Advanced Materials

Cover image for Vol. 22 Issue 15

April 18, 2010

Volume 22, Issue 15

Pages 1667–1770

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Review
    7. Communications
    1. Biocompatible Films: Rapid Nanoimprinting of Silk Fibroin Films for Biophotonic Applications (Adv. Mater. 15/2010)

      Jason J. Amsden, Peter Domachuk, Ashwin Gopinath, Robert D. White, Luca Dal Negro, David L. Kaplan and Fiorenzo G. Omenetto

      Version of Record online: 15 APR 2010 | DOI: 10.1002/adma.201090050

      Thumbnail image of graphical abstract

      Natural silk fibers provide the raw material to constitute biocompatible films with favorable properties for nanopatterning and device integration. The image shows a free-standing credit-card sized film constituted entirely by silk and containing a number of diffractive optics (lenses, microlens arrays, gratings, phase masks). Such elements can be obtained either by casting or rapid nanoimprinting of silk films (master courtesy of Tessera Inc.). Further details can be found in the Communication by Fiorenzo Omenetto and co-workers on p. 1746.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Review
    7. Communications
    1. Direct Laser Writing: Direct Laser Writing of Complementary Logic Gates and Lateral p–n Diodes in a Solution-Processible Monolithic Organic Semiconductor (Adv. Mater. 15/2010)

      Jean Charles Ribierre, Takashi Fujihara, Satoshi Watanabe, Mutsuyoshi Matsumoto, Tsuyoshi Muto, Aiko Nakao and Tetsuya Aoyama

      Version of Record online: 15 APR 2010 | DOI: 10.1002/adma.201090051

      Thumbnail image of graphical abstract

      Jean-Charles Ribierre and co-workers report on the conversion of the majority carrier type by laser irradiation in solution-processed organic thin films based on a quinoidal oligothiophene derivative (p. 1722). Patterning of p-type and n-type microstructures is achieved by direct laser writing and can be visualized using a Kelvin-probe force microscope. The method is extremely promising for the fabrication of CMOS logic circuits and lateral p-n diodes based on a monolithic solution-processible organic semiconductor.

  3. Contents

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

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Review
    7. Communications
    1. Recent Advances in Research on Carbon Nanotube–Polymer Composites (pages 1672–1688)

      Michele T. Byrne and Yurii K. Gun'ko

      Version of Record online: 25 NOV 2009 | DOI: 10.1002/adma.200901545

      Thumbnail image of graphical abstract

      Carbon nanotube–polymer composites have been developed in recent years as potential alternative materials for various applications, including flexible electrodes in displays (see image), bullet-proof vests, and high-performance composites for aircraft industries. In this article, the most recent progress on the development of carbon nanotube–polymer composites is presented, with particular attention to their mechanical and electrical (conductive) properties.

  5. Review

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Review
    7. Communications
    1. Single-Molecule Spectroscopy for Plastic Electronics: Materials Analysis from the Bottom-Up (pages 1689–1721)

      John M. Lupton

      Version of Record online: 21 DEC 2009 | DOI: 10.1002/adma.200902306

      Thumbnail image of graphical abstract

      Single-molecule spectroscopy provides a powerful approach to unraveling intrinsic material properties from the bottom up. Building on the success in life sciences, such techniques are now finding increasing applicability in materials science, effectively enabling the dissection of the bulk down to the level of the individual molecular constituent. This article reviews recent progress in single-molecule spectroscopy of conjugated polymers as used in organic electronics (see figure).

  6. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Review
    7. Communications
    1. Direct Laser Writing of Complementary Logic Gates and Lateral p–n Diodes in a Solution-Processible Monolithic Organic Semiconductor (pages 1722–1726)

      Jean Charles Ribierre, Takashi Fujihara, Satoshi Watanabe, Mutsuyoshi Matsumoto, Tsuyoshi Muto, Aiko Nakao and Tetsuya Aoyama

      Version of Record online: 7 JAN 2010 | DOI: 10.1002/adma.200903152

      Thumbnail image of graphical abstract

      Complementary organic logic circuits and lateral bipolar microstructures with specified p- and n-region profiles can be patterned by direct laser writing in solution- processed thin films faricated from a quinoidal oligothiophene derivative. To demonstrate the versatility of this method, the fabrication of NAND and NOR logic gates as well as a gate-modulated lateral p-n diode is reported (see figure).

    2. Conducting Polymer Composite Materials for Hydrogen Generation (pages 1727–1730)

      Bjorn Winther-Jensen, Kevin Fraser, Chun Ong, Maria Forsyth and Douglas R. MacFarlane

      Version of Record online: 11 JAN 2010 | DOI: 10.1002/adma.200902934

      Thumbnail image of graphical abstract

      A novel conducting polymer/non-conducting polymer composite (PEDOT/PEG), produced by vapor phase polymerization of PEDOT in the presence of PEG, shows stable electrocatalytic reduction of protons to hydrogen with conversion currents and over-potential comparable to platinum. The swelling of the composite by PEG and especially its ability to coordinate protons seems to be essential for the catalytic activity of the composite.

    3. Conjugated-Polymer-Functionalized Graphene Oxide: Synthesis and Nonvolatile Rewritable Memory Effect (pages 1731–1735)

      Xiao-Dong Zhuang, Yu Chen, Gang Liu, Pei-Pei Li, Chun-Xiang Zhu, En-Tang Kang, Koon-Gee Noeh, Bin Zhang, Jin-Hui Zhu and Yong-Xi Li

      Version of Record online: 7 JAN 2010 | DOI: 10.1002/adma.200903469

      Thumbnail image of graphical abstract

      An ITO/TPAPAM-GO/Al memory device (see figure; ITO = indium tin oxide, TPAPAM-GO = graphene oxide covalently grafted with triphenylamine-based polyazomethine) exhibits typical bistable electrical switching and a nonvolatile rewritable memory effect with a turn-on voltage of −1.0 V and an ON/OFF-state current ratio of more than 103. Both ON and OFF state are stable under a constant voltage stress and survive up to 108 read cycles at a read voltage of −1.0 V.

    4. Biocompatible, Robust Free-Standing Paper Composed of a TWEEN/Graphene Composite (pages 1736–1740)

      Sungjin Park, Nihar Mohanty, Ji Won Suk, Ashvin Nagaraja, Jinho An, Richard D. Piner, Weiwei Cai, Daniel R. Dreyer, Vikas Berry and Rodney S. Ruoff

      Version of Record online: 7 JAN 2010 | DOI: 10.1002/adma.200903611

      Thumbnail image of graphical abstract

      A stable, biocompatible, free-standing “paperlike” material composed of polyoxyethylene sorbitan laurate (TWEEN) and reduced graphene oxide platelets is presented. The TWEEN paper is highly stable in water (no leakage of TWEEN) and sufficiently robust to be handled by hand without breaking (see image). Furthermore, the material is noncytotoxic to three mammalian cell lines and inhibits nonspecific binding of Gram-positive bacteria.

    5. Multiple NaNbO3/Nb2O5 Heterostructure Nanotubes: A New Class of Ferroelectric/Semiconductor Nanomaterials (pages 1741–1745)

      Chenglin Yan, Liliya Nikolova, Afshin Dadvand, Catalin Harnagea, Andranik Sarkissian, Dmitrii F. Perepichka, Dongfeng Xue and Federico Rosei

      Version of Record online: 9 FEB 2010 | DOI: 10.1002/adma.200903589

      Thumbnail image of graphical abstract

      Multiple NaNbO3 nanoplates are created within Nb2O5 nanotubes forming a unique class of heterostructure nanotubes combining ferroelectric and semiconducting nanomaterials. Local piezoelectric studies on NaNbO3 nanoplates show clear ferroelectric behavior (see figure), while the semiconductive properties of the host Nb2O5 nanotubes allows for switching of electrical conductivity by an external electric field.

    6. Rapid Nanoimprinting of Silk Fibroin Films for Biophotonic Applications (pages 1746–1749)

      Jason J. Amsden, Peter Domachuk, Ashwin Gopinath, Robert D. White, Luca Dal Negro, David L. Kaplan and Fiorenzo G. Omenetto

      Version of Record online: 18 JAN 2010 | DOI: 10.1002/adma.200903166

      Thumbnail image of graphical abstract

      With soft micro- and nanopatterned materials becoming increasingly useful for various, optical, mechanical, electronic, microfluidic, and optofluidic devices, the extension of this paradigm to a pure protein-based material substrate provides entirely new options for such devices. Silk fibroin combines the properties of an ideal nanoimprint resist with superior optical quality and biocompatibility making it a new technology platform that seamlessly combines nanophotonics, biopolymeric, and biocompatible materials.

    7. Thermally Induced Failure of Polymer Dielectrics (pages 1750–1753)

      Ross S. Johnson, Kirsten N. Cicotte, Patrick J. Mahoney, Bruce A. Tuttle and Shawn M. Dirk

      Version of Record online: 11 JAN 2010 | DOI: 10.1002/adma.200903617

      Thumbnail image of graphical abstract

      Halogen precursor polymers to poly[(2,3-diphenyl-p-phenylene)vinylene] (DP-PPV) are examined for use as advanced capacitor dielectrics. The polymer is demonstrated to function as a good dielectric until it reaches a set temperature determined by the stability of the leaving groups. Conjugation of the polymer backbone at high temperature effectively disables the capacitor, providing a ‘built-in’ safety mechanism for electronic devices. Conducting Polymers.

    8. Metal–Insulator–Metal Optical Nanoantenna with Equivalent-Circuit Analysis (pages 1754–1758)

      Yeonho Choi, Dukhyun Choi and Luke P. Lee

      Version of Record online: 8 FEB 2010 | DOI: 10.1002/adma.200903443

      Thumbnail image of graphical abstract

      Selective metal–insulator–metal optical nanoantennas are fabricated with Au deposition on top of anodic aluminum oxide layer (see figure). The complicated nanoantennas are easily analyzed by using an equivalent-circuit system and characterized by surface-enhanced Raman scattering.

    9. Double-Layered NiO Photocathodes for p-Type DSSCs with Record IPCE (pages 1759–1762)

      Lin Li, Elizabeth A. Gibson, Peng Qin, Gerrit Boschloo, Mikhail Gorlov, Anders Hagfeldt and Licheng Sun

      Version of Record online: 13 JAN 2010 | DOI: 10.1002/adma.200903151

      Thumbnail image of graphical abstract

      A way to achieve a high-efficiency dye-sensitized solar cell is to combine an n-type TiO2-based photoanode with a p-type photocathode in a tandem configuration. The development of an efficient photocathode is, at present, the key target. We have optimized the NiO, I3/I p-DSSC system to obtain record photocurrent, giving 64% incident photon-to-current conversion efficiency (IPCE) and 5.48 mAcm−2JSC.

    10. Bulk Photovoltaic Effect at Visible Wavelength in Epitaxial Ferroelectric BiFeO3 Thin Films (pages 1763–1766)

      Wei Ji, Kui Yao and Yung C. Liang

      Version of Record online: 21 DEC 2009 | DOI: 10.1002/adma.200902985

      Thumbnail image of graphical abstract

      Appreciable photovoltaic responses to visible light are observed in epitaxial ferroelectric BiFeO3 thin films by sputtering deposition. The photocurrent direction is opposite to the BiFeO3 polarization vector and can be switched by poling the films in different directions (see figure). The as-deposited films are strongly self-polarized, exhibiting significant photovoltaic response before any electrical poling process.

    11. Selective Formation and Efficient Photocurrent Generation of [70]Fullerene–Single-Walled Carbon Nanotube Composites (pages 1767–1770)

      Tomokazu Umeyama, Noriyasu Tezuka, Shu Seki, Yoshihiro Matano, Masayuki Nishi, Kazuyuki Hirao, Heli Lehtivuori, Nikolai V. Tkachenko, Helge Lemmetyinen, Yoshihide Nakao, Shigeyoshi Sakaki and Hiroshi Imahori

      Version of Record online: 11 JAN 2010 | DOI: 10.1002/adma.200903056

      Thumbnail image of graphical abstract

      For the first time nanocarbon composites with C70 molecules aligned on the sidewall of single-walled carbon nanotubes (SWNTs) are demonstrated. The C70–SWNT photoelectrochemical devices exhibit efficient photocurrent generation properties that result from selective formation of a single composite film consisting of a SWNT network covered with C70 molecules and high electron mobility through the C70–SWNT network.

SEARCH

SEARCH BY CITATION