beljonne

      Article first published online: 5 MAR 2014 | DOI: 10.1002/adma.201305809

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      By means of combined computational tools based on molecular mechanics/dynamics and quantum-chemistry, the relationships between the chemical structure and the supramolecular organization of p- and n-type p-conjugated polymers are highlighted and the implications for charge transport are discussed. Specifically, the crucial role of the alkyl side chains in driving a structural organization that favors high hole and/or electron mobility is emphasized.

  9. Reviews

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    13. Communications
    1. 25th Anniversary Article: Semiconductor Nanowires – Synthesis, Characterization, and Applications (pages 2137–2184)

      Neil P. Dasgupta, Jianwei Sun, Chong Liu, Sarah Brittman, Sean C. Andrews, Jongwoo Lim, Hanwei Gao, Ruoxue Yan and Peidong Yang

      Article first published online: 6 MAR 2014 | DOI: 10.1002/adma.201305929

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      Semiconductor nanowires have been studied extensively for their novel electronic, photonic, thermal, electrochemical and mechanical properties. This comprehensive review summarizes major advances in the synthesis, characterization, and application of these materials in the past decade. Developments in nanowire synthesis are presented, followed by the application of nanowires in electronic, sensor, photonic, thermoelectric, photo­voltaic, photoelectrochemical, battery, mechanical, and biological applications.

    2. 25th Anniversary Article: Hybrid Nanostructures Based on Two-Dimensional Nanomaterials (pages 2185–2204)

      Xiao Huang, Chaoliang Tan, Zongyou Yin and Hua Zhang

      Article first published online: 10 MAR 2014 | DOI: 10.1002/adma.201304964

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      Two-dimensional (2D) nanomaterials, such as graphene and transition metal dichalcogenides (TMDs), receive a lot of attention due to their attractive properties and wide applications. Their performance can be further enhanced by the formation of hybrid structures with other functional materials. In this review, the latest studies in 2D nanomaterial-based hybrid nanostructures are discussed, focusing on their preparation methods, properties, and applications.

    3. 25th Anniversary Article: Double Emulsion Templated Solid Microcapsules: Mechanics And Controlled Release (pages 2205–2218)

      Sujit S. Datta, Alireza Abbaspourrad, Esther Amstad, Jing Fan, Shin-Hyun Kim, Mark Romanowsky, Ho Cheung Shum, Bingjie Sun, Andrew S. Utada, Maike Windbergs, Shaobing Zhou and David A. Weitz

      Article first published online: 24 FEB 2014 | DOI: 10.1002/adma.201305119

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      Recent developments in fabricating and characterizing solid-shelled microcapsules using microfluidically generated double emulsion templates are highlighted. This approach enables the design of microcapsules with release behavior tailored for specific applications.

    4. Carbons and Electrolytes for Advanced Supercapacitors (pages 2219–2251)

      François Béguin, Volker Presser, Andrea Balducci and Elzbieta Frackowiak

      Article first published online: 3 FEB 2014 | DOI: 10.1002/adma.201304137

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      Electrochemical capacitors, also known as supercapacitors, are devices for highly efficient energy storage and recovery. This review summarizes the science and technology of carbon supercapacitors, especially regarding the relation between ion size/ion desolvation and the pore size of electrically charged porous carbon materials. Using pseudocapacitive materials and employing electrolytes that allow applying very high cell voltages are presented as two strategies to improve the energy density.

  10. Communications

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    1. Light-Directed Electrophoretic Deposition: A New Additive Manufacturing Technique for Arbitrarily Patterned 3D Composites (pages 2252–2256)

      Andrew J. Pascall, Fang Qian, Gongming Wang, Marcus A. Worsley, Yat Li and Joshua D. Kuntz

      Article first published online: 14 FEB 2014 | DOI: 10.1002/adma.201304953

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      A versatile, new additive manufacturing technique based on electrophoretic deposition of colloids onto light-patterned photoelectrodes is demonstrated. Particles to be deposited move via electrophoresis and adhere to the illuminated regions of the electrode. This process is repeated with different materials and illumination patterns to fabricate arbitrarily patterned 3D multimaterial composites.

  11. Frontispiece

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      Nanoparticles: “Hyper-bright” Near-Infrared Emitting Fluorescent Organic Nanoparticles for Single Particle Tracking (Adv. Mater. 14/2014) (page 2257)

      Emilie Genin, Zhenghong Gao, Juan A. Varela, Jonathan Daniel, Talia Bsaibess, Isabelle Gosse, Laurent Groc, Laurent Cognet and Mireille Blanchard-Desce

      Article first published online: 4 APR 2014 | DOI: 10.1002/adma.201470092

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      Novel near-IR emitting luminescent nanoparticles made only from organic molecules are designed from a totally bottom-up route and prepared via a simple and efficacious route as described by M. Blanchard-Desce, L. Cognet, and co-workers on page 2258. These biocompatible near-IR emitting nanoparticles (named HIFONS), which combine excellent chemical and colloidal stability and exhibit outstanding brightness, have been successfully imaged at single-particle level into saline and cellular environments. As such, these fully organic nanoparticles pave the way towards new tools in bio-nanotechnologies.

  12. Communications

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    1. “Hyper-bright” Near-Infrared Emitting Fluorescent Organic Nanoparticles for Single Particle Tracking (pages 2258–2261)

      Emilie Genin, Zhenghong Gao, Juan A. Varela, Jonathan Daniel, Talia Bsaibess, Isabelle Gosse, Laurent Groc, Laurent Cognet and Mireille Blanchard-Desce

      Article first published online: 3 FEB 2014 | DOI: 10.1002/adma.201304602

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      An efficacious strategy to obtain photostable hyper-bright near-IR emitting fluorescent organic nanoparticles (HIFONs) is reported. These HIFONs show excellent chemical and colloidal stability and retain their pristine nanostructure and brightness after incubation in cellular environments. They can be identified at the single particle level with a wide-field microscope, emerging as highly promising tools for applications in bio-nanotechnologies.

    2. Highly Efficient Capillary Photoelectrochemical Water Splitting Using Cellulose Nanofiber-Templated TiO2 Photoanodes (pages 2262–2267)

      Zhaodong Li, Chunhua Yao, Yanhao Yu, Zhiyong Cai and Xudong Wang

      Article first published online: 24 FEB 2014 | DOI: 10.1002/adma.201303369

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      A capillary photoelectrochemical (PEC) system  is developed using cellulose-nanofiber (CNF)-templated TiO2 nanostructures to perform water splitting reactions outside of the electrolyte body, where the electrolyte is supplied through capillary force-driven nano/micro-channels in the CNF film. Enhanced reaction kinetics and higher efficiencies are observed in the capillary PEC process compared with conventional in-electrolyte PEC setups.

    3. Highly Conductive PEDOT:PSS Nanofibrils Induced by Solution-Processed Crystallization (pages 2268–2272)

      Nara Kim, Seyoung Kee, Seoung Ho Lee, Byoung Hoon Lee, Yung Ho Kahng, Yong-Ryun Jo, Bong-Joong Kim and Kwanghee Lee

      Article first published online: 16 DEC 2013 | DOI: 10.1002/adma.201304611

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      Crystalline poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) nanofibrils with an electrical conductivity of 4380 S cm-1 are formed via a solution process using H2SO4. The concentrated H2SO4 treatment induces a significant structural rearrangement of the PEDOT:PSS via a charge-separated transition mechanism, resulting in highly ordered and densely packed PEDOT:PSS nanofibrils. The PEDOT:PSS electrode shows a sheet resistance of 46 Ω sq-1 with 90% optical transmittance.

    4. Engraving Copper Foil to Give Large-Scale Binder-Free Porous CuO Arrays for a High-Performance Sodium-Ion Battery Anode (pages 2273–2279)

      Shuang Yuan, Xiao-lei Huang, De-long Ma, Heng-guo Wang, Fan-zhi Meng and Xin-bo Zhang

      Article first published online: 20 JAN 2014 | DOI: 10.1002/adma.201304469

      Thumbnail image of graphical abstract

      Arrays of aligned porous CuO nanorods are obtained by a facile and scalable method of engraving Cu foil in situ. Direct use of the arrays as a flexible and binder-free sodium-ion battery anode — without adding auxiliary materials — results in superior electrochemical performance, including cycle stability and rate capability, even at room temperature. This can be attributed to the unique array structure and the lack of binder in the electrode.

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