Advanced Materials

Cover image for Vol. 26 Issue 18

May 14, 2014

Volume 26, Issue 18

Pages 2765–2961

  1. Cover Picture

    1. Top of page
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    6. Masthead
    7. Contents
    8. Communications
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    10. Communications
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      Field-Effect Transistors: Flexible and Transparent Silicon-on-Polymer Based Sub-20 nm Non-planar 3D FinFET for Brain-Architecture Inspired Computation (Adv. Mater. 18/2014) (page 2765)

      Galo A. Torres Sevilla, Jhonathan P. Rojas, Hossain M. Fahad, Aftab M. Hussain, Rawan Ghanem, Casey E. Smith and Muhammad M. Hussain

      Article first published online: 8 MAY 2014 | DOI: 10.1002/adma.201470116

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      The brain's cortex is folded and thus can accommodate billions of neurons in an ultra-compact area. On page 2794, M. M. Hussain and co-workers demonstrate the world's first state-of-the-art non-planar 3D FinFET on flexible silicon-on-polymer using a CMOS compatible process to enable brain-architecture-inspired future ultra-high performance electronics-based computer design. This approach can also result in stylish product design in the near future for ultra-mobile devices and consumer electronics.

  2. Inside Front Cover

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      Luminescent Nanoparticles: Elimination of Photon Quenching by a Transition Layer to Fabricate a Quenching-Shield Sandwich Structure for 800 nm Excited Upconversion Luminescence of Nd3+-Sensitized Nanoparticles (Adv. Mater. 18/2014) (page 2766)

      Yeteng Zhong, Gan Tian, Zhanjun Gu, Yijun Yang, Lin Gu, Yuliang Zhao, Ying Ma and Jiannian Yao

      Article first published online: 8 MAY 2014 | DOI: 10.1002/adma.201470117

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      Nd3+-sensitized quenching-shield sandwich structure upconversion nanoparticles are designed by J. Yao, Y. Ma, Y. Zhao, and co-workers on page 2831. The transition layer in this unique structure is essential to eliminate the photon-quenching effect caused by Nd3+-doping, and simultaneously bridge the energy transfer from the sensitizer to the activator. Therefore the Nd3+ concentration can reach up to 90%, which significantly increases the photon absorption ability of upconversion nanoparticles (UCNPs), resulting in a greatly enhanced luminescence intensity.

  3. Inside Back Cover

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      Microflaps: Magnetically Responsive Microflaps Reveal Cell Membrane Boundaries from Multiple Angles (Adv. Mater. 18/2014) (page 2963)

      Tetsuhiko Teshima, Hiroaki Onoe, Hiroka Aonuma, Kaori Kuribayashi-Shigetomi, Koki Kamiya, Taishi Tonooka, Hirotaka Kanuka and Shoji Takeuchi

      Article first published online: 8 MAY 2014 | DOI: 10.1002/adma.201470121

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      S. Takeuchi and co-workers present on page 2850 a microflap system to incline adherent cells in the desired orientation. The inclination angles of the cell-laden microflaps are precisely controlled by a magnetic field, enabling cell membrane boundaries to be observed from multiple angles. This system is applied to obtain clear focused images of parasite infection with high magnification, leading to the potential to elucidate the mechanisms that drive microbial infection.

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      Direct Patterning: Hydrogel-Mediated Direct Patterning of Conducting Polymer Films with Multiple Surface Chemistries (Adv. Mater. 18/2014) (page 2964)

      SooHyun Park, Guang Yang, Nrutya Madduri, Mohammad Reza Abidian and Sheereen Majd

      Article first published online: 8 MAY 2014 | DOI: 10.1002/adma.201470122

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      A simple yet multifaceted approach to create patterned films of conducting polymers with various geometries and surface chemistries is presented by S. Majd and co-workers on page 2782. In this approach, electropolymerization through hydrogel stamps enables micropatterning of conducting polymers with multiple chemistries in a single-step and solution-free process. These patterned polymer films are able to encapsulate bioactive molecules such as antibodies or proteins, and can serve as a sensing platform.

  5. Masthead

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    1. Masthead: (Adv. Mater. 18/2014)

      Article first published online: 8 MAY 2014 | DOI: 10.1002/adma.201470119

  6. Contents

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    1. Contents: (Adv. Mater. 18/2014) (pages 2767–2776)

      Article first published online: 8 MAY 2014 | DOI: 10.1002/adma.201470118

  7. Communications

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    1. Direct 3-D Nanoparticle Assemblies in Thin Films via Topographically Patterned Surfaces (pages 2777–2781)

      Joseph Kao, Seong-Jun Jeong, Zhang Jiang, Dong Hyun Lee, Karim Aissou, Caroline A. Ross, Thomas P. Russell and Ting Xu

      Article first published online: 6 FEB 2014 | DOI: 10.1002/adma.201305561

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      Simple yet versatile routes to generate macroscopically aligned 3-D NP arrays with tunable structures in supramolecular nanocomposite thin films are presented using faceted and lithographically patterned surfaces. These studies provide a powerful platform for the investigation of emerging structure–property relationships in functional nanocomposites, paving the way for the realization of next-generation devices.

    2. Hydrogel-Mediated Direct Patterning of Conducting Polymer Films with Multiple Surface Chemistries (pages 2782–2787)

      SooHyun Park, Guang Yang, Nrutya Madduri, Mohammad Reza Abidian and Sheereen Majd

      Article first published online: 13 MAR 2014 | DOI: 10.1002/adma.201306093

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      A new methodology for selective electropolymerization of conducting polymer films using wet hydrogel stamps is presented. The ability of this simple method to generate patterned films of conducting polymers with multiple surface chemistries in a one-step process and to incorporate fragile biomolecules in these films is demonstrated.

  8. Frontispiece

    1. Top of page
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    3. Inside Front Cover
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    7. Contents
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      Transition Metal Oxides: Electron-Beam-Induced Perovskite–Brownmillerite–Perovskite Structural Phase Transitions in Epitaxial La2/3Sr1/3MnO3 Films (Adv. Mater. 18/2014) (page 2788)

      Lide Yao, Sayani Majumdar, Laura Äkäslompolo, Sampo Inkinen, Qi Hang Qin and Sebastiaan van Dijken

      Article first published online: 8 MAY 2014 | DOI: 10.1002/adma.201470120

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      Structural phase transitions driven by oxygen vacancy ordering can drastically affect the properties of transition metal oxides. S. van Dijken, L. D. Yao, and co-workers demonstrate on page 2789 that the focused electron beam of a transmission electron microscope can be used to control structural phase transitions in epitaxial La2/3Sr1/3MnO3. The image is an artistic impression of the experiments. It consists of two scanning transmission electron microscopy images, one before and one after electron-beam irradiation, which are blended to illustrate the writing of a new structural phase in the area that is exposed to the electron beam.

  9. Communications

    1. Top of page
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    10. Communications
    1. Electron-Beam-Induced Perovskite–Brownmillerite–Perovskite Structural Phase Transitions in Epitaxial La2/3Sr1/3MnO3 Films (pages 2789–2793)

      Lide Yao, Sayani Majumdar, Laura Äkäslompolo, Sampo Inkinen, Qi Hang Qin and Sebastiaan van Dijken

      Article first published online: 19 FEB 2014 | DOI: 10.1002/adma.201305656

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      Structural phase transitions driven by oxygen-vacancy ordering can drastically affect the properties of transition metal oxides. The focused electron beam of a transmission electron microscope (TEM) can be used to control structural phase transitions in epitaxial La2/3Sr1/3MnO3. The ability to induce and characterize oxygen-deficient structural phases simultaneously in a continuous and controllable manner opens up new pathways for atomic-scale studies of transition metal oxides and other complex materials.

    2. Flexible and Transparent Silicon-on-Polymer Based Sub-20 nm Non-planar 3D FinFET for Brain-Architecture Inspired Computation (pages 2794–2799)

      Galo A. Torres Sevilla, Jhonathan P. Rojas, Hossain M. Fahad, Aftab M. Hussain, Rawan Ghanem, Casey E. Smith and Muhammad M. Hussain

      Article first published online: 22 FEB 2014 | DOI: 10.1002/adma.201305309

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      An industry standard 8′′ silicon-on-insulator wafer based ultra-thin (1 μm), ultra-light-weight, fully flexible and remarkably transparent state-of-the-art non-planar three dimensional (3D) FinFET is shown. Introduced by Intel Corporation in 2011 as the most advanced transistor architecture, it reveals sub-20 nm features and the highest performance ever reported for a flexible transistor.

    3. Isolation of Specific Small-Diameter Single-Wall Carbon Nanotube Species via Aqueous Two-Phase Extraction (pages 2800–2804)

      Jeffrey A. Fagan, Constantine Y. Khripin, Carlos A. Silvera Batista, Jeffrey R. Simpson, Erik H. Hároz, Angela R. Hight Walker and Ming Zheng

      Article first published online: 21 JAN 2014 | DOI: 10.1002/adma.201304873

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      Aqueous two-phase extraction is demonstrated to enable isolation of single semiconducting and metallic single-wall carbon nanotube species from a synthetic mixture. The separation is rapid and robust, with remarkable tunability via modification of the surfactant environment set for the separation.

    4. Low-Cost, Flexible, and Self-Cleaning 3D Nanocone Anti-Reflection Films for High-Efficiency Photovoltaics (pages 2805–2811)

      Kwong-Hoi Tsui, Qingfeng Lin, Hungtao Chou, Qianpeng Zhang, Huiying Fu, Pengfei Qi and Zhiyong Fan

      Article first published online: 21 JAN 2014 | DOI: 10.1002/adma.201304938

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      Low-cost engineered nanotemplates are used to mold flexible nanocone anti-reflection (AR) films. Both optical reflectance measurements and photovoltaics characterizations demonstrate that the flexible nanocone AR films can considerably suppress device front-side reflectance and thus improve the power conversion efficiency of high-efficiency thin-film CdTe solar cells. Additionally, these nanocone AR films are found to be superhydrophobic and thus possess self-cleaning capability.

    5. Epitaxial Growth of Molecular Crystals on van der Waals Substrates for High-Performance Organic Electronics (pages 2812–2817)

      Chul-Ho Lee, Theanne Schiros, Elton J. G. Santos, Bumjung Kim, Kevin G. Yager, Seok Ju Kang, Sunwoo Lee, Jaeeun Yu, Kenji Watanabe, Takashi Taniguchi, James Hone, Efthimios Kaxiras, Colin Nuckolls and Philip Kim

      Article first published online: 23 JAN 2014 | DOI: 10.1002/adma.201304973

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      Epitaxial van der Waals (vdW) heterostructures of organic and layered materials are demonstrated to create high-performance organic electronic devices. High-quality rubrene films with large single-crystalline domains are grown on h-BN dielectric layers via vdW epitaxy. In addition, high carrier mobility comparable to free-standing single-crystal counterparts is achieved by forming interfacial electrical contacts with graphene electrodes.

    6. Freestanding Triboelectric-Layer-Based Nanogenerators for Harvesting Energy from a Moving Object or Human Motion in Contact and Non-contact Modes (pages 2818–2824)

      Sihong Wang, Yannan Xie, Simiao Niu, Long Lin and Zhong Lin Wang

      Article first published online: 21 JAN 2014 | DOI: 10.1002/adma.201305303

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      For versatile mechanical energy harvesting from arbitrary moving objects such as humans, a new mode of triboelectric nanogenerator is developed based on the sliding of a freestanding triboelectric-layer between two stationary electrodes on the same plane. With two electrodes alternatively approached by the tribo-charges on the sliding layer, electricity is effectively generated due to electrostatic induction. A unique feature of this nanogenerator is that it can operate in non-contact sliding mode, which greatly increases the lifetime and the efficiency of such devices.

    7. Solubility-Limited Extrinsic n-Type Doping of a High Electron Mobility Polymer for Thermoelectric Applications (pages 2825–2830)

      Ruth A. Schlitz, Fulvio G. Brunetti, Anne M. Glaudell, P. Levi Miller, Michael A. Brady, Christopher J. Takacs, Craig J. Hawker and Michael L. Chabinyc

      Article first published online: 21 JAN 2014 | DOI: 10.1002/adma.201304866

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      The thermoelectric properties of a highperformance electron-conducting polymer, (P(NDIOD-T2), extrinsically doped with dihydro-1H-benzoimidazol-2-yl (NDBI) derivatives, are reported. The highest thermoelectric power factor that has been reported for a solution-processed n-type polymer is achieved; and it is concluded that engineering polymerdopant miscibility is essential for the development of organic thermoelectrics.

    8. Elimination of Photon Quenching by a Transition Layer to Fabricate a Quenching-Shield Sandwich Structure for 800 nm Excited Upconversion Luminescence of Nd3+-Sensitized Nanoparticles (pages 2831–2837)

      Yeteng Zhong, Gan Tian, Zhanjun Gu, Yijun Yang, Lin Gu, Yuliang Zhao, Ying Ma and Jiannian Yao

      Article first published online: 12 DEC 2013 | DOI: 10.1002/adma.201304903

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      Nd3+-sensitized quenching-shield sandwich-structured upconversion nanoparticles are reported, which exhibit highly efficient upconversion photoluminescence under excitation by an 800 nm continuous-wave laser. The transition-layer structure is essential to bridge energy transfer from the sensitizer to the activator and simultaneously block energy back-transfer from the activator to the sensitizer. These 800 nm-excited upconversion nanoparticles are a key step toward the development of upconversion nanophosphors for biological applications.

    9. Paper Microfluidics Goes Digital (pages 2838–2843)

      Ryan Fobel, Andrea E. Kirby, Alphonsus H. C. Ng, Ramin R. Farnood and Aaron R. Wheeler

      Article first published online: 23 JAN 2014 | DOI: 10.1002/adma.201305168

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      The first example of so-called “digital microfluidics” (DMF) implemented on paper by inkjet printing is reported. A sandwich enzyme-linked immunosorbent assay (ELISA) is demonstrated as an example of a complex, multistep protocol that would be difficult to achieve with capillary-driven paper microfluidics. Furthermore, it is shown that paper-based DMF devices have comparable performance to traditional photolithographically patterned DMF devices at a fraction of the cost.

    10. Semiconductor Alloy Nanoribbon Lateral Heterostructures for High-Performance Photodetectors (pages 2844–2849)

      Pengfei Guo, Wei Hu, Qinglin Zhang, Xiujuan Zhuang, Xiaoli Zhu, Hong Zhou, Zhengping Shan, Jinyou Xu and Anlian Pan

      Article first published online: 21 FEB 2014 | DOI: 10.1002/adma.201304967

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      High-performance visible-light photodetectors are achieved based on single nanoribbon lateral heterostructures composed of two different semiconductor alloys epitaxially grown in the lateral direction. They reveal superior spectral response range, responsivity, Ion/Ioff ratio, and external quantum efficiency, relative to devices based on single composition structures.

    11. Magnetically Responsive Microflaps Reveal Cell Membrane Boundaries from Multiple Angles (pages 2850–2856)

      Tetsuhiko Teshima, Hiroaki Onoe, Hiroka Aonuma, Kaori Kuribayashi-Shigetomi, Koki Kamiya, Taishi Tonooka, Hirotaka Kanuka and Shoji Takeuchi

      Article first published online: 22 FEB 2014 | DOI: 10.1002/adma.201305494

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      A microflap system to incline adherent cells in the desired orientation is described. Inclination angles of cell-laden microflaps are precisely controlled by the applied magnetic field, enabling us to observe cell-membrane boundaries from multiple angles. This system is equipped with conventional microscopes, allowing clear focused images of cell-membrane boundaries to be obtained with high magnification.

    12. Properties of Individual Dopant Atoms in Single-Layer MoS2: Atomic Structure, Migration, and Enhanced Reactivity (pages 2857–2861)

      Yung-Chang Lin, Dumitru O. Dumcenco, Hannu-Pekka Komsa, Yoshiko Niimi, Arkady V. Krasheninnikov, Ying-Sheng Huang and Kazu Suenaga

      Article first published online: 22 FEB 2014 | DOI: 10.1002/adma.201304985

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      Single-layered MoS2 doped with Re (n-type) and Au (p-type) are investigated by in situ scanning transmission electron microscopy. Re atoms substituting Mo sites enhance the local chemical affinity, evidenced by agglomeration of other dopant/impurity atoms. Au atoms exist as adatoms and show larger mobility under the electron beam. These behaviors are consistent with density functional theory calculations.

    13. Specific and Reproducible Gas Sensors Utilizing Gas-Phase Chemical Reaction on Organic Transistors (pages 2862–2867)

      Yaping Zang, Fengjiao Zhang, Dazhen Huang, Chong-an Di, Qing Meng, Xike Gao and Daoben Zhu

      Article first published online: 8 FEB 2014 | DOI: 10.1002/adma.201305011

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      Utilizing a textbook reaction on the surface of an organic active channel, achieves sensitive detection of HCl, NH3 and NO2, with good selectivity, excellent reproducibility, and satisfactory stability. These results reveal gas-phase reaction assisted detection as a unique and promising approach to construct practical applicable gas sensors with typical organic transistors.

    14. Novel Graphene/Carbon Nanotube Composite Fibers for Efficient Wire-Shaped Miniature Energy Devices (pages 2868–2873)

      Hao Sun, Xiao You, Jue Deng, Xuli Chen, Zhibin Yang, Jing Ren and Huisheng Peng

      Article first published online: 25 JAN 2014 | DOI: 10.1002/adma.201305188

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      Novel nanostructured composite fibers based on graphene and carbon nanotubes are developed with high tensile strength, electrical conductivity, and electrocatalytic activity. As two application demonstrations, these composite fibers are used to fabricate flexible, wire-shaped dye-sensitized solar cells and electrochemical supercapacitors, both with high performances, for example, a maximal energy conversion efficiency of 8.50% and a specific capacitance of ca. 31.50 F g−1. These miniature wire-shaped devices are further shown to be promising for flexible and portable electronic facilities.

    15. Gate Control of Percolative Conduction in Strongly Correlated Manganite Films (pages 2874–2877)

      Takafumi Hatano, Zhigao Sheng, Masao Nakamura, Masaki Nakano, Masashi Kawasaki, Yoshihiro Iwasa and Yoshinori Tokura

      Article first published online: 30 JAN 2014 | DOI: 10.1002/adma.201304813

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      Gate control of percolative conduction in a phase-separated manganite system is demonstrated in a field-effect transistor geometry, resulting in ambipolar switching from a metallic state to an insulating state.

    16. New Visible Light Absorbing Materials for Solar Fuels, Ga(Sbx)N1−x (pages 2878–2882)

      Swathi Sunkara, Venkat Kalyan Vendra, Jacek Bogdan Jasinski, Todd Deutsch, Antonis N. Andriotis, Krishna Rajan, Madhu Menon and Mahendra Sunkara

      Article first published online: 17 FEB 2014 | DOI: 10.1002/adma.201305083

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      A novel visible-light-absorbing dilute alloy, Ga(Sbx)N1−x is synthesized by metal organic chemical vapor deposition (MOCVD) for solar hydrogen production. Significant bandgap reduction of GaN, from 3.4 eV to 1.8 eV, is observed, with a low (2%) incorporation of antimonide, and the lattice expansion is in agreement with our first-principles calculations. The band edges of Ga(Sbx)N1−x are found to straddle the water redox potentials showing excellent suitability for solar water splitting.

    17. Spatioselective Growth of Metal-Organic Framework Nanocrystals on Compositionally Anisotropic Polymer Particles (pages 2883–2888)

      Tae-Hong Park, Kyung Jin Lee, Sangyeul Hwang, Jaewon Yoon, Christof Woell and Joerg Lahann

      Article first published online: 14 FEB 2014 | DOI: 10.1002/adma.201305461

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      Selective growth of metal organic framework materials on the surface of compartmentalized polymer microparticles is achieved by electro-hydrodynamic co-jetting, selective surface modification, and anisotropic crystal growth.

    18. AFM Imaging of Molecular Spin-State Changes through Quantitative Thermomechanical Measurements (pages 2889–2893)

      Edna M. Hernández, Carlos M. Quintero, Olena Kraieva, Christophe Thibault, Christian Bergaud, Lionel Salmon, Gábor Molnár and Azzedine Bousseksou

      Article first published online: 8 FEB 2014 | DOI: 10.1002/adma.201305539

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      Quantitative atomic force microscopy is used in conjunction with microwire heaters for high-resolution imaging of the Young's modulus changes across the spin-state transition. When going from the high spin to the low spin state, a significant stiffening is observed.

    19. Long-Range Ordered Self-Assembly of Novel Acrylamide-Based Diblock Copolymers for Nanolithography and Metallic Nanostructure Fabrication (pages 2894–2900)

      Je Gwon Lee, Yeon Sik Jung, Sung-Hwan Han, Kwan-Mook Kim and Yang-Kyoo Han

      Article first published online: 6 FEB 2014 | DOI: 10.1002/adma.201305186

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      Novel acrylamide-based hard-soft hybrid block copolymers generate high-quality nanolithographic patterns satisfying high-resolution, long-range ordering, low defect density, moderate etch selectivity, and easy pattern transfer onto a substrate. The resulting patterns can also be used as a scaffold for metallic nanostructures such as aligned nanowires and nanomeshes with extraordinary structural regularity.

    20. Controlling SEI Formation on SnSb-Porous Carbon Nanofibers for Improved Na Ion Storage (pages 2901–2908)

      Liwen Ji, Meng Gu, Yuyan Shao, Xiaolin Li, Mark H. Engelhard, Bruce W. Arey, Wei Wang, Zimin Nie, Jie Xiao, Chongmin Wang, Ji-Guang Zhang and Jun Liu

      Article first published online: 8 FEB 2014 | DOI: 10.1002/adma.201304962

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      Porous carbon nanofiber (CNF)-supported tin-antimony (SnSb) alloys are synthesized and applied as a sodium-ion battery anode. The chemistry and morphology of the solid electrolyte interphase (SEI) film and its correlation with the electrode performance are studied. The addition of fluoroethylene carbonate (FEC) in the electrolyte significantly reduces electrolyte decomposition and creates a very thin and uniform SEI layer on the cycled electrode surface, which an promote the kinetics of Na-ion migration/transportation, leading to excellent electrochemical performance.

    21. Moisture-Activated Torsional Graphene-Fiber Motor (pages 2909–2913)

      Huhu Cheng, Yue Hu, Fei Zhao, Zelin Dong, Yanhong Wang, Nan Chen, Zhipan Zhang and Liangti Qu

      Article first published online: 21 JAN 2014 | DOI: 10.1002/adma.201305708

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      A new type of moisture-driven rotational motor is developed using a helical arrangement of graphene sheets along a graphene oxide fiber, which not only presents remarkable performance as a reversible rotary motor with a rotary speed of up to about 5200 revolutions per minute under humidity alternation, but also allows the construction of humidity switches and promising moisture-triggered electric generators.

    22. Effect of Mixed Layer Crystallinity on the Performance of Mixed Heterojunction Organic Photovoltaic Cells (pages 2914–2918)

      Byeongseop Song, Cedric Rolin, Jeramy D. Zimmerman and Stephen R. Forrest

      Article first published online: 8 FEB 2014 | DOI: 10.1002/adma.201305099

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      Organic vapor-phase deposition (OVPD) is used to grow tetraphenyldibenzoperiflanthen (DBP):C70 mixed heterojunction photovoltaic devices. Compared with vacuum thermal evaporation (VTE), the OVPD-grown film develops nanocrystalline domains of C70. Optimized OVPD-grown OPVs have a 61% fill factor for a 100 nm active layer thickness, whereas VTE-grown devices have a 47% fill factor at the same thickness.

    23. Scalable Integration of Indium Zinc Oxide/Photosensitive-Nanowire Composite Thin-Film Transistors for Transparent Multicolor Photodetectors Array (pages 2919–2924)

      Xingqiang Liu, Lang Jiang, Xuming Zou, Xiangheng Xiao, Shishang Guo, Changzhong Jiang, Xi Liu, Zhiyong Fan, Weida Hu, Xiaoshuang Chen, Wei Lu, Wenping Hu and Lei Liao

      Article first published online: 14 FEB 2014 | DOI: 10.1002/adma.201305073

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      By incorporating crystalline photosensitive nanowires (NWs), an amorphous InZnO (a-IZO) thin film is designed to be sensitive to the primary colors of light via a facile sol-gel approach. The mobility is also improved. The composite devices leverage the advantages of the transparency of a-IZO with the photosensitivity of CdS NWs.

    24. Nitrogen and Oxygen Dual-Doped Carbon Hydrogel Film as a Substrate-Free Electrode for Highly Efficient Oxygen Evolution Reaction (pages 2925–2930)

      Sheng Chen, Jingjing Duan, Mietek Jaroniec and Shi-Zhang Qiao

      Article first published online: 8 FEB 2014 | DOI: 10.1002/adma.201305608

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      A three-dimensional (3D) electrode composed of nitrogen, oxygen dualdoped graphene–carbon nanotube hydrogel film is fabricated, which greatly favors the transport and access of gas and reaction intermediates, and shows a remarkable oxygen-evolution catalytic performance in both alkaline and acidic solutions.

    25. Efficient and Stable White Organic Light-Emitting Diodes Employing a Single Emitter (pages 2931–2936)

      Guijie Li, Tyler Fleetham and Jian Li

      Article first published online: 25 JAN 2014 | DOI: 10.1002/adma.201305507

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      Using a single tetradentate platinum emitter dubbed Pt7O7, efficient and stable white organic light-emitting diodes are developed. The excimer-based white devices achieve an external quantum efficiency (EQE) of 24.5%, coordinates of (0.37, 0.42) based on the Commission internationale de l'éclairage (CIE) system, and a color rendering index (CRI) of 70. Moreover, devices of Pt7O7 in a stable structure demonstrate operational lifetimes (50% initial luminance) of 36 h at an elevated driving current of 20 mA cm2, which corresponds to over 10 000 h at 100 cd m2.

    26. H-Shaped Oligofluorenes for Highly Air-Stable and Low-Threshold Non-Doped Deep Blue Lasing (pages 2937–2942)

      Yan Qian, Qi Wei, Gonzalo Del Pozo, Marta M. Mróz, Larry Lüer, Santiago Casado, Juan Cabanillas-Gonzalez, Qi Zhang, Linghai Xie, Ruidong Xia and Wei Huang

      Article first published online: 24 MAR 2014 | DOI: 10.1002/adma.201305355

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      H-shaped oligofluorenes as gain media exhibit excellent photo- (large robustness against oxidation) and thermal stabilities in ambient atmosphere for large σe and low-threshold (0.22 nJ pulse−1) deep blue distributed feedback (DFB) lasers. Their amplified spontaneous emission (ASE) thresholds increase less than 3-fold and the emission spectra exhibit almost no shift with film samples annealed up to 200 °C in open air.

    27. An Intelligent Superwetting PVDF Membrane Showing Switchable Transport Performance for Oil/Water Separation (pages 2943–2948)

      Mimi Tao, Lixin Xue, Fu Liu and Lei Jiang

      Article first published online: 12 FEB 2014 | DOI: 10.1002/adma.201305112

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      A superamphiphilic poly(vinylidene fluoride) (PVDF) membrane with superoleophobicity under water and superhydrophobicity under oil is successfully prepared. Due to the switchable transport performance, the membrane is applicable to the separation of various oil-in-water and water-in-oil emulsions with a droplet size greater than 20 nm, and shows superior permeability and antifouling properties, as well as a high separation efficiency.

    28. Enhanced Electroactive Response of Unidirectional Elastomeric Composites with High-Dielectric-Constant Fibers (pages 2949–2953)

      Krishna Bala Subramani, Enes Cakmak, Richard J. Spontak and Tushar K. Ghosh

      Article first published online: 22 JAN 2014 | DOI: 10.1002/adma.201305821

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      A fiber-elastomer composite design with a vastly improved and directional actuation response is proposed for dielectric elastomer actuators. The all-elastomer composites are capable of achieving remarkably high actuation stresses, directional strains, electromechanical coupling efficiencies, and energy densities at relatively low electric fields. Their electromechanical metrics are among the highest reported for this class of electroactive materials.

    29. Stimulated Emission and Lasing from CdSe/CdS/ZnS Core-Multi-Shell Quantum Dots by Simultaneous Three-Photon Absorption (pages 2954–2961)

      Yue Wang, Van Duong Ta, Yuan Gao, Ting Chao He, Rui Chen, Evren Mutlugun, Hilmi Volkan Demir and Han Dong Sun

      Article first published online: 6 FEB 2014 | DOI: 10.1002/adma.201305125

      Thumbnail image of graphical abstract

      Three-photon pumped stimulated emission and coherent random lasing from colloidal CdSe/CdS/ZnS core–multishell quantum dots are achieved for the first time. These results can offer new possibilities in biology and photonics, as well as at their intersection of biophotonics.

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