Advanced Materials

Cover image for Vol. 25 Issue 24

June 25, 2013

Volume 25, Issue 24

Pages 3257–3385

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Review
    8. Communication
    9. Frontispiece
    10. Communications
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      Self-Organization: Self-Organization of Multifunctional Surfaces – The Fingerprints of Light on a Complex System (Adv. Mater. 24/2013) (page 3257)

      Hendrik Reinhardt, Hee-Cheol Kim, Clemens Pietzonka, Julia Kruempelmann, Bernd Harbrecht, Bernhard Roling and Norbert Hampp

      Version of Record online: 20 JUN 2013 | DOI: 10.1002/adma.201370155

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      Laser-induced periodic surface structures (LIPSS) are introduced as powerful tools for surface multifunctionalization. The preparation of attractive optical, electrical, magnetic, and catalytic properties is exemplified on common stainless steel to demonstrate the general applicability. As Norbert Hampp and co-workers show on page 3313, the LIPSS process is not limited to small objects. The butterfly featured in the cover image is made of standard steel foil and spans about 7.5 cm.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Review
    8. Communication
    9. Frontispiece
    10. Communications
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      Alternative Plasmonic Materials: Alternative Plasmonic Materials: Beyond Gold and Silver (Adv. Mater. 24/2013) (page 3258)

      Gururaj V. Naik, Vladimir M. Shalaev and Alexandra Boltasseva

      Version of Record online: 20 JUN 2013 | DOI: 10.1002/adma.201370156

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      Beyond Silver and Gold: Better material buildingblocks are essential in transforming the novel ideas of plasmonics and metamaterials into technologies of the future, as reviewed by Alexandra Boltasseva and co-workers on page 3264. Devices built from tailored materials offer improved performance and new functionalities with applications in sensing, imaging, data storage, novel light sources, energy conversion, quantum optics and others. The cover image depicts a negatively refracting metamaterial device built from novel materials. Image prepared with the help of Dr. Alexander V. Kildishev.

  3. Back Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Review
    8. Communication
    9. Frontispiece
    10. Communications
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      Photochemistry: Solar-Powered Nanomechanical Transduction from Crystalline Molecular Rotors (Adv. Mater. 24/2013) (page 3388)

      Sven O. Sylvester and Jacqueline M. Cole

      Version of Record online: 20 JUN 2013 | DOI: 10.1002/adma.201370157

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      The back cover displays the futuristic application of molecular motors within an all-optical circuitry. On page 3324, Jacqueline M. Cole and Sven O. Sylvester demonstrate photochromic molecular transduction via an SO2 photo-isomerisation that drives molecular rotation in a neighbouring benzene ring. Image created using OLEX2 and Persistence of Vision Raytracer software.

  4. Masthead

    1. Top of page
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    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Review
    8. Communication
    9. Frontispiece
    10. Communications
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      Masthead: (Adv. Mater. 24/2013)

      Version of Record online: 20 JUN 2013 | DOI: 10.1002/adma.201370158

  5. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Review
    8. Communication
    9. Frontispiece
    10. Communications
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  6. Review

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Review
    8. Communication
    9. Frontispiece
    10. Communications
    1. Alternative Plasmonic Materials: Beyond Gold and Silver (pages 3264–3294)

      Gururaj V. Naik, Vladimir M. Shalaev and Alexandra Boltasseva

      Version of Record online: 15 MAY 2013 | DOI: 10.1002/adma.201205076

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      Breakthrough ideas in plasmonics and metamaterials require good material building blocks to realize useful devices. Currently, plasmonic and metamaterial devices suffer from many drawbacks arising from the undesirable properties of their material building blocks, especially the metallic components. There are many materials, other than conventional metallic components, such as gold and silver, that exhibit metallic properties and provide advantages in device performance, design flexibility, fabrication, integration, and tunability.

  7. Communication

    1. Top of page
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    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Review
    8. Communication
    9. Frontispiece
    10. Communications
    1. Optically Anisotropic Thin Films by Shear-Oriented Assembly of Colloidal Nanorods (pages 3295–3300)

      Jongwook Kim, Jacques Peretti, Khalid Lahlil, Jean-Pierre Boilot and Thierry Gacoin

      Version of Record online: 13 MAY 2013 | DOI: 10.1002/adma.201300594

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      Device-scale thin films of highly oriented (in-plane) colloidal nanorods are made available by using a simple coating process involving thixotropic rod gel suspensions. Application of this process to LaPO4 nanorods leads to films exhibiting outstanding anisotropic optical properties, such as a remarkably large birefringence (Δn = 0.13) associated with high transparency, and sharply polarized fluorescence spectra when doped with europium.

  8. Frontispiece

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Review
    8. Communication
    9. Frontispiece
    10. Communications
    1. You have free access to this content
      Energy Storage: Highly Ordered MnO2 Nanopillars for Enhanced Supercapacitor Performance (Adv. Mater. 24/2013) (page 3301)

      Zenan Yu, Binh Duong, Danielle Abbitt and Jayan Thomas

      Version of Record online: 20 JUN 2013 | DOI: 10.1002/adma.201370160

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      A simple but highly efficient nanoarchitecturing technique, spin-on nanoprinting (SNAP), is reported by Jayan Thomas and co-workers on page 3302. It is used to print highly ordered polymer nanopillar structures without the use of sacrificial templates or any expensive equipment. Supercapacitors fabricated using this nanostructure show superior electrochemical performance, making it very attractive for the next generation energy storage systems.

  9. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Review
    8. Communication
    9. Frontispiece
    10. Communications
    1. Highly Ordered MnO2 Nanopillars for Enhanced Supercapacitor Performance (pages 3302–3306)

      Zenan Yu, Binh Duong, Danielle Abbitt and Jayan Thomas

      Version of Record online: 2 MAY 2013 | DOI: 10.1002/adma.201300572

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      This report demonstrates a simple, but efficient method to print highly ordered nanopillars without the use of sacrificial templates or any expensive equipment. The printed polymer structure is used as a scaffold to deposit electrode material (manganese dioxide) for making supercapacitors. The simplicity of the fabrication method together with superior power density and energy density make this supercapacitor electrode very attractive for the next-generation energy storage systems.

    2. SnO2/Graphene Composites with Self-Assembled Alternating Oxide and Amine Layers for High Li-Storage and Excellent Stability (pages 3307–3312)

      S. J. Richard Prabakar, Yun-Hwa Hwang, Eun-Gyoung Bae, Sangdeok Shim, Dongwook Kim, Myoung Soo Lah, Kee-Sun Sohn and Myoungho Pyo

      Version of Record online: 13 MAY 2013 | DOI: 10.1002/adma.201301264

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      An alternating stack (SG/GN) consisting of SnO2-functionalized graphene oxide (SG) and amine-functionalized GO (GN) is prepared in solution. The thermally reduced SG/GN (r(SG/GN)) with decreased micro-mesopores and completely eliminated macropores, results in a high reversible capacity and excellent capacity retention (872 mA h g−1 after 200 cycles at 100 mA g−1) when compared to a composite without GN.

    3. Self-Organization of Multifunctional Surfaces – The Fingerprints of Light on a Complex System (pages 3313–3318)

      Hendrik Reinhardt, Hee-Cheol Kim, Clemens Pietzonka, Julia Kruempelmann, Bernd Harbrecht, Bernhard Roling and Norbert Hampp

      Version of Record online: 26 MAR 2013 | DOI: 10.1002/adma.201205031

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      Nanocomposite patterns and nanotemplates are generated by a single-step bottom-up concept that introduces laser-induced periodic surface structures (LIPSS) as a tool for site-specific reaction control in multicomponent systems. Periodic intensity fluctuations of this photothermal stimulus inflict spatial-selective reorganizations, dewetting scenarios and phase segregations, thus creating regular patterns of anisotropic physicochemical properties that feature attractive optical, electrical, magnetic, and catalytic properties.

    4. Highly Efficient Organic Light-Emitting Diode Based on a Hidden Thermally Activated Delayed Fluorescence Channel in a Heptazine Derivative (pages 3319–3323)

      Jie Li, Tetsuya Nakagawa, James MacDonald, Qisheng Zhang, Hiroko Nomura, Hiroshi Miyazaki and Chihaya Adachi

      Version of Record online: 13 MAY 2013 | DOI: 10.1002/adma.201300575

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      An orange-red organic light-emitting diode containing a heptazine derivative exhibits high performance with a maximum external quantum efficiency of 17.5 ± 1.3% and a peak luminance of 17000 ± 1600 cd m−2 without any light out-coupling enhancement. The high electroluminescence performance can be ascribed to the presence of an efficient up-conversion channel from the lowest triplet state to the lowest singlet state.

    5. Solar-Powered Nanomechanical Transduction from Crystalline Molecular Rotors (pages 3324–3328)

      Sven O. Sylvester and Jacqueline M. Cole

      Version of Record online: 18 MAR 2013 | DOI: 10.1002/adma.201300478

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      A photoinduced solid-state SO2 isomerism drives a larger mechanical change (benzene-ring rotation) in a neighbouring ion (i.e., the system acts as a solar-powered molecular transducer). The ring rotation and SO2 photoisomerisation are observed using in situ X-ray crystallography and are controllable, reproducible, and metastable at low temperatures. This discovery presents a new range of materials for solar-energy-based molecular transduction.

    6. Bioactive Silicate Nanoplatelets for Osteogenic Differentiation of Human Mesenchymal Stem Cells (pages 3329–3336)

      Akhilesh K. Gaharwar, Silvia M. Mihaila, Archana Swami, Alpesh Patel, Shilpa Sant, Rui L. Reis, Alexandra P. Marques, Manuela E. Gomes and Ali Khademhosseini

      Version of Record online: 13 MAY 2013 | DOI: 10.1002/adma.201300584

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      Novel silicate nanoplatelets that induce osteogenic differentiation of human mesenchymal stem cells (hMSCs) in the absence of any osteoinductive factor are reported. The presence of the silicate triggers a set of events that follows the temporal pattern of osteogenic differentiation. These findings underscore the potential applications of these silicate nanoplatelets in designing bioactive scaffolds for musculoskeletal tissue engineering.

    7. The Electrocaloric Efficiency of Ceramic and Polymer Films (pages 3337–3342)

      Emmanuel Defay, Sam Crossley, Sohini Kar-Narayan, Xavier Moya and Neil D. Mathur

      Version of Record online: 10 MAY 2013 | DOI: 10.1002/adma.201300606

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      Efficiency is defined as η = |Q|/|W| in order to investigate the electrical work |W| associated with electrocaloric heat |Q|. This materials parameter indicates that polymer films are slightly more energy efficient than ceramic films, and therefore both species of material remain candidates for future cooling applications.

    8. Matrix-Assisted Catalytic Printing for the Fabrication of Multiscale, Flexible, Foldable, and Stretchable Metal Conductors (pages 3343–3350)

      Ruisheng Guo, You Yu, Zhuang Xie, Xuqing Liu, Xuechang Zhou, Yufan Gao, Zhilu Liu, Feng Zhou, Yong Yang and Zijian Zheng

      Version of Record online: 13 MAY 2013 | DOI: 10.1002/adma.201301184

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      Matrix-assisted catalytic printing (MACP) is developed as a low-cost and versatile printing method for the fabrication of multiscale metal conductors on a wide variety of plastic, elastomeric, and textile substrates. Highly conductive Cu interconnects (2.0 × 108 S/m) fabricated by MACP at room temperature display excellent flexibility, foldability, and stretchability.

      Corrected by:

      Correction: Matrix-Assisted Catalytic Printing for the Fabrication of Multiscale, Flexible, Foldable, and Stretchable Metal Conductors

      Vol. 26, Issue 3, 358, Version of Record online: 15 JAN 2014

    9. High-Performance Air-Stable Single-Crystal Organic Nanowires Based on a New Indolocarbazole Derivative for Field-Effect Transistors (pages 3351–3356)

      Kyung Sun Park, Sonali M. Salunkhe, Iseul Lim, Cheon-Gyu Cho, Sung-Hwan Han and Myung Mo Sung

      Version of Record online: 21 MAY 2013 | DOI: 10.1002/adma.201300740

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      A new indolocabazole derivative possessing an extended aromatic core and solubilizing long aliphatic chains effectively self-assembles and crystallizes within the nanoscale channels to form single-crystal nanowires via a direct printing method from an ink solution. Single-crystal organic nanowire transistor arrays based on the π-extended indolocarbazole derivative exhibit an excellent hole mobility of 1.5 cm2 V−1 s−1 and outstanding environmental stability.

    10. Ferroelectric Control of the Conduction at the LaAlO3/SrTiO3 Heterointerface (pages 3357–3364)

      Vu Thanh Tra, Jhih-Wei Chen, Po-Cheng Huang, Bo-Chao Huang, Ye Cao, Chao-Hui Yeh, Heng-Jui Liu, Eugene A. Eliseev, Anna N. Morozovska, Jiunn-Yuan Lin, Yi-Chun Chen, Ming-Wen Chu, Po-Wen Chiu, Ya-Ping Chiu, Long-Qing Chen, Chung-Lin Wu and Ying-Hao Chu

      Version of Record online: 13 MAY 2013 | DOI: 10.1002/adma.201300757

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      Modulation of band bending at a complex oxide heterointerface by a ferroelectric layer is demonstrated. The as-grown polarization (Pup) leads to charge depletion and consequently low conduction. Switching the polarization direction (Pdown) results in charge accumulation and enhances the conduction at the interface. The metal–insulator transition at a conducting polar/nonpolar oxide heterointerface can be controlled by ferroelectric doping.

    11. In Situ Homeotropic Alignment of Nematic Liquid Crystals Based on Photoisomerization of Azo-Dye, Physical Adsorption of Aggregates, and Consequent Topographical Modification (pages 3365–3370)

      Sudarshan Kundu, Myong-Hoon Lee, Seung Hee Lee and Shin-Woong Kang

      Version of Record online: 13 MAY 2013 | DOI: 10.1002/adma.201300730

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      In situ homeotropic alignment is achieved by photochromic trans- to cis-isomerization of an azo-dye doped in a nematic host. The augmented dipole moment of the cis-isomer formed under UV-irradiation expedites molecular assembly into crystalline aggregates. Subsequent deposition of the aggregates creates a roughened surface and induces an anchoring transition from the initial planar to a homeotropic alignment of the LCs.

    12. Piezotronic Effect in Flexible Thin-film Based Devices (pages 3371–3379)

      Xiaonan Wen, Wenzhuo Wu, Yong Ding and Zhong Lin Wang

      Version of Record online: 2 MAY 2013 | DOI: 10.1002/adma.201300296

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      Flexible piezotronic devices based on RF-sputtered piezoelectric semiconductor thin films have been investigated for the first time. The dominating role of the piezotronic effect over the geometrical and piezoresistive effect in the as-fabricated devices has been confirmed and the modulation effect of the piezopotential on charge carrier transport under different strains is subsequently studied. Moreover, it is also demonstrated that the UV sensing capability of the as-fabricated thin film based piezotronic device can be tuned by the piezopotential, showing significantly enhanced sensitivity and improved reset time under tensile strain.

    13. Buckling-Induced Reversible Symmetry Breaking and Amplification of Chirality Using Supported Cellular Structures (pages 3380–3385)

      Sung Hoon Kang, Sicong Shan, Wim L. Noorduin, Mughees Khan, Joanna Aizenberg and Katia Bertoldi

      Version of Record online: 2 MAY 2013 | DOI: 10.1002/adma.201300617

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      Buckling-induced reversible symmetry breaking and amplification of chirality using macro- and microscale supported cellular structures is described. Guided by extensive theoretical analysis, cellular structures are rationally designed, in which buckling induces a reversible switching between achiral and chiral configurations. Additionally, it is demonstrated that the proposed mechanism can be generalized over a wide range of length scales, geometries, materials, and stimuli.

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