Advanced Functional Materials

Cover image for Vol. 24 Issue 3

January 22, 2014

Volume 24, Issue 3

Pages 269–411

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    4. Masthead
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      LEDs: Quasi-2D Colloidal Semiconductor Nanoplatelets for Narrow Electroluminescence (Adv. Funct. Mater. 3/2014) (page 269)

      Zhuoying Chen, Brice Nadal, Benoit Mahler, Hervé Aubin and Benoit Dubertret

      Version of Record online: 16 JAN 2014 | DOI: 10.1002/adfm.201470015

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      In the search for better-performing colloidal lightemitting diodes (LEDs), nanocrystals of anisotropic morphologies remain to be explored. On page 295, Z. Chen et al. present the first functional LEDs based on quasi-2D core/shell CdSe/CdZnS nanoplatelets, where quantum confinement takes place in the direction of thickness. These solution-processed hybrid LEDs exhibit extremely narrow electroluminescence under different driving voltages, which is highly promising to achieve superior color purity.

  2. Inside Front Cover

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      Dye-Sensitized Solar Cells: High Efficiency Solid-State Dye-Sensitized Solar Cells Assembled with Hierarchical Anatase Pine Tree-like TiO2 Nanotubes (Adv. Funct. Mater. 3/2014) (page 270)

      Dong Kyu Roh, Won Seok Chi, Harim Jeon, Sang Jin Kim and Jong Hak Kim

      Version of Record online: 16 JAN 2014 | DOI: 10.1002/adfm.201470016

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      J. H. Kim and co-workers present a facile and effective method to prepare hierarchical pine treelike TiO2 nanotube arrays with an anatase phase directly grown onto a transparent conducting oxide substrate via a one-step hydrothermal reaction. On page 379, the length of the nanotube arrays is increased by up to 19 μm to significantly improve the specific surface area and charge transport in dye-sensitized solar cells.

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      Masthead: (Adv. Funct. Mater. 3/2014)

      Version of Record online: 16 JAN 2014 | DOI: 10.1002/adfm.201470019

  4. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
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  5. Frontispiece

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    4. Masthead
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      Microstructures: Femto-Second Laser-Based Free Writing of 3D Protein Microstructures and Micropatterns with Sub-Micrometer Features: A Study on Voxels, Porosity, and Cytocompatibility (Adv. Funct. Mater. 3/2014) (page 276)

      Barbara Pui Chan, Jiao Ni Ma, Jin Ye Xu, Chuen Wai Li, Jin Ping Cheng and Shuk Han Cheng

      Version of Record online: 16 JAN 2014 | DOI: 10.1002/adfm.201470018

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      Fibroblasts are shown here pulling on a protein micropillar array. On page 277, B. P. Chan et al. show such complex protein microstructures and micropatterns can be fabricated using multiphoton-based free-writing, via the expression of specific adhesion molecules. This protein micropillar array presents a simple “write-and-seed” platform for cell niche studies.

  6. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Frontispiece
    7. Full Papers
    1. Femto-Second Laser-Based Free Writing of 3D Protein Microstructures and Micropatterns with Sub-Micrometer Features: A Study on Voxels, Porosity, and Cytocompatibility (pages 277–294)

      Barbara Pui Chan, Jiao Ni Ma, Jin Ye Xu, Chuen Wai Li, Jin Ping Cheng and Shuk Han Cheng

      Version of Record online: 16 JUL 2013 | DOI: 10.1002/adfm.201300709

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      Multiphoton-based free-writing of 3D complex protein microstructures and micropatterns, with sub-micrometer features and controllability over voxel dimension, morphology, and porosity, is reported. Protein micropillar array presents a simple “write-and-seed” platform for cell niche studies. Fibroblasts attach to, grow on, express adhesion molecules and deposit extracellular matrices on these arrays without matrix coating.

    2. Quasi-2D Colloidal Semiconductor Nanoplatelets for Narrow Electroluminescence (pages 295–302)

      Zhuoying Chen, Brice Nadal, Benoit Mahler, Hervé Aubin and Benoit Dubertret

      Version of Record online: 16 JUL 2013 | DOI: 10.1002/adfm.201301711

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      The first light-emitting diodes (LEDs) based on quasi-2D colloidal core/shell CdSe/CdZnS nanoplatelets (NPLs) under a solution-processed hybrid device structure are reported. Over different applied voltages, systematically narrow electroluminescence of FWHM in the range of 25–30 nm is observed, which is highly attractive in terms of color purity in the context of LED applications.

    3. Ruthenium Oxide Hydrogen Evolution Catalysis on Composite Cuprous Oxide Water-Splitting Photocathodes (pages 303–311)

      S. David Tilley, Marcel Schreier, João Azevedo, Morgan Stefik and Michael Graetzel

      Version of Record online: 16 JUL 2013 | DOI: 10.1002/adfm.201301106

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      Ruthenium oxide on cuprous oxide photocathodes enhanced by a built-in p–n junction yields an active catalyst for hydrogen generation from water and unprecedented 94% stability over 8 h of light chopping chronoamperometry at 0 V vs. the reversible hydrogen electrode. The photocurrents obtained would correspond to greater than 6% solar-to-hydrogen efficiency in a tandem cell configuration.

    4. Size-Dependent Staging and Phase Transition in LiFePO4/FePO4 (pages 312–318)

      Changbao Zhu, Lin Gu, Liumin Suo, Jelena Popovic, Hong Li, Yuichi Ikuhara and Joachim Maier

      Version of Record online: 23 SEP 2013 | DOI: 10.1002/adfm.201301792

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      The phenomenon of Li-ordering in the system LiFePO4/FePO4 is investigated by STEM-ABF for different sizes. While in small crystals, the ordering affect the whole particle; for larger crystals, it was found to characterize the LiFePO4/FePO4 contact and the interfacial zones narrow with increasing size. These findings are discussed in the light of phase transition thermodynamics and kinetics.

    5. Fe3O4 Nanoparticles Embedded in Uniform Mesoporous Carbon Spheres for Superior High-Rate Battery Applications (pages 319–326)

      Yu Chen, Bohang Song, Meng Li, Li Lu and Junmin Xue

      Version of Record online: 1 AUG 2013 | DOI: 10.1002/adfm.201300872

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      Robust composite structures consisting of Fe3O4 nanoparticles (∼5 nm) embedded in uniform mesoporous carbon spheres with an average size of about 70 nm (IONP@mC) are synthesized with the purpose of application in high-rate batteries. Under high current densities ranging from 500 to 10 000 mA g−1 such composites deliver stable and high reversible capacities reaching 271 mAh g−1 at 10 000 mA g−1.

    6. Biopolymer Templated Glass with a Twist: Controlling the Chirality, Porosity, and Photonic Properties of Silica with Cellulose Nanocrystals (pages 327–338)

      Kevin E. Shopsowitz, Joel A. Kelly, Wadood Y. Hamad and Mark J. MacLachlan

      Version of Record online: 2 AUG 2013 | DOI: 10.1002/adfm.201301737

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      A detailed investigation of the formation and properties of chiral nematic mesoporous silica (CNMS) templated by cellulose nanocrystals is presented. These materials are made by a simple self-assembly process and have tunable chirality, mesoporosity, and photonic properties. The chiral pore structure of these materials may provide unique opportunities for applications including refractometric sensing.

    7. Realistic Detailed Balance Study of the Quantum Efficiency of Quantum Dot Solar Cells (pages 339–345)

      Alexander Mellor, Antonio Luque, Ignacio Tobías and Antonio Martí

      Version of Record online: 5 AUG 2013 | DOI: 10.1002/adfm.201301513

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      A model is developed to calculate the intersubband (blue arrow) and intrasubband (red arrows) photocurrents in an InAs/GaAs quantum dot solar cell. Temperature-dependent quantum efficiency measurements are reproduced with good agreement. The results reveal the radiative nature of the thermal escape from the quantum dots, and explain the difficulty in measuring intrasubband transitions.

    8. A Shape-Adaptive, Antibacterial-Coating of Immobilized Quaternary-Ammonium Compounds Tethered on Hyperbranched Polyurea and its Mechanism of Action (pages 346–355)

      Lia A. T. W. Asri, Mihaela Crismaru, Steven Roest, Yun Chen, Oleksii Ivashenko, Petra Rudolf, Joerg C. Tiller, Henny C. van der Mei, Ton J. A. Loontjens and Henk J. Busscher

      Version of Record online: 8 AUG 2013 | DOI: 10.1002/adfm.201301686

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      Shape-adaptive, hyperbranched polyurea with quaternary ammonium compounds. The preparation of AB2 monomers and the covalently attached hyperbranched polyurea coatings with polyethyleneimine covalently coupled to hyperbranched polyurea coatings. The coatings demonstrate high contact-killing efficacies toward adhering staphylococci, without any demonstrable leaching of antibacterial compounds.

    9. Relaxor/Ferroelectric Composites: A Solution in the Quest for Practically Viable Lead-Free Incipient Piezoceramics (pages 356–362)

      Claudia Groh, Daniel J. Franzbach, Wook Jo, Kyle G. Webber, Jens Kling, Ljubomira A. Schmitt, Hans-Joachim Kleebe, Soon-Jong Jeong, Jae-Shin Lee and Jürgen Rödel

      Version of Record online: 6 SEP 2013 | DOI: 10.1002/adfm.201302102

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      Incipient piezoceramics are featured by giant strain of ≈0.4%. However, this giant strain is only realized at relatively large electric field (>4 KV mm−1) with a significant strain hysteresis. Here, many of the challenges the incipient piezoceramics face can be overcome by relaxor/ferroelectric composite approach.

    10. Near-Infrared Photoregulated Drug Release in Living Tumor Tissue via Yolk-Shell Upconversion Nanocages (pages 363–371)

      Lingzhi Zhao, Juanjuan Peng, Qi Huang, Chunyan Li, Min Chen, Yun Sun, Qiuning Lin, Linyong Zhu and Fuyou Li

      Version of Record online: 4 SEP 2013 | DOI: 10.1002/adfm.201302133

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      A near-infrared (NIR) phototrigger-controlled drug-release device (PDD) is designed using yolk-shell structured nanocages with upconversion nanophosphors as yolks and silica as shells (YSUCNP). The anticancer drug chlorambucil caged with a coumarin phototrigger is accommodated by YSUCNPs to a large loading capacity of 49 wt%. By employing NIR light with deep tissue penetration depth as stimuli, the PDD demonstrates efficacy in living tumor-bearing mice with zero premature release.

    11. Enhanced Hydrogen Production by Photoreforming of Renewable Oxygenates Through Nanostructured Fe2O3 Polymorphs (pages 372–378)

      Giorgio Carraro, Chiara Maccato, Alberto Gasparotto, Tiziano Montini, Stuart Turner, Oleg I. Lebedev, Valentina Gombac, Gianpiero Adami, Gustaaf Van Tendeloo, Davide Barreca and Paolo Fornasiero

      Version of Record online: 16 SEP 2013 | DOI: 10.1002/adfm.201302043

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      Sunlight-activated photoreforming of renewable oxygenates promoted by Fe2O3 nanosystems is a very attractive process for hydrogen production. In this context, scarcely investigated β- and ε-Fe2O3 polymorphs, fabricated by chemical vapor deposition, show very promising performances for photocatalytic solar hydrogen generation. The present approach holds a remarkable potential even for the synthesis of added-value by-products, paving the way to manifold technological applications.

    12. High Efficiency Solid-State Dye-Sensitized Solar Cells Assembled with Hierarchical Anatase Pine Tree-like TiO2 Nanotubes (pages 379–386)

      Dong Kyu Roh, Won Seok Chi, Harim Jeon, Sang Jin Kim and Jong Hak Kim

      Version of Record online: 31 JUL 2013 | DOI: 10.1002/adfm.201301562

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      Hierarchical, 19 μm long, anatase, pine tree-like TiO2 nanotube arrays directly grown on a transparent conducting oxide via a one-step hydrothermal reaction result in high-efficiency, solid-state dye-sensitized solar cells. The efficiency is 8.0% at 100 mW/cm2, one of the highest values observed for the N719 dye.

    13. Saturated Polar-Substituted Polyethylene Elastomers from Insertion Polymerization (pages 387–395)

      Thomas Rünzi and Stefan Mecking

      Version of Record online: 21 AUG 2013 | DOI: 10.1002/adfm.201301755

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      Saturated polar-substituted elastomers are obtained via functional-group tolerant catalytic insertion polymerization. This novel direct approach to hydrocarbon- and oil-resistant elastomers is compatible with a wide range of cross-linking chemistries, which results in useful mechanical and thermal properties as well as solvent-resistance.

    14. Interfacial Sliding and Buckling of Monolayer Graphene on a Stretchable Substrate (pages 396–402)

      Tao Jiang, Rui Huang and Yong Zhu

      Version of Record online: 1 AUG 2013 | DOI: 10.1002/adfm.201301999

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      The mechanical response of monolayer graphene on polyethylene terephthalate is characterized using in-situ Raman spectroscopy and atomic force microscopy. Two interfacial failure mechanisms, shear sliding under tension and buckling under compression, are identified. The interfacial shear strength is found to range between 0.46 and 0.69 MPa. Beyond a critical compressive strain of around −0.7%, buckling ridges are observed.

    15. Optically Transparent Antibacterial Films Capable of Healing Multiple Scratches (pages 403–411)

      Xu Wang, Yan Wang, Shuai Bi, Yongguo Wang, Xigao Chen, Lingying Qiu and Junqi Sun

      Version of Record online: 13 AUG 2013 | DOI: 10.1002/adfm.201302109

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      Optically transparent antibacterial films capable of healing scratches to restore transparency are fabricated by incorporating triclosan into branched polyethylenimine/poly(acrylic acid) multilayer films. Sustained release of triclosan endows the films with antibacterial properties. Film transparency can be healed multiple times by immersing the films in water or spraying water on them.

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