Advanced Materials

Cover image for Vol. 22 Issue 11

March 19, 2010

Volume 22, Issue 11

Pages 1171–1287

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correspondence
    6. Progress Report
    7. Review
    8. Frontispiece
    9. Communications
    1. Silica-Coated Nanomaterials: Recent Progress on Silica Coating of Nanoparticles and Related Nanomaterials (Adv. Mater. 11/2010)

      Andrés Guerrero-Martínez, Jorge Pérez-Juste and Luis M. Liz-Marzán

      Article first published online: 22 MAR 2010 | DOI: 10.1002/adma.201090031

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      At different size scales, the Earth and silica-coated nanoparticles possess similar structure and properties. On p. 1182 Andrés Guerrero-Martínez, Luis Liz-Marzán and co-workers present recent progress in the field of silica-coated nanomaterials. The cover image reflects the physical properties (magnetic, catalytic, and photophysical, with the sun as a light source) of the Earth, in combination with its outer bio-shell.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correspondence
    6. Progress Report
    7. Review
    8. Frontispiece
    9. Communications
    1. Organic Memory: Rewritable Switching of One Diode–One Resistor Nonvolatile Organic Memory Devices (Adv. Mater. 11/2010)

      Byungjin Cho, Tae-Wook Kim, Sunghoon Song, Yongsung Ji, Minseok Jo, Hyunsang Hwang, Gun-Young Jung and Takhee Lee

      Article first published online: 22 MAR 2010 | DOI: 10.1002/adma.201090032

      Thumbnail image of graphical abstract

      Takhee Lee and co-workers demonstrate on p. 1228 that hybrid-type one-diode and one-resistor (1D-1R) memory devices consisting of inorganic Schottky diodes and organic unipolar memory show electrically rewritable switching characteristics as well as rectifying properties. The 1D-1R array architecture improves the reading efficiency of the array memory cell, ultimately creating the possibility for high-density integrated organic memory devices without cross-talk interference between cells.

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correspondence
    6. Progress Report
    7. Review
    8. Frontispiece
    9. Communications
    1. Contents: (Adv. Mater. 11/2010) (pages 1171–1176)

      Article first published online: 22 MAR 2010 | DOI: 10.1002/adma.201090033

  4. Correspondence

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

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correspondence
    6. Progress Report
    7. Review
    8. Frontispiece
    9. Communications
    1. Recent Progress on Silica Coating of Nanoparticles and Related Nanomaterials (pages 1182–1195)

      Andrés Guerrero-Martínez, Jorge Pérez-Juste and Luis M. Liz-Marzán

      Article first published online: 4 JAN 2010 | DOI: 10.1002/adma.200901263

      Thumbnail image of graphical abstract

      Novel strategies for silica coating of inorganic nanoparticles and organic nanomaterials differ from classical materials science methodologies. Silica is a coating material with unparalleled potential for enhancement of colloidal properties and functions. A brief overview is presented of various methods recently developed for silica coating of nanomaterials and their impact in areas such as spectroscopy, magnetism, catalysis, and biology.

  6. Review

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correspondence
    6. Progress Report
    7. Review
    8. Frontispiece
    9. Communications
    1. New Frontiers in Materials Science Opened by Ionic Liquids (pages 1196–1221)

      Tsukasa Torimoto, Tetsuya Tsuda, Ken-ichi Okazaki and Susumu Kuwabata

      Article first published online: 4 DEC 2009 | DOI: 10.1002/adma.200902184

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      Ionic liquids, which exhibit unusual physicochemical properties, such as negligible vapor pressure and high ionic conductivity, are a revolutionary liquid material as well as a state-of-the-art solvent. In recent years, research in ionic liquid science and technology has produced many novel functional materials and related analytical methods. In this Review, some of these new developments are introduced from the materials science perspective.

  7. Frontispiece

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correspondence
    6. Progress Report
    7. Review
    8. Frontispiece
    9. Communications
    1. Plasmonic Nanowire Antennae: Conjugated Polymer/Metal Nanowire Heterostructure Plasmonic Antennas (Adv. Mater. 11/2010)

      Deirdre M. O'Carroll, Carrie E. Hofmann and Harry A. Atwater

      Article first published online: 22 MAR 2010 | DOI: 10.1002/adma.201090034

      Thumbnail image of graphical abstract

      A full-wave plasmonic nanowire antenna is excited into resonance by a dipole emitter located within a polythiophene nanoparticle attached to the end of the antenna in work reported by Deirdre O'Carroll and co-workers on p. 1223. The frontispiece shows an electric field intensity cross-section through the nanoparticle-antenna structure.

  8. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correspondence
    6. Progress Report
    7. Review
    8. Frontispiece
    9. Communications
    1. Conjugated Polymer/Metal Nanowire Heterostructure Plasmonic Antennas (pages 1223–1227)

      Deirdre M. O'Carroll, Carrie E. Hofmann and Harry A. Atwater

      Article first published online: 15 DEC 2009 | DOI: 10.1002/adma.200902024

      Thumbnail image of graphical abstract

      The spontaneous emission spectrum, polarization direction, and emission lifetime of monolithically coupled poly-(3-hexylthiophene), P3HT, light-emitting nanostructures are modified by gold nanowire antennas. The P3HT nanostructure is integrated onto the end of the gold nanowire antenna, where localized, longitudinal surface plasmon mode fields are strongest. Comprehensive optical characterization and theoretical modeling are employed to demonstrate plasmonic nanoantenna-mediated light emission from P3HT.

    2. Rewritable Switching of One Diode–One Resistor Nonvolatile Organic Memory Devices (pages 1228–1232)

      Byungjin Cho, Tae-Wook Kim, Sunghoon Song, Yongsung Ji, Minseok Jo, Hyunsang Hwang, Gun-Young Jung and Takhee Lee

      Article first published online: 14 DEC 2009 | DOI: 10.1002/adma.200903203

      Thumbnail image of graphical abstract

      One diode–one resistor (1D–1R) hybrid-type devices consisting of an inorganic Schottky diode and an organic unipolar memory show electrically rewritable switching characteristics as well as rectifying properties. The 1D–1R array architecture improves the sensing efficiency of the array memory cell, ultimately creating the possibility for high-density integrated organic memory devices without restrictions due to cross-talk between cells.

    3. Relationship between Crystalline Order and Exciton Diffusion Length in Molecular Organic Semiconductors (pages 1233–1236)

      Richard R. Lunt, Jay B. Benziger and Stephen R. Forrest

      Article first published online: 1 DEC 2009 | DOI: 10.1002/adma.200902827

      Thumbnail image of graphical abstract

      The effect of crystalline order on the exciton diffusion length (LD) is shown for the archetypal organic semiconductor 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA; see figure). LD increases from ∼6.5 nm in the amorphous limit to ∼25 nm for single crystals. These changes in diffusion length are connected to changes in the fluorescence quantum yield, which is useful for understanding where crystal-size-dependant diffusion trends are likely to be observed for other organic materials.

    4. Amplification of Fluorescent Contrast by Photonic Crystals in Optical Storage (pages 1237–1241)

      Heng Li, Jingxia Wang, Hui Lin, Liang Xu, Wei Xu, Rongming Wang, Yanlin Song and Daoben Zhu

      Article first published online: 15 DEC 2009 | DOI: 10.1002/adma.200903105

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      Photonic Memory: A facile approach to amplifying fluorescent contrast by introducing photonic crystals (PCs) into optical memory is demonstrated. The fluorescence image on the PC exhibits both higher brightness and contrast compared with that on the glass. The amplification of fluorescent contrast can provide much better sensitivity and resolution, which will be of great significance for developing high-contrast optical storage.

    5. Multiplexed Protein Patterns on a Photosensitive Hydrophilic Polymer Matrix (pages 1242–1246)

      Parijat Bhatnagar, George G. Malliaras, Il Kim and Carl A. Batt

      Article first published online: 16 DEC 2009 | DOI: 10.1002/adma.200903255

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      A photosensitive hydrogel film containing a photocleavable protecting group is attached to silicon oxide. Projection photolithography is used to generate carboxylic groups in selective patterns on this film, to which proteins are coupled through their primary amine groups. The carboxylic groups on the proteins are chemically protected and the process is repeated to sequentially pattern additional proteins on the hydrogel surface.

    6. Versatile Carbon Hybrid Films Composed of Vertical Carbon Nanotubes Grown on Mechanically Compliant Graphene Films (pages 1247–1252)

      Duck Hyun Lee, Ji Eun Kim, Tae Hee Han, Jae Won Hwang, Seokwoo Jeon, Sung-Yool Choi, Soon Hyung Hong, Won Jong Lee, Rodney S. Ruoff and Sang Ouk Kim

      Article first published online: 13 JAN 2010 | DOI: 10.1002/adma.200903063

      Thumbnail image of graphical abstract

      A hybrid system with vertical carbon nanotubes (CNTs) grown on reduced graphene films composed of overlapping and reduced graphene oxide platelets is reported. Such carbon hybrid films have excellent flexibility and stretchability (see image), can be readily transferred to any substrate including nonplanar surfaces, and were found to have Ohmic electrical contacts throughout all junctions in the CNT/metal-catalyst/graphene-film system.

    7. A Thermally Stable Semiconducting Polymer (pages 1253–1257)

      Shinuk Cho, Jung Hwa Seo, Sung Heum Park, Serge Beaupré, Mario Leclerc and Alan J. Heeger

      Article first published online: 28 DEC 2009 | DOI: 10.1002/adma.200903420

      Thumbnail image of graphical abstract

      The thermal stability of the poly(2,7-carbazole) derivative (PCDTBT) is investigated. UV–visible absorption spectra and X-ray photoelectron spectroscopy data demonstrate that the electronic structure of PCDTBT is stable in air at annealing temperatures up to 150 °C and in N2 even after exposure to temperatures up to 350 °C. Field-effect transistors fabricated with PCDTBT show stable characteristics and hole mobility up to 150 °C (air) and 350 °C (N2).

    8. Protein-Mediated Synthesis of Nanostructured Titania with Different Polymorphs at Room Temperature (pages 1258–1262)

      Ge Chen, Min Li, Fan Li, Shaorui Sun and Dingguo Xia

      Article first published online: 22 DEC 2009 | DOI: 10.1002/adma.200902901

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      Enzymes are demonstrated to catalyze the hydrolysis and polycondensation of titanium precursors at room temperature to form nanocrystalline TiO2 with different polymorphs. By the unique combination of enzyme and titanium precursor, nanostructured rutile, anatase, and mixed phases of monoclinic β-TiO2 and anatase are obtained.

    9. Spontaneous Self-Folding in Confined Ultrathin Polymer Gels (pages 1263–1268)

      Srikanth Singamaneni, Michael E. McConney and Vladimir V. Tsukruk

      Article first published online: 4 JAN 2010 | DOI: 10.1002/adma.200903052

      Thumbnail image of graphical abstract

      The formation of high-aspect folded structures with uniform feature sizes in responsive gel films are described. The folding patterns observed here in ultrathin films (20–100 nm) are strikingly different compared to the smooth sinusoidal buckling and cusp-shaped singularities observed earlier in relatively thick (a few tens of micrometers to a few millimeters) and stiffer films.

    10. Constructing Carbon Nanotube/Pt Nanoparticle Hybrids Using an Imidazolium-Salt-Based Ionic Liquid as a Linker (pages 1269–1272)

      Shaojun Guo, Shaojun Dong and Erkang Wang

      Article first published online: 4 JAN 2010 | DOI: 10.1002/adma.200903379

      Thumbnail image of graphical abstract

      Carbon nanotube (CNT)/Pt nanoparticle (NP) hybrids are synthesized at room temperature using an imidazolium-salt-based ionic liquid (IS-ILs) as a linker. The new three-component CNT/IS-ILs/metal heterostructure has uniformly distributed Pt NPs, which form a conducting network on the CNTs that leads to high electrocatalytic activity. The hybrid is shown to exhibit higher electrocatalytic activity towards methanol oxidation reactions than a commercial hybrid catalyst and a hybrid containing polymeric linkers.

    11. Solvent-Assisted Re-annealing of Polymer Films for Solution-Processable Organic Field-Effect Transistors (pages 1273–1277)

      Chong-an Di, Kun Lu, Lei Zhang, Yunqi Liu, Yunlong Guo, Xiangnan Sun, Yugeng Wen, Gui Yu and Daoben Zhu

      Article first published online: 20 NOV 2009 | DOI: 10.1002/adma.200902813

      Thumbnail image of graphical abstract

      The introduction of solvent to a polymer film, which is generally believed to have a negative influence on device performance, is an effective way for improving device performances of polymer organic field-effect transistors (OFETs) if the treatment is combined with a re-annealing process and film-thickness optimization. The so-called solvent-assisted re-annealing offers a simple and novel approach towards polymer OFETs with excellent device characteristics (see figure).

    12. Solution-Processable Carbon Nanotubes for Semiconducting Thin-Film Transistor Devices (pages 1278–1282)

      Chun Wei Lee, Xuanding Han, Fuming Chen, Jun Wei, Yuan Chen, Mary B. Chan-Park and Lain-Jong Li

      Article first published online: 13 JAN 2010 | DOI: 10.1002/adma.200902461

      Thumbnail image of graphical abstract

      CoMoCat single-walled carbon nanotubes (SWNTs) treated with diazonium salts can be used to fabricate solution-processable field-effect transistors (FETs) with a full semiconductor device yield. By increasing the network thickness, the effective mobility of the devices can be raised to ∼10 cm2 V−1 s−1 while keeping the on–off ratio higher than 5000. The removal of impurities is essential to achieve high-on–off-ratio devices. This approach is promising for preparation of SWNT inks for printing high-performance devices in flexible electronics.

    13. Self-Assembly of Peptide-Inorganic Hybrid Spheres for Adaptive Encapsulation of Guests (pages 1283–1287)

      Xuehai Yan, Pengli Zhu, Jinbo Fei and Junbai Li

      Article first published online: 21 DEC 2009 | DOI: 10.1002/adma.200901889

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      Versatile hybrid colloidal spheres, self-assembled through the association of cationic peptide and polyoxometalate clusters, are not only responsive towards external stimuli but also show novel, adaptive inclusion properties. The adaptive nature of hybrid colloidal spheres is utilized to encapsulate a wide variety of guest materials ranging from water-soluble molecules to hydrophobic nanoparticles and hydrophilic inorganic nanoparticles.

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