Advanced Materials

Cover image for Vol. 21 Issue 22

June 12, 2009

Volume 21, Issue 22

Pages 2249–2346

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Communications
    7. Research News
    8. Index
    1. Palladium Nanostructures: Synthesis and Structural Characterization of Branched Palladium Nanostructures (Adv. Mater. 22/2009)

      John Watt, Neil Young, Sarah Haigh, Angus Kirkland and Richard D. Tilley

      Version of Record online: 8 JUN 2009 | DOI: 10.1002/adma.200990082

      Thumbnail image of graphical abstract

      The front cover stylizes the formation of a palladium tripod nanoparticle, an unusual morphology for a particle that crystallises in the highly symmetrical face centred cubic crystal structure. Their growth is controlled by introducing both twinning into the nanoparticle nuclei and kinetically controlled growth conditions. Richard Tilley and co-workers provide on p. 2288 insights into the formation of anisotropic noble metal nanoparticles, important for a range of applications.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Communications
    7. Research News
    8. Index
    1. Polymeric Nanohairs: Stooped Nanohairs: Geometry-Controllable, Unidirectional, Reversible, and Robust Gecko-like Dry Adhesive (Adv. Mater. 22/2009)

      Tae-il Kim, Hoon Eui Jeong, Kahp Y. Suh and Hong H. Lee

      Version of Record online: 8 JUN 2009 | DOI: 10.1002/adma.200990083

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      Kahp Suh, Hong Lee, and co-workers present on p. 2276 a simple, yet robust method for fabricating an array of stooped “nanohairs” by applying a proper choice of materials and post e-beam exposure, even for an aspect ratio of 10. The stooped nanohairs possess the unidirectional feature of frictional adhesion with a remarkably high adhesion force (∼11 N cm−2).

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Communications
    7. Research News
    8. Index
  4. Progress Report

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Communications
    7. Research News
    8. Index
    1. Microcontact Printing: Limitations and Achievements (pages 2257–2268)

      András Perl, David N. Reinhoudt and Jurriaan Huskens

      Version of Record online: 23 MAR 2009 | DOI: 10.1002/adma.200801864

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      The main concept of the µCP process is the formation of patterned self-assembled monolayers when an inked elastomeric stamp is in conformal contact with a substrate. The number of µCP-related publications (determined using Scifinder Scholar 2007) has significantly increased in the past 15 years, showing the increasing interest in this easy and versatile surface patterning technique.

  5. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Communications
    7. Research News
    8. Index
    1. Electrosynthesized Surface-Imprinted Conducting Polymer Microrods for Selective Protein Recognition (pages 2271–2275)

      Anna Menaker, Vitali Syritski, Jekaterina Reut, Andres Öpik, Viola Horváth and Róbert E. Gyurcsányi

      Version of Record online: 8 APR 2009 | DOI: 10.1002/adma.200803597

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      Novel surface-imprinted conducting polymer microrods are shown to selectively recognize the template protein, as demonstrated by competitive binding assays using fluorescence detection. The electrochemical template synthesis provides means for controlled fabrication and spatial confinement of the PEDOT/PSS polymer proposed in this work, which exhibits extraordinary low nonspecific interactions and is effectively turned into a selective protein sorbent upon imprinting.

    2. Stooped Nanohairs: Geometry-Controllable, Unidirectional, Reversible, and Robust Gecko-like Dry Adhesive (pages 2276–2281)

      Tae-il Kim, Hoon Eui Jeong, Kahp Y. Suh and Hong H. Lee

      Version of Record online: 25 MAR 2009 | DOI: 10.1002/adma.200803710

      Thumbnail image of graphical abstract

      A simple yet robust method to fabricate an array of stooped nanohairs is presented, with a proper choice of material and post e-beam exposure even for an aspect ratio of 10. The stooped nanohairs have the unidirectional feature of frictional adhesion with a remarkably high adhesion force (∼11 N cm−2).

    3. Electronic Manifestation of Cation-Vacancy-Induced Magnetic Moments in a Transparent Oxide Semiconductor: Anatase Nb:TiO2 (pages 2282–2287)

      Shixiong Zhang, Satishchandra B. Ogale, Weiqiang Yu, Xingyu Gao, Tao Liu, Saurabh Ghosh, Gour P. Das, Andrew T. S. Wee, Richard L. Greene and Thirumalai Venkatesan

      Version of Record online: 23 MAR 2009 | DOI: 10.1002/adma.200803019

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      Nb-doped anatase TiO2 thin films grown by pulsed-laser deposition show Kondo scattering in elctronic-transport measurements, providing evidence for the formation of magnetic moments. The origin of magnetism is attributed to cation (Ti) vacancies, confirmed by X-ray absorption spectroscopy and first-principle calculations. The Ti vacancies are controlled by oxygen partial pressure during growth.

    4. Synthesis and Structural Characterization of Branched Palladium Nanostructures (pages 2288–2293)

      John Watt, Neil Young, Sarah Haigh, Angus Kirkland and Richard D. Tilley

      Version of Record online: 14 APR 2009 | DOI: 10.1002/adma.200900272

      Thumbnail image of graphical abstract

      The controlled formation of branched palladium nanostructures has been performed using a simple reaction procedure carried out at room temperature. Structural characterization of an as-synthesized palladium tripod gives an insight into anisotropic growth occurring from highly symmetrical face centered cubic crystal structures.

    5. Precise Structure of Pentacene Monolayers on Amorphous Silicon Oxide and Relation to Charge Transport (pages 2294–2298)

      Stefan C. B. Mannsfeld, Ajay Virkar, Colin Reese, Michael F. Toney and Zhenan Bao

      Version of Record online: 19 MAR 2009 | DOI: 10.1002/adma.200803328

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      The precise molecular packing in pentacene monolayers on silicon oxide is determined for the first time using a combination of grazing incidence X-ray diffraction (GIXD) and crystallographic refinement calculations. The pentacene molecules are found to adopt a completely tilt-free herringbone motif, the charge-transport properties of which are discussed on the basis of density functional theory calculations.

    6. Cross-Stacked Carbon Nanotube Sheets Uniformly Loaded with SnO2 Nanoparticles: A Novel Binder-Free and High-Capacity Anode Material for Lithium-Ion Batteries (pages 2299–2304)

      Hao-Xu Zhang, Chen Feng, Yong-Chao Zhai, Kai-Li Jiang, Qun-Qing Li and Shou-Shan Fan

      Version of Record online: 19 MAR 2009 | DOI: 10.1002/adma.200802290

      Thumbnail image of graphical abstract

      SnO2–carbon nanotube (CNT) composite sheets are synthesized using poly(vinylpyrrolidone) to uniformly load a monolayer of SnO2 nanoparticles onto the surfaces of CNTs and CNT bundles within cross-stacked CNT sheets. When they are used as high-capacity (over 850 mA h g–1) and binder-free anodes in rechargeable lithium-ion batteries, they exhibit good cycle performance, as shown in the lower portion of the figure.

    7. Sharp Carbon-Nanotube Tips and Carbon-Nanotube Soldering Irons (pages 2305–2308)

      Abha Misra and Chiara Daraio

      Version of Record online: 14 NOV 2008 | DOI: 10.1002/adma.200801893

      Thumbnail image of graphical abstract

      The nano-electron beam assisted fabrication of atomically sharp iron-based tips (see figure) and the creation of a nano-soldering iron for nano-interconnects using Fe-filled multiwalled carbon nanotubes (MWCNTs) is reported. The technique allows carving of a MWCNT and a control of the flow of the encapsulated metal outward by regulating the e-beam exposure time and spot size.

    8. Bioimaging with Two-Photon-Induced Luminescence from Triangular Nanoplates and Nanoparticle Aggregates of Gold (pages 2309–2313)

      Yuqiang Jiang, Noriko Nishizawa Horimoto, Kohei Imura, Hiromi Okamoto, Ko Matsui and Ryuichi Shigemoto

      Version of Record online: 19 MAR 2009 | DOI: 10.1002/adma.200802312

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      Cell imaging with two-photon-induced photoluminescence is demonstrated using gold nanoparticles (either triangular nanoplates or nanosphere aggregates) as imaging agents. On being conjugated to yeast cells, gold nanoplates exhibit visible two-photon excited luminescence that can be detected by two-photon laser scanning microscopy. The cells can be either dried (in the air) or alive (in water).

    9. Orthogonal Patterning of PEDOT:PSS for Organic Electronics using Hydrofluoroether Solvents (pages 2314–2317)

      Priscilla G. Taylor, Jin-Kyun Lee, Alexander A. Zakhidov, Margarita Chatzichristidi, Hon Hang Fong, John A. DeFranco, George G. Malliaras and Christopher K. Ober

      Version of Record online: 19 MAR 2009 | DOI: 10.1002/adma.200803291

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      By employing benign process solvents and specially tailored photopolymers, organic electronic materials can be lithographically patterned. Furthermore, because the process is acid stable, this is an ideal candidate for patterning acidic PEDOT:PSS, an important material for organic electronics. Fabrication of a multilayer OTFT demonstrates the potential of this orthogonal patterning process.

    10. Organometallic Complexes for Nonlinear Optics. 45. Dispersion of the Third-Order Nonlinear Optical Properties of Triphenylamine-Cored Alkynylruthenium Dendrimers (pages 2318–2322)

      Rachel L. Roberts, Torsten Schwich, T. Christopher Corkery, Marie P. Cifuentes, Katy A. Green, Julian D. Farmer, Paul J. Low, Todd B. Marder, Marek Samoc and Mark G. Humphrey

      Version of Record online: 25 MAR 2009 | DOI: 10.1002/adma.200803669

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      An alkynylruthenium dendrimer exhibits two-photon absorption behavior below 1000 nm, and a nonlinear increase in nonlinearity upon dendrimer growth. Beyond 1000 nm, it undergoes 3PA-induced photochemistry. Its nonlinear optical performance is an order of magnitude greater than that of similar organic dendrimers, demonstrating the performance enhancement possible upon incorporation of metal centers into a molecular architecture.

    11. Robust and Responsive Dendrimer–Gold Nanoparticle Nanocomposites via Dithiocarbamate Crosslinking (pages 2323–2327)

      Myoung-Hwan Park, Yuval Ofir, Bappaditya Samanta and Vincent M. Rotello

      Version of Record online: 8 JUN 2009 | DOI: 10.1002/adma.200803368

      Thumbnail image of graphical abstract

      A simple and reliable one-step technique is developed to form robust PAMAM dendrimer–gold nanoparticle nanocomposites using dithiocarbamate-based chemistry. The interparticle spacing and optical properties of films can be readily tuned by controlling the dendrimer generation and/or the mole ratio between dendrimers and nanoparticles. The technique is also used to obtain patterned materials on prepatterned surfaces.

    12. Synthesis of Large-Area Graphene Layers on Poly-Nickel Substrate by Chemical Vapor Deposition: Wrinkle Formation (pages 2328–2333)

      Seung Jin Chae, Fethullah Güneş, Ki Kang Kim, Eun Sung Kim, Gang Hee Han, Soo Min Kim, Hyeon-Jin Shin, Seon-Mi Yoon, Jae-Young Choi, Min Ho Park, Cheol Woong Yang, Didier Pribat and Young Hee Lee

      Version of Record online: 19 MAR 2009 | DOI: 10.1002/adma.200803016

      Thumbnail image of graphical abstract

      Large-area, few-layer graphene is grown on a poly-nickel substrate using optimized CVD conditions. High temperature, short growth time, and an optimal gas mixing ratio (C2H2/H2 = 2/45) are found to be necessary to synthesize highly crystalline few-layer grapheme, which may find applications in electronic devices. The wrinkles that are observed under all growth conditions are proposed to be formed by two processes.

    13. Light-Induced Content Release from Plasmon-Resonant Liposomes (pages 2334–2338)

      Timothy S. Troutman, Sarah J. Leung and Marek Romanowski

      Version of Record online: 23 MAR 2009 | DOI: 10.1002/adma.200900018

      Thumbnail image of graphical abstract

      Thermosenstive liposomes coated with gold form plasmon-resonant shells with optical resonances tunable in the near-infrared range. When exposed to laser light, these liposomes release their content in a spectrally-dependent manner. Spectrally addressable release may find applications in the delivery of diagnostic and therapeutic agents, or more broadly, in developing a technological basis of nanomedicine.

  6. Research News

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Communications
    7. Research News
    8. Index
    1. Radical Polymers for Organic Electronic Devices: A Radical Departure from Conjugated Polymers? (pages 2339–2344)

      Kenichi Oyaizu and Hiroyuki Nishide

      Version of Record online: 26 MAR 2009 | DOI: 10.1002/adma.200803554

      Thumbnail image of graphical abstract

      Radical polymers are aliphatic or nonconjugated polymers bearing organic robust radicals as pendant groups per repeating unit. A large population of the radical redox sites allows efficient redox gradient-driven and/or electric-field-driven electron transport through the polymer layer. Radical polymers are emerging as a new class of materials useful for energy storage, transport, and conversion devices.

  7. Index

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Communications
    7. Research News
    8. Index

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