Advanced Materials

Cover image for Advanced Materials

April 17, 2012

Volume 24, Issue 15

Pages 1917–2058

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Review
    7. Frontispiece
    8. Communications
    1. Ultrathin Nanosheets: Giant Moisture Responsiveness of VS2 Ultrathin Nanosheets for Novel Touchless Positioning Interface (Adv. Mater. 15/2012) (page 1917)

      Jun Feng, Lele Peng, Changzheng Wu, Xu Sun, Shuanglin Hu, Chenwen Lin, Jun Dai, Jinlong Yang and Yi Xie

      Version of Record online: 10 APR 2012 | DOI: 10.1002/adma.201290085

      Thumbnail image of graphical abstract

      C. Wu, Y. Xie, and co-workers have created ultrathin nanosheets which act as novel interfaces by sensing the 2D position information of fingertips approaching their surfaces, without any need for physical contact. On page 1969, they describe how these nanosheets are highly moisture-sensitive and respond very quickly, giving both the position and the relative height of approaching fingertips in real time. Such a touch-free interface could enable advanced, highly flexible interactive systems.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Review
    7. Frontispiece
    8. Communications
    1. Ferroelectricity: Octahedral Rotation-Induced Ferroelectricity in Cation Ordered Perovskites (Adv. Mater. 15/2012) (page 1918)

      James M. Rondinelli and Craig J. Fennie

      Version of Record online: 10 APR 2012 | DOI: 10.1002/adma.201290086

      Thumbnail image of graphical abstract

      Ferroelectric oxides do the twist. On page 1961, J. M. Rondinelli and C. J. Fennie explain how to engineer polar displacements, indicated by the gray arrows in the image, from rotations, a ‘twist-like’ distortion of corner-connected oxygen octahedra that are common to ABO3 perovskite oxides. The first-principles calculations reveal that layered A-site ordering, seen by the alternating gold and magenta spheres forming an atomic-scale superlattice, allows the octahedral rotations to induce ferroelectricity. Simple guidelines are outlined to realize these materials, creating a new route to ferroelectrics by design.

  3. Masthead

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Review
    7. Frontispiece
    8. Communications
    1. Masthead: (Adv. Mater. 15/2012)

      Version of Record online: 10 APR 2012 | DOI: 10.1002/adma.201290087

  4. Contents

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

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Review
    7. Frontispiece
    8. Communications
    1. Light-Driven Chiral Molecular Switches or Motors in Liquid Crystals (pages 1926–1945)

      Yan Wang and Quan Li

      Version of Record online: 13 MAR 2012 | DOI: 10.1002/adma.201200241

      Thumbnail image of graphical abstract

      The ability to tune molecular self-organization with an external stimulus is a main driving force in the bottom-up nanofabrication of molecular devices. Light-driven chiral molecular switches or motors in liquid crystals that are capable of self-organizing into optically tunable helical superstructures undoubtedly represent such a striking example. In this review, we focus on different classes of light-driven chiral molecular switches or motors in liquid crystal media for the induction and manipulation of photoresponsive cholesteric LC systems and their consequent applications.

  6. Frontispiece

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Review
    7. Frontispiece
    8. Communications
    1. Dynamic Electrostatic Lithography: Multiscale On-Demand Patterning on Large-Area Curved Surfaces (Adv. Mater. 15/2012) (page 1946)

      Qiming Wang, Mukarram Tahir, Jianfeng Zang and Xuanhe Zhao

      Version of Record online: 10 APR 2012 | DOI: 10.1002/adma.201290084

      Thumbnail image of graphical abstract

      A new technology is invented, described on page 1947 by X. Zhao and coworkers, for the use of electrical voltages to dynamically generate various patterns on curved surfaces and over large areas, such as the surfaces of gloves. As a result, the texture and smoothness of these surfaces can be varied on demand for a wide variety of applications.

  7. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Review
    7. Frontispiece
    8. Communications
    1. Dynamic Electrostatic Lithography: Multiscale On-Demand Patterning on Large-Area Curved Surfaces (pages 1947–1951)

      Qiming Wang, Mukarram Tahir, Jianfeng Zang and Xuanhe Zhao

      Version of Record online: 15 MAR 2012 | DOI: 10.1002/adma.201200272

      Thumbnail image of graphical abstract

      Dynamic electrostatic lithography is invented to dynamically generate various patterns on large-area and curved polymer surfaces under the control of electrical voltages. The shape of the pattern can be tuned from random creases and craters to aligned creases, craters and lines, and the size of the pattern from millimeters to sub-micrometers.

    2. Tailoring Nanostructures Using Copolymer Nanoimprint Lithography (pages 1952–1955)

      Pascal Thébault, Stefan Niedermayer, Stefan Landis, Nicolas Chaix, Patrick Guenoun, Jean Daillant, Xingkun Man, David Andelman and Henri Orland

      Version of Record online: 21 MAR 2012 | DOI: 10.1002/adma.201103532

      Thumbnail image of graphical abstract

      The generation of defect-free polymer nanostructures by nanoimprinting methods is described. Long-range nanorheology and shorter-range surface energy effects can be efficiently combined to provide alignment of copolymer lamellae over several micrometers. As an example, a perpendicular organization with respect to circular tracks is shown, demonstrating the possibility of writing ordered radial nanostructures over large distances.

    3. Small-Molecule Photovoltaics Based on Functionalized Squaraine Donor Blends (pages 1956–1960)

      Xin Xiao, Guodan Wei, Siyi Wang, Jeramy D. Zimmerman, Christopher K. Renshaw, Mark E. Thompson and Stephen R. Forrest

      Version of Record online: 26 MAR 2012 | DOI: 10.1002/adma.201104261

      Thumbnail image of graphical abstract

      Two squaraine (SQ) donor molecules with different absorption bands are blended together for better coverage of the solar spectrum. The blend SQ device shows a significant improvement compared with single SQ donor devices. By applying a solvent annealing process and a compound buffer layer, a power-conversion efficiency of 5.9 ± 0.3% is achieved under 1 sun illumination.

    4. Octahedral Rotation-Induced Ferroelectricity in Cation Ordered Perovskites (pages 1961–1968)

      James M. Rondinelli and Craig J. Fennie

      Version of Record online: 10 APR 2012 | DOI: 10.1002/adma.201104674

      Thumbnail image of graphical abstract

      Electronic structure calculations based on density functional theory have uncovered a novel mechanism for inducing ferroelectric polarizations in cation ordered perovskites. We outline a materials selection strategy for designing this behavior. The guidelines are based on the octahedral rotations found in the two constituent oxides and the way the perovskite building blocks are interwoven to form the superlattice.

    5. Giant Moisture Responsiveness of VS2 Ultrathin Nanosheets for Novel Touchless Positioning Interface (pages 1969–1974)

      Jun Feng, Lele Peng, Changzheng Wu, Xu Sun, Shuanglin Hu, Chenwen Lin, Jun Dai, Jinlong Yang and Yi Xie

      Version of Record online: 19 MAR 2012 | DOI: 10.1002/adma.201104681

      Thumbnail image of graphical abstract

      Utilizing a thin film of VS2 ultrathin nanosheets with giant and fast moisture responsiveness, a brand-new model of moisture-based positioning interface is put forward here, by which not only the 2D position information of finger tips can be acquired, but also the relative height can be detected as the third dimensionality, representing a promising platform for advanced man-machine interactive systems.

    6. Hierarchical and Multifunctional Three-Dimensional Network of Carbon Nanotubes for Microfluidic Applications (pages 1975–1979)

      Jeongeun Seo, Tae Jae Lee, Seungbin Ko, Haegu Yeo, Suhawn Kim, Taeyong Noh, Simon Song, Myung M. Sung and Haiwon Lee

      Version of Record online: 16 MAR 2012 | DOI: 10.1002/adma.201104958

      Thumbnail image of graphical abstract

      Three-Dimensional network of carbon nanotubes: The 3D network of CNTs have hierarchical structures comprised of interconnected SWNTs between Si pillars in microfluidic channels. The Al2O3 coated 3D networks were used for size different nanoparticles filtration and streptavidin capturing in very diluted solution. The 3D network of SWNTs systems will provide a robust multifuncitonal platform for a variety of biomedical and environmental applications.

    7. Transparent Metals for Ultrabroadband Electromagnetic Waves (pages 1980–1986)

      Ren-Hao Fan, Ru-Wen Peng, Xian-Rong Huang, Jia Li, Yongmin Liu, Qing Hu, Mu Wang and Xiang Zhang

      Version of Record online: 19 MAR 2012 | DOI: 10.1002/adma.201104483

      Thumbnail image of graphical abstract

      Making metals transparent, which could lead to fascinating applications, has long been pursued. Here we demonstrate that with narrow slit arrays metallic plates become transparent for extremely broad bandwidths; the high transmission efficiency is insensitive to the metal thickness. This work provides a guideline to develop novel devices, including transparent conducting panels, broadband metamaterials, and antireflective solar cells.

    8. Temperature Sensing and In Vivo Imaging by Molybdenum Sensitized Visible Upconversion Luminescence of Rare-Earth Oxides (pages 1987–1993)

      Bin Dong, Baosheng Cao, Yangyang He, Zhuang Liu, Zhipeng Li and Zhiqing Feng

      Version of Record online: 16 MAR 2012 | DOI: 10.1002/adma.201200431

      Thumbnail image of graphical abstract

      A novel high excited state energy transfer pathway to overcome the phonon quenching effect in rare-earth (RE) oxide upconversion (UC) materials is reported. In Er(Tm)-Yb oxide systems, an extraordinary enhancement of UC luminescence efficiency with four orders of magnitude is realized by Mo co-doping. The RE oxides with significant UC efficiency are successfully utilized for temperature sensing and in vivo imaging.

    9. Photochemical Preparation of Sub-Wavelength Heterogeneous Laser-Induced Periodic Surface Structures (pages 1994–1998)

      Hee-Cheol Kim, Hendrik Reinhardt, Pierre Hillebrecht and Norbert A. Hampp

      Version of Record online: 16 MAR 2012 | DOI: 10.1002/adma.201200534

      Thumbnail image of graphical abstract

      Laser-induced periodic surface structures (LIPSS) are a phenomenon caused by interaction of light with solid surfaces. We present a photochemical concept which uses LIPSS-related light intensity patterns for the generation of heterogeneous nanostructures. The process facilitates arbitrary combinations of substrate and LIPSS-pattern materials. An efficient method for the generation of organometallic hybrid-nanowire arrays on porous anodic aluminum oxide is demonstrated.

    10. Color-Tunable Photoluminescent Fullerene Nanoparticles (pages 1999–2003)

      Jinyoung Jeong, Juyeon Jung, Mijin Choi, Ju Whan Kim, Sang J. Chung, Sujin Lim, Han Lee and Bong Hyun Chung

      Version of Record online: 19 MAR 2012 | DOI: 10.1002/adma.201104772

      Thumbnail image of graphical abstract

      Highly water-soluble and color-tunable photoluminescent fullerene nanoparticles are synthesized by using tetraethylene glycol (TEG) and lithium hydroxide as a catalyst. The maximum PL emission changes depend on the contents of the remaining π-conjugation in oxidized C60, which is partially covalently conjugated with TEG. The PL behavior is attributed to an electronic transition change due to the distortion of symmetrical C60.

    11. Gray to Colorless Switching, Crosslinked Electrochromic Polymers with Outstanding Stability and Transmissivity From Naphthalenediimmide-Functionalized EDOT (pages 2004–2008)

      Mauro Sassi, Matteo M. Salamone, Riccardo Ruffo, Claudio M. Mari, Giorgio A. Pagani and Luca Beverina

      Version of Record online: 19 MAR 2012 | DOI: 10.1002/adma.201200111

      Thumbnail image of graphical abstract

      The design, synthesis, polymerization and full electrochemical and spectroelectrochemical characterization of a new naphtalendiimide-functionalized PEDOT cross-linked electrochromic material is reported. The polymer shows exceptionally high redox reversibility, almost complete colorlessness in the bleached state and a gray color in the reduced state

    12. Spiro-Linked Hyperbranched Architecture in Electrophosphorescent Conjugated Polymers for Tailoring Triplet Energy Back Transfer (pages 2009–2013)

      Shiyang Shao, Zhihua Ma, Junqiao Ding, Lixiang Wang, Xiabin Jing and Fosong Wang

      Version of Record online: 19 MAR 2012 | DOI: 10.1002/adma.201104544

      Thumbnail image of graphical abstract

      A spiro-linked hyperbranched architecture has been incorporated into electrophosphorescent conjugated polymers for the first time, aiming at simultaneously tailoring the intra- and intermolecular triplet energy back transfer from the phosphorescent guest to the conjugated polymer host. Based on a prototype with this unique structure, slower decay of triplet excitons, and 5–8 fold enhancement of device efficiencies are obtained compared with the conventional blending counterpart.

    13. Metal-Organic Framework Templated Synthesis of Fe2O3/TiO2 Nanocomposite for Hydrogen Production (pages 2014–2018)

      Kathryn E. deKrafft, Cheng Wang and Wenbin Lin

      Version of Record online: 19 MAR 2012 | DOI: 10.1002/adma.201200330

      Thumbnail image of graphical abstract

      A new metal-organic framework (MOF)-templated method has been developed for the synthesis of a metal oxide nanocomposite with interesting photophysical properties. Fe-containing nanoscale MOFs are coated with amorphous titania, then calcined to produce crystalline Fe2O3/TiO2 composite nanoparticles. This material enables photocatalytic hydrogen production from water using visible light, which cannot be achieved by either Fe2O3 or TiO2 alone or a mixture of the two.

    14. Half-Metallic Carbon Nanotubes (pages 2019–2023)

      Kyu Won Lee and Cheol Eui Lee

      Version of Record online: 15 MAR 2012 | DOI: 10.1002/adma.201200104

      Thumbnail image of graphical abstract

      Half-metallicity in carbon nanotubes is achieved and controlled by hydrogen adsorption patterns. The edge states in carbon nanotubes are unstable under an electric field due to the spin-conserving electron transfer between the edges, but a large enough transfer barrier between the edge states, obtained by controlling the adsorption patterns, renders the CNTs half-metallic.

    15. Mechanism for the Amorphisation of Diamond (pages 2024–2029)

      Barbara A. Fairchild, Sergey Rubanov, Desmond W. M. Lau, Marc Robinson, Irene Suarez-Martinez, Nigel Marks, Andrew D. Greentree, Dougal McCulloch and Steven Prawer

      Version of Record online: 15 MAR 2012 | DOI: 10.1002/adma.201104511

      Thumbnail image of graphical abstract

      The breakdown of the diamond lattice is explored by ion implantation and molecular dynamics simulations. We show that lattice breakdown is strain-driven, rather than damage-driven, and that the lattice persists until 16% of the atoms have been removed from their lattice sites. The figure shows the transition between amorphous carbon and diamond, with the interfaces highlighted with dashed lines.

    16. High-Performance Energy-Storage Architectures from Carbon Nanotubes and Nanocrystal Building Blocks (pages 2030–2036)

      Zheng Chen, Dieqing Zhang, Xiaolei Wang, Xilai Jia, Fei Wei, Hexing Li and Yunfeng Lu

      Version of Record online: 26 MAR 2012 | DOI: 10.1002/adma.201104238

      Thumbnail image of graphical abstract

      High-performance energy-storage architectures are fabricated by forming conformal coatings of active nanocrystal building blocks on preformed carbon nanotube conductive scaffolds for lithium ion electrodes. This unique structure offers effective pathways for charge transport, high active-material loading, structure robustness, and flexibility. This general approach enables the fabrication of a new family of high-performance architectures for energy storage and many other applications.

    17. Hydrothermal Treatment of Grass: A Low-Cost, Green Route to Nitrogen-Doped, Carbon-Rich, Photoluminescent Polymer Nanodots as an Effective Fluorescent Sensing Platform for Label-Free Detection of Cu(II) Ions (pages 2037–2041)

      Sen Liu, Jingqi Tian, Lei Wang, Yingwei Zhang, Xiaoyun Qin, Yonglan Luo, Abdullah M. Asiri, Abdulrahman O. Al-Youbi and Xuping Sun

      Version of Record online: 15 MAR 2012 | DOI: 10.1002/adma.201200164

      Thumbnail image of graphical abstract

      Increasing reaction temperature produces photoluminescent polymer nanodots (PPNDs) with decreased particle size and increased quantum yield. Such PPNDs are used as an effective fluorescent sensing platform for label-free sensitive and selective detection of Cu(II) ions with a detection limit as low as 1 nM. This method is successfully applied to determine Cu2+ in real water samples.

    18. Electrolytic Hydriding of LaFe13−xSix Alloys for Energy Efficient Magnetic Cooling (pages 2042–2046)

      Julia Lyubina, Ullrich Hannemann, Mary P. Ryan and Lesley F. Cohen

      Version of Record online: 19 MAR 2012 | DOI: 10.1002/adma.201200112

      Thumbnail image of graphical abstract

      An effective, low-temperature and readily available electrochemical method for tuning the operation temperature of LaFe13-xSix-type alloys is demonstrated. Electrolytically hydrided materials have the same high level magnetic properties as in high temperature gas-phase processed materials and offer an advantage of higher hydrogen absorption rate in the ferromagnetic state.

    19. Nitrogen-Doped Porous Carbon Nanofiber Webs as Anodes for Lithium Ion Batteries with a Superhigh Capacity and Rate Capability (pages 2047–2050)

      Long Qie, Wei-Min Chen, Zhao-Hui Wang, Qing-Guo Shao, Xiang Li, Li-Xia Yuan, Xian-Luo Hu, Wu-Xing Zhang and Yun-Hui Huang

      Version of Record online: 16 MAR 2012 | DOI: 10.1002/adma.201104634

      Thumbnail image of graphical abstract

      Nitrogen-doped carbon nanofiber webs (CNFWs) with high surface areas are successfully prepared by carbonization-activation of polypyrrole nanofiber webs with KOH. The as-obtained CNFWs exhibit a superhigh reversible capacity of 943 mAh g−1 at a current density of 2 A g−1 even after 600 cycles, which is ascribed to the novel porous nanostructure and high-level nitrogen doping.

    20. Tetravalent Dysprosium in a Perovskite-Type Oxide (pages 2051–2053)

      Donglin Han, Tetsuya Uda, Yoshitaro Nose, Toshihiro Okajima, Hidenobu Murata, Isao Tanaka and Kozo Shinoda

      Version of Record online: 19 MAR 2012 | DOI: 10.1002/adma.201200127

      Thumbnail image of graphical abstract

      The existence of tetravalent dysprosium in perovskite-type oxide barium zirconate is confirmed in this work. This discovery will stimulate many researchers in diverse fields such as catalysts, solid state ionics, sensors, and fluorescent materials.

    21. Phosphorescent Organic Light-Emitting Diodes with Outstanding External Quantum Efficiency using Dinuclear Rhenium Complexes as Dopants (pages 2054–2058)

      Matteo Mauro, Cheng-Han Yang, Chin-Yao Shin, Monica Panigati, Chih-Hao Chang, Giuseppe D'Alfonso and Luisa De Cola

      Version of Record online: 19 MAR 2012 | DOI: 10.1002/adma.201104831

      Thumbnail image of graphical abstract

      The photophysical and electroluminescence properties of two dinuclear rhenium(I) carbonyl complexes bearing 1,2-diazines are comprehensively investigated. The bromo-bridged complex is successfully used as triplet emitter for the preparation of vacuum-processed OLEDs with outstanding external quantum efficiencies, reaching a value of 10%.

SEARCH

SEARCH BY CITATION