Advanced Materials

Cover image for Vol. 22 Issue 32

August 24, 2010

Volume 22, Issue 32

Pages 3499–3620

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    7. Research News
    1. Exciton–Plasmon Coupling: Dynamic Tuning of Plasmon–Exciton Coupling in Arrays of Nanodisk–J-aggregate Complexes (Adv. Mater. 32/2010)

      Yue Bing Zheng, Bala Krishna Juluri, Lin Lin Jensen, Daniel Ahmed, Mengqian Lu, Lasse Jensen and Tony Jun Huang

      Article first published online: 16 AUG 2010 | DOI: 10.1002/adma.201090105

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      Tony Jun Huang and co-workers report on p. 3603 on the formation of exciton–plasmon states and in situ dynamic control of coupling strength in Au nanodisk arrays coated with J-aggregate molecules. By changing the incident angle of incoming light, rather than changing the geometry of the nanoparticles, plasmon–exciton coupling of variable strengths can be observed. The approach enables a simple yet powerful platform for dynamic control of exciton–plasmon coupling.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    7. Research News
    1. Silk Metamaterials: Metamaterial Silk Composites at Terahertz Frequencies (Adv. Mater. 32/2010)

      Hu Tao, Jason J. Amsden, Andrew C. Strikwerda, Kebin Fan, David L. Kaplan, Xin Zhang, Richard D. Averitt and Fiorenzo G. Omenetto

      Article first published online: 16 AUG 2010 | DOI: 10.1002/adma.201090106

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      Natural silk fibers provide the raw material to constitute biocompatible films with ideal properties for device integration, as reported by Xin Zhang, Richard D. Averitt, Fiorenzo G. Omenetto, and coworkers on p. 3527. The image shows a metamaterial structure patterned directly onto a 2 cm × 2 cm freestanding silk film placed on a bed of natural silk threads to visually recapitulate the origin and end point of the fabrication.

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    7. Research News
    1. Contents: (Adv. Mater. 32/2010) (pages 3499–3505)

      Article first published online: 16 AUG 2010 | DOI: 10.1002/adma.201090107

  4. Review

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    7. Research News
    1. Towards Supramolecular Engineering of Functional Nanomaterials: Pre-Programming Multi-Component 2D Self-Assembly at Solid-Liquid Interfaces (pages 3506–3520)

      Artur Ciesielski, Carlos-Andres Palma, Massimo Bonini and Paolo Samorì

      Article first published online: 12 JUL 2010 | DOI: 10.1002/adma.201001582

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      Supramolecular engineering comprises the design, synthesis and self-assembly of well-defined molecular modules into tailor-made architectures. The tailoring of the materials properties relies on the full control over the self-assembly behavior of molecular modules exposing recognition sites and incorporating functional units. Scanning tunneling microscopy studies were used to gain detailed insight, with a sub-nanometer resolution, into the formation of responsive multicomponent architectures with controlled geometries and properties.

  5. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    7. Research News
    1. Specific Protein Detection Using Thermally Reduced Graphene Oxide Sheet Decorated with Gold Nanoparticle-Antibody Conjugates (pages 3521–3526)

      Shun Mao, Ganhua Lu, Kehan Yu, Zheng Bo and Junhong Chen

      Article first published online: 21 JUL 2010 | DOI: 10.1002/adma.201000520

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      A highly sensitive and selectivefield-effect transistor biosensor using thermally reduced graphene oxide (TRGO) sheet decorated with gold nanoparticle-antibody conjugates is demonstrated. Probe antibody (anti-Immunoglobulin G) is labeled on the surface of the TRGO sheet through gold nanoparticles and electrical detection of the protein binding (Immunoglobulin G and anti-Immunoglobulin G) is accomplished by FET and dc measurements.

    2. Metamaterial Silk Composites at Terahertz Frequencies (pages 3527–3531)

      Hu Tao, Jason J. Amsden, Andrew C. Strikwerda, Kebin Fan, David L. Kaplan, Xin Zhang, Richard D. Averitt and Fiorenzo G. Omenetto

      Article first published online: 21 JUL 2010 | DOI: 10.1002/adma.201000412

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      Fabrication and characterization of the first large area metamaterial structures patterned on free-standing biocompatible silk substrates is reported. Strong resonance responses at terahertz frequencies are shown, providing a promising path towards the development a new class of metamaterial-inspired bioelectric and biophotonic devices.

    3. Ordered Nanosphere Alignment of Porphyrin for the Improvement of Nonlinear Optical Properties (pages 3532–3536)

      Changshui Huang, Yuliang Li, Yinglin Song, Yongjun Li, Huibiao Liu and Daoben Zhu

      Article first published online: 23 JUN 2010 | DOI: 10.1002/adma.200904421

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      Using the small molecule TEOP (5,10,15,20-[1,4-benzodioxane-6-carboxalde]porphyrin), the in situ assembly is a very convenient and efficient approach for fabricating high-quality ordered patterns. The well-ordered patterns possess strong saturated absorptive and self-defocusing nonlinearities while the TEOP solution exhibit reverse saturated absorption. The value of the nonlinear absorption coefficient of the TEOP ordered pattern and solution differed by three orders of magnitude.

    4. Top-Gate Organic Thin-Film Transistors Constructed by a General Lamination Approach (pages 3537–3541)

      Lei Zhang, Chong-an Di, Yan Zhao, Yunlong Guo, Xiangnan Sun, Yugeng Wen, Weiyi Zhou, Xiaowei Zhan, Gui Yu and Yunqi Liu

      Article first published online: 20 JUL 2010 | DOI: 10.1002/adma.201000123

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      The lamination method, an effective way to fabricate multilayer devices, is successfully applied in the fabrication of top-gate organic thin-film transitors (OTFTs), especially the solution-processed devices. The fabricated top-gate devices exhibit both high performance and good stability.

    5. Poly(methacrylic acid)-Grafted Carbon Nanotube Scaffolds Enhance Differentiation of hESCs into Neuronal Cells (pages 3542–3547)

      Tzu-I Chao, Shuhuai Xiang, Jessica Faye Lipstate, Changchun Wang and Jennifer Lu

      Article first published online: 22 JUL 2010 | DOI: 10.1002/adma.201000262

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      Poly(methacrylic acid)-grafted carbon nanotube-based thin films are found to significantly improve the neuronal differentiation efficiency, and relatively mature neuronal cells have been derived directly from hESCs, owing to their excellent protein sequestration ability and nanofibrillar characteristics. This novel material platform creates new opportunities in the tissue regeneration field.

    6. Nucleic Acid Diagnostic FRET Particles Based on Layer-by-Layer Technology (pages 3548–3552)

      Jing Kang, Martin Loew, Anna Arbuzova, Ioanna Andreou and Lars Dähne

      Article first published online: 21 JUL 2010 | DOI: 10.1002/adma.201000794

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      An advanced system based on layer-by-layer (LbL) technology and fluorescence resonance energy transfer (FRET) for the detection of small amounts of DNA has been developed. Several advantages over conventional particle systems due to nanoroughness, flexibility and specific surface properties of LbL films were determined, making LbL-oligonucleotide particles a first choice for homogeneous diagnostic assays.

    7. Light-Scribing Emissive Patterns on Polymer Films Through a Light-Induced Depletion of Phosphorescence Quenching (pages 3553–3557)

      Giorgio Macchi, Francesco Meinardi and Riccardo Tubino

      Article first published online: 21 JUL 2010 | DOI: 10.1002/adma.201000659

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      Highly-emissive patterns on porphyrin-doped polymeric samples are obtained by a novel, single-step, fully-optical method, by simply scanning light over the film surface. This light-scribing process is based on the depletion of luminescence quenching, achieved through a light-promoted reduction of O2 concentration.

    8. The Growth Mechanism of Copper Nanowires and Their Properties in Flexible, Transparent Conducting Films (pages 3558–3563)

      Aaron R. Rathmell, Stephen M. Bergin, Yi-Lei Hua, Zhi-Yuan Li and Benjamin J. Wiley

      Article first published online: 4 JUN 2010 | DOI: 10.1002/adma.201000775

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      Copper nanowires grow from spherical copper seeds in an aqueous solution. Conductive films of copper nanowires have a transmittance of 65% (∼15% more than the best values reported for carbon nanotubes), and remain conductive after 1000 bending cycles or one month in air.

    9. High-Speed Spatial Atomic-Layer Deposition of Aluminum Oxide Layers for Solar Cell Passivation (pages 3564–3567)

      Paul Poodt, Adriaan Lankhorst, Fred Roozeboom, Karel Spee, Diederik Maas and Ad Vermeer

      Article first published online: 21 JUL 2010 | DOI: 10.1002/adma.201000766

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      Al2O3 thin films deposited at rates as high as 1.2 nm s−1 using spatially separated atomic layer deposition show excellent solar cell surface passivation properties, i.e., recombination velocities of <2 cm s−1. This disruptive ALD concept opens the way for cost-effective manufacturing with high industrial throughput numbers.

    10. A Color-Tuneable Organic Light-Emitting Transistor (pages 3568–3572)

      Eva J. Feldmeier, Martin Schidleja, Christian Melzer and Heinz von Seggern

      Article first published online: 29 JUN 2010 | DOI: 10.1002/adma.201000980

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      An organic light-emitting field-effect transistor whose emission color can be changed by the applied voltage is presented. The transistor is based on a parallel layer stack of acenes serving as organic transport and emission layers. During operation, the position of the recombination zone can be moved by a proper change in the drain and gate bias from one organic semiconductor of the stack to the other, inducing a change in the emission color from green to red.

    11. Direct Identification of the Conducting Channels in a Functioning Memristive Device (pages 3573–3577)

      John Paul Strachan, Matthew D. Pickett, J. Joshua Yang, Shaul Aloni, A. L. David Kilcoyne, Gilberto Medeiros-Ribeiro and R. Stanley Williams

      Article first published online: 4 JUN 2010 | DOI: 10.1002/adma.201000186

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      Titanium dioxide memristive devices have been non-destructively characterized using x-ray absorption spectromicroscopy and TEM. These techniques allow direct identification of the chemistry and structure of the conducting channel responsible for the bipolar resistance switching seen in these devices. Within the TiO2 matrix, we observe the formation of a Ti4O7 Magnéli phase possessing metallic properties and ordered planes of oxygen vacancies.

    12. The Materials Challenge in Diffraction-Unlimited Direct-Laser-Writing Optical Lithography (pages 3578–3582)

      Joachim Fischer, Georg von Freymann and Martin Wegener

      Article first published online: 30 JUN 2010 | DOI: 10.1002/adma.201000892

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      Using a novel photoresist (composed of pentaerythritol triacrylate and isopropyl thioxanthone) that favors stimulated emission depletion by a π-π* transition and using a two-color two-photon excitation scheme, 65-nm wide lines are achieved. This value is limited by parasitic two-photon absorption of the continuous-wave depletion beam. It is estimated that, without this process, line widths of 30 nm are in reach.

    13. Lithium Iron Borates as High-Capacity Battery Electrodes (pages 3583–3587)

      Atsuo Yamada, Nobuyuki Iwane, Yu Harada, Shin-ichi Nishimura, Yukinori Koyama and Isao Tanaka

      Article first published online: 9 JUN 2010 | DOI: 10.1002/adma.201001039

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      Beyond the limited lithium storage capability of the (PO4)3−-based compound, LiFePO4 (170 mAh/g), which is currently recognized as the most promising lithium battery cathode for large-scale application, a compound with the lightest small triangle oxyanion unit (BO3)3−, namely LiFeBO3, exhibits a much larger reversible capacity of ca. 200 mAh/g with surprisingly small volume change of ca. 2%.

    14. Highly Permeable Macroporous Polymers Synthesized from Pickering Medium and High Internal Phase Emulsion Templates (pages 3588–3592)

      Vivian O. Ikem, Angelika Menner, Tommy S. Horozov and Alexander Bismarck

      Article first published online: 21 JUL 2010 | DOI: 10.1002/adma.201000729

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      Open porous poly-Pickering-M/HIPEs with permeabilities of up to 2.6 D were prepared by polymerisation of Pickering-M/HIPEs to which small amounts of surfactant were added. The permeability of these poly-Pickering-M/HIPEs is more than 5 times that of conventional polyHIPEs. This approach allows the synthesis of a novel class of permeable particle reinforced macroporous polymers with significant potential for practical exploitation.

    15. Acetal-Modified Dextran Microparticles with Controlled Degradation Kinetics and Surface Functionality for Gene Delivery in Phagocytic and Non-Phagocytic Cells (pages 3593–3597)

      Joel A. Cohen, Tristan T. Beaudette, Jessica L. Cohen, Kyle E. Broaders, Eric M. Bachelder and Jean M. J. Fréchet

      Article first published online: 4 JUN 2010 | DOI: 10.1002/adma.201000307

      Thumbnail image of graphical abstract

      A microparticulate gene delivery system based on biodegradable and acid-sensitive acetal-modified dextran with unprecedented tunability of degradation rates and simplicity of surface functionalization is presented. When optimally formulated with small amounts of cationic polymers, these microparticles are capable of efficiently transfecting both phagocytic and non-phagocytic cells with minimal toxicity.

    16. Air-Stable Solution-Processed Hybrid Transistors with Hole and Electron Mobilities Exceeding 2 cm2 V−1 s−1 (pages 3598–3602)

      Jeremy Smith, Aneeqa Bashir, George Adamopoulos, John E. Anthony, Donal D. C. Bradley, Martin Heeney, Iain McCulloch and Thomas D. Anthopoulos

      Article first published online: 21 JUL 2010 | DOI: 10.1002/adma.201000195

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      An alternative approach for the development of high-performance unipolar and ambipolar thin-film transistors and integrated circuits based on hybrid heterostructures comprising a phase-separated solution processed p-type organic small-molecule:polymer semicondcutor blend and a spray-coated n-type ZnO semiconductor layer is demonstrated.

    17. Dynamic Tuning of Plasmon–Exciton Coupling in Arrays of Nanodisk–J-aggregate Complexes (pages 3603–3607)

      Yue Bing Zheng, Bala Krishna Juluri, Lin Lin Jensen, Daniel Ahmed, Mengqian Lu, Lasse Jensen and Tony Jun Huang

      Article first published online: 21 JUL 2010 | DOI: 10.1002/adma.201000251

      Thumbnail image of graphical abstract

      Dynamic tuning of plasmon–exciton resonant coupling in arrays of nanodisk–J-aggregate complexes is demonstrated. The angle-resolved spectra of an array of bare gold nanodisks exhibit continuous shifting of localized surface plasmon resonance. This characteristic enables the production of real-time, controllable spectral overlap between molecular resonance and plasmonic resonance. The resonant interaction strength as a function of spectral overlap is explored and the coupling strength changes with the incident angle of a probe light, in accord with simulations based on coupled dipole approximation method.

  6. Research News

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    7. Research News
    1. Nanoimprint Lithography for Functional Three-Dimensional Patterns (pages 3608–3614)

      Yuval Ofir, Isaac W. Moran, Chandramouleeswaran Subramani, Kenneth R. Carter and Vincent M. Rotello

      Article first published online: 15 JUN 2010 | DOI: 10.1002/adma.200904396

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      Nanoimprint lithography (NIL) provides a rapid, versatile, and scalable tool for nanopatterning, presenting direct access to both two- and three-dimensional structures, including complex topologies. This Research News article focuses on the use of NIL for the patterning of functional polymers as well as materials capable of further chemical modification (see figure).

    2. Making Patterns on Graphene (pages 3615–3620)

      Yong Zhou and Kian Ping Loh

      Article first published online: 8 JUN 2010 | DOI: 10.1002/adma.201000436

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      The lithographic patterning of graphene, which is required for the large-scale processing of electronic device, remains a significant challenge. This Research News article highlights and evaluates recent developments in the nanostructuring and patterning of graphene.

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