Advanced Materials

Cover image for Vol. 22 Issue 42

November 9, 2010

Volume 22, Issue 42

Pages 4659–4778

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Communications
    1. DNA Sensors: A DNA Nanostructure-based Biomolecular Probe Carrier Platform for Electrochemical Biosensing (Adv. Mater. 42/2010) (page 4659)

      Hao Pei, Na Lu, Yanli Wen, Shiping Song, Yan Liu, Hao Yan and Chunhai Fan

      Version of Record online: 2 NOV 2010 | DOI: 10.1002/adma.201090136

      Thumbnail image of graphical abstract

      A 3D DNA nanostructure-based sensor platform for DNA detection is presented by Chunhai Fan, Hao Yan, and co-workers on p. 4754. The strategy provides significantly enhanced spatial positioning range and accessibility for probes on a surface over previously reported DNA-sensing architectures. Use of this versatile detection platform leads to highly sensitive and selective DNA detection in biological fluids and greatly enhanced sequence specificity for SNP typing.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Communications
    1. Fuel Cells: Structure-Morphology-Property Relationships of Non-Perfluorinated Proton-Conducting Membranes (Adv. Mater. 42/2010) (page 4660)

      Timothy J. Peckham and Steven Holdcroft

      Version of Record online: 2 NOV 2010 | DOI: 10.1002/adma.201090137

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      Steven Holdcroft and Timothy Peckham report on p. 4667 on recent progress in the development of non-perfluorinated, proton conducting polymer membranes for fuel cell applications. Emphasis is placed on the use of phase segregation in block and graft copolymer membranes. The cover shows an example of hierarchical clustering of ionic groups that affects factors such as water content, acid concentration, and proton conduction.

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Communications
  4. Progress Report

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Communications
    1. Structure-Morphology-Property Relationships of Non-Perfluorinated Proton-Conducting Membranes (pages 4667–4690)

      Timothy J. Peckham and Steven Holdcroft

      Version of Record online: 16 SEP 2010 | DOI: 10.1002/adma.201001164

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      There has been an explosion in the number of studies on the structure-morphology-property relationships of non-perfluorinated, proton-conducting membranes, particularly those based on graft and block copolymers. Recent work in this area, which illustrates the effects of factors such as water content and morphology upon proton conduction is examined.

  5. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Communications
    1. Carbonaceous Nanofiber Membranes for Selective Filtration and Separation of Nanoparticles (pages 4691–4695)

      Hai-Wei Liang, Lei Wang, Pei-Yang Chen, Hong-Tao Lin, Li-Feng Chen, Dian He and Shu-Hong Yu

      Version of Record online: 21 SEP 2010 | DOI: 10.1002/adma.201001863

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      A new type of free-standing membrane composed of highly uniform carbonaceous nanofibers has been fabricated on a large scale. The membrane with a controllable cut-off size exhibits high flux and excellent size-selective rejection properties, and can be used to filter and separate nanoparticles with different sizes from solution by a simple filtration process.

    2. Shaping White Light Through Electroluminescent Fully Organic Coupled Microcavities (pages 4696–4700)

      Marco Mazzeo, Fabio della Sala, Fabrizio Mariano, Giovanna Melcarne, Stefania D' Agostino, Yu Duan, Roberto Cingolani and Giuseppe Gigli

      Version of Record online: 30 AUG 2010 | DOI: 10.1002/adma.201001631

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      A new approach to generate and manage white light from an organic light emitting diode is shown. It consists in the coupling of two microcavity resonators made of only metallic and organic layers, whose operation principle is analogous to that of two mechanical harmonic oscillators coupled by a spring (see figure). This approach allows the solution of key open points in the field of plastic white light sources.

    3. On Ejecting Colloids Against Capillarity from Sub-micrometer Openings: On-Demand Dielectrophoretic Nanoprinting (pages 4701–4705)

      Niklas C. Schirmer, Carmen Kullmann, Martin S. Schmid, Brian R. Burg, Timo Schwamb and Dimos Poulikakos

      Version of Record online: 27 AUG 2010 | DOI: 10.1002/adma.201001355

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      Complex pattern generation of 2D and 3D structures exceeding 145 000 dpi in resolution is demonstrated by a non-contact, on-demand, colloid ejection and printing method at atmospheric conditions. The method relies on the DC dielectrophoretic actuation of uncharged nanoparticles in colloidal suspensions, driven by short DC voltage pulses, generating large localized electric field gradients in an orifice of O(100 nm).

    4. Low-Temperature Processable Organic-Inorganic Hybrid Gate Dielectrics for Solution-Based Organic Field-Effect Transistors (pages 4706–4710)

      Takashi Nagase, Takashi Hamada, Kenji Tomatsu, Saori Yamazaki, Takashi Kobayashi, Shuichi Murakami, Kimihiro Matsukawa and Hiroyoshi Naito

      Version of Record online: 24 SEP 2010 | DOI: 10.1002/adma.201001871

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      Organic-inorganic hybrid poly(methyl silsesquioxane) with a low curing temperature of 150 °C synthesized by a sol-gel method is employed as a gate dielectric for solution-based organic field-effect transistors. The device exhibits mobility enhancement, compared with those with SiO2 dielectrics, and hysteresis-free, high stable operation, which is attributed to extremely low concentration of silanol groups of the poly(methyl silsesquioxane) dielectric.

    5. Strain-Gated Piezotronic Logic Nanodevices (pages 4711–4715)

      Wenzhuo Wu, Yaguang Wei and Zhong Lin Wang

      Version of Record online: 2 NOV 2010 | DOI: 10.1002/adma.201001925

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      We present the first piezoelectric triggered mechanical-electronic logic operation using the piezotronic effect, through which the integrated mechanical actuation and electronic logic computation are achieved using only ZnO nanowires (NWs). By utilizing the piezoelectric potential created in a ZnO NW under externally applied deformation, strain-gated transistors (SGTs) have been fabricated. Using the SGTs as building blocks, universal logic components such as inverters, NAND, NOR, and XOR gates have been demonstrated for performing piezotronic logic calculations.

    6. Optical Waveguides Based on Single-Crystalline Organic Micro-Tiles (pages 4716–4720)

      Liping Heng, Xinyi Wang, Dongliang Tian, Jin Zhai, Benzhong Tang and Lei Jiang

      Version of Record online: 2 NOV 2010 | DOI: 10.1002/adma.201000444

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      Two-dimensional crystalline micro-tiles are prepared from a small organic hexaphenylsilole (HPS) compound by a self-assembly process. Characteristics of the single micro-tiles indicate that they can serve as active directional optical waveguides. When the excitation point is at one end of a micro-tile, waveguided light is found at the opposite edge and at the nearest parts of the neighboring edges of the micro-tiles, but emission at the diagonal positions is weak or absent (see image).

    7. Size-Dependent LCST Transitions of Polymer-Coated Gold Nanoparticles: Cooperative Aggregation and Surface Assembly (pages 4721–4725)

      Matthew I. Gibson, Dusko Paripovic and Harm-Anton Klok

      Version of Record online: 30 AUG 2010 | DOI: 10.1002/adma.201001382

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      Nanoparticles working together. Thermoresponsive polymer-coated nanoparticles are shown to display size dependent, cooperative, lower critical solution temperature behavior. This was exploited to direct the assembly of appropriate nanoparticles onto complementary polymer brush coated surfaces.

    8. Sound-Driven Piezoelectric Nanowire-Based Nanogenerators (pages 4726–4730)

      Seung Nam Cha, Ju-Seok Seo, Seong Min Kim, Hyun Jin Kim, Young Jun Park, Sang-Woo Kim and Jong Min Kim

      Version of Record online: 30 AUG 2010 | DOI: 10.1002/adma.201001169

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      Sound-driven power generation using nanogenerators based on piezoelectric ZnO nanowires has been demonstrated. Systematic investigations on the power-generating performance of sound-driven nanogenerators clearly support that the measured output voltage originated from the sound-driven nanogenerator. This study shows that sound can be one of promising energy sources when using highly efficient nanogenerators based on piezoelectric nanowires.

    9. Photonic Crystal Devices with Multiple Dyes by Consecutive Local Infiltration of Single Pores (pages 4731–4735)

      Peter W. Nolte, Daniel Pergande, Stefan L. Schweizer, Markus Geuss, Roland Salzer, Brian T. Makowski, Martin Steinhart, Patrick Mack, Daniel Hermann, Kurt Busch, Christoph Weder and Ralf B. Wehrspohn

      Version of Record online: 23 AUG 2010 | DOI: 10.1002/adma.201001718

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      Photonic crystals (PhCs) promise to be useful in many optical elements. While the linear optical properties of PhCs have received considerable attention, their tuneable and nonlinear optical response is not nearly as well understood. We present a method that allows the functionalization of individual pores of silicon photonic crystals with tuneable optical organic materials such as polymers, liquid crystals or low-molecular weight dyes.

    10. Dynamically Crosslinked Gold Nanoparticle – Hyaluronan Hydrogels (pages 4736–4740)

      Aleksander Skardal, Jianxing Zhang, Lindsi McCoard, Siam Oottamasathien and Glenn D. Prestwich

      Version of Record online: 20 AUG 2010 | DOI: 10.1002/adma.201001436

      Thumbnail image of graphical abstract

      Bioprinting consists of automated deposition of cells and biomaterials to mimic the architecture of a tissue. Gold nanoparticles act as dynamic, multivalent crosslinkers for thiol-modified hyaluronic acid and gelatin. The resulting synthetic extracellular matrix can be bioprinted into tubular constructs that support cell proliferation and matrix remodeling. The figure shows a view of a tissue construct (containing a fluorescent dye) in the x-y plane, and the inset shows the print head used.

    11. Novel MOF-Membrane for Molecular Sieving Predicted by IR-Diffusion Studies and Molecular Modeling (pages 4741–4743)

      Helge Bux, Christian Chmelik, Jasper M. van Baten, Rajamani Krishna and Jürgen Caro

      Version of Record online: 2 SEP 2010 | DOI: 10.1002/adma.201002066

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      The predicted permeation selectivity of a binary gas mixture for a metal-organic framework ZIF-8 membrane was estimated from combined Grand Canonical Monte Carlo (GCMC) simulations and infrared microscopy (IRM) data and compared with permeation measurements on a ZIF-8 membrane. It is shown that membrane selectivity can be predicted and hence porous materials can be preselected for membrane applications thus saving time and effort in R&D.

    12. Solution-Processed Highly Efficient Blue Phosphorescent Polymer Light-Emitting Diodes Enabled by a New Electron Transport Material (pages 4744–4748)

      Taeshik Earmme, Eilaf Ahmed and Samson A. Jenekhe

      Version of Record online: 8 SEP 2010 | DOI: 10.1002/adma.201001585

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      High-performance blue phosphorescent light-emitting diodes are fabricated by a new sequential solution-processing method made possible by a new wide-energy-gap electron-transport material. The PhOLEDs show a luminous efficiency of 28.3 cd A−1 with an EQE of 15.5% at 2790 cd m−2. Even at a remarkably high brightness of 10 000 cd m−2, the luminous efficiency remained higher than 20 cd A−1.

    13. Ordered Nanowire Array Blue/Near-UV Light Emitting Diodes (pages 4749–4753)

      Sheng Xu, Chen Xu, Ying Liu, Youfan Hu, Rusen Yang, Qing Yang, Jae-Hyun Ryou, Hee Jin Kim, Zachary Lochner, Suk Choi, Russell Dupuis and Zhong Lin Wang

      Version of Record online: 22 SEP 2010 | DOI: 10.1002/adma.201002134

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      Blue/near-UV light emitting diodes composed of position controlled n-ZnO nanowires arrays and a p-GaN thin film substrate are demonstrated. Under forward bias, each single nanowire is a light emitter. By Gaussian deconvolution of the emission spectrum, the origins of the blue/near-UV emission are assigned specifically to three distinct electron-hole recombination processes. The LEDs give an external quantum efficiency of 2.5%.

    14. A DNA Nanostructure-based Biomolecular Probe Carrier Platform for Electrochemical Biosensing (pages 4754–4758)

      Hao Pei, Na Lu, Yanli Wen, Shiping Song, Yan Liu, Hao Yan and Chunhai Fan

      Version of Record online: 13 SEP 2010 | DOI: 10.1002/adma.201002767

      Thumbnail image of graphical abstract

      A 3D DNA nanostructure-based sensor platform for DNA detection has been developed. This strategy provides significantly enhanced spatial positioning range and accessibility of the probes on a surface over previously reported DNA sensing architectures. The use of this versatile DNA nanostructure-based detection platform leads to highly sensitive and selective DNA detection in biological fluids and greatly enhanced sequence specificity for SNP typing.

    15. Crumpled Graphene Nanosheets as Highly Effective Barrier Property Enhancers (pages 4759–4763)

      Owen C. Compton, Soyoung Kim, Cynthia Pierre, John M. Torkelson and SonBinh T. Nguyen

      Version of Record online: 9 SEP 2010 | DOI: 10.1002/adma.201000960

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      Near-trace concentrations (0.02 vol%) of crumpled graphene nanosheets suspended within a polystyrene matrix drastically inhibit the permeation of oxygen molecules through the resulting polymer-graphene nanocomposite. This decrease in permeability is a direct result of the low solubility of oxygen within the nanocomposite, which is considerably densified by the graphene.

    16. Spray-Deposited Li-Doped ZnO Transistors with Electron Mobility Exceeding 50 cm2/Vs (pages 4764–4769)

      George Adamopoulos, Aneeqa Bashir, Stuart Thomas, William P. Gillin, Stamatis Georgakopoulos, Maxim Shkunov, Mohamed A. Baklar, Natalie Stingelin, Robert C. Maher, Lesley F. Cohen, Donal D. C. Bradley and Thomas D. Anthopoulos

      Version of Record online: 27 AUG 2010 | DOI: 10.1002/adma.201001444

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      Ambient spray pyrolysis is used for the deposition of high quality polycrystalline ZnO films utilizing blends of precursor solutions based on Zinc and Lithium acetates and the demonstration of n-channel thin-film transistors with electron mobility exceeding 50 cm2/Vs (Figure).

    17. Formation of Self-Organized Superlattice Nanotube Arrays – Embedding Heterojunctions into Nanotube Walls (pages 4770–4774)

      Wei Wei, Himendra Jha, Guang Yang, Robert Hahn, Indhumati Paramasivam, Steffen Berger, Erdmann Spiecker and Patrik Schmuki

      Version of Record online: 27 AUG 2010 | DOI: 10.1002/adma.201002091

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      In the present work we introduce the growth of 3D-superlattice nanotubes by a simple anodization technique. Highly defined self-organized, oxide tubes with modulated tube wall composition can be created that allow altering and tuning optical, electrical and chemical properties of such nanometer-size architectures. The image shows a stacked nanotube array with built-in TiO2/ Ta2O5 heterojunctions.

    18. Pyridoindole Derivative as Electron Transporting Host Material for Efficient Deep-blue Phosphorescent Organic Light-emitting Diodes (pages 4775–4778)

      Hirohiko Fukagawa, Norimasa Yokoyama, Shiro Irisa and Shizuo Tokito

      Version of Record online: 27 AUG 2010 | DOI: 10.1002/adma.201001221

      Thumbnail image of graphical abstract

      An electron-transporting host material suitable for deep-blue phosphorescent organic light-emitting diodes has been developed. The material exhibits electron-transport characteristics, high triplet energy, and high thermal stability. It is designed by integrating electron-transporting pyridoindole substituents into a bulky adamantane core (see Figure), and is demonstrated to be an excellent host for deep-blue phosphorescent dopant emitters.

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