Advanced Materials

Cover image for Vol. 21 Issue 13

April 6, 2009

Volume 21, Issue 13

Pages 1303–1388

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correspondence
    6. Comments
    7. Review Article
    8. Communications
    9. Research News
    10. Index
    1. Carbon Nanotube Field-Effect Transistors: Towards Entire-Carbon-Nanotube Circuits: The Fabrication of Single-Walled-Carbon-Nanotube Field-Effect Transistors with Local Multiwalled-Carbon-Nanotube Interconnects (Adv. Mater. 13/2009)

      Xuelei Liang, Sheng Wang, Xianlong Wei, Li Ding, Yuzhen Zhu, Zhiyong Zhang, Qing Chen, Yan Li, Jin Zhang and Lian-Mao Peng

      Version of Record online: 30 MAR 2009 | DOI: 10.1002/adma.200990042

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      Towards entire carbon nanotube (CNT) circuits: single-walled CNTs serve as channels (lowest layer) and multi-walled CNTs serve as interconnects (vertical vias and second/third layers). The polarity of the channel (p- or n-type) was defined by metals with different working functions at the contact points (the yellow and green contacts in the lowest layer). More details on single-walled CNT field-effect transistors with multiwalled CNTs as local interconnects can be found in the article by Xuelei Liang, Lian-Mao Peng, and co-workers on p. 1339.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correspondence
    6. Comments
    7. Review Article
    8. Communications
    9. Research News
    10. Index
    1. Symmetric Wrinkling Patterns: Diffusion-Controlled, Self-Organized Growth of Symmetric Wrinkling Patterns (Adv. Mater. 13/2009)

      Jun Young Chung, Adam J. Nolte and Christopher M. Stafford

      Version of Record online: 30 MAR 2009 | DOI: 10.1002/adma.200990043

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      Irradiation of thin polystyrene films leads to the formation of a stiff skin layer, which can dynamically wrinkle under osmotic swelling of a small molecule penetrant from localized defects in the film. As shown by Christopher Stafford and co-workers on p. 1358, these wrinkled surfaces display a rich diversity of pattern symmetries that are not readily accessible by any other route.

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correspondence
    6. Comments
    7. Review Article
    8. Communications
    9. Research News
    10. Index
  4. Correspondence

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correspondence
    6. Comments
    7. Review Article
    8. Communications
    9. Research News
    10. Index
    1. Energy Harvesting Using Piezoelectric Nanowires–A Correspondence on “Energy Harvesting Using Nanowires?” by Alexe et al. (pages 1311–1315)

      Zhong Lin Wang

      Version of Record online: 23 DEC 2008 | DOI: 10.1002/adma.200802638

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      A response to the questions raised by Alexe et al. concerning nanowire-based nanogenerators is presented. Evidence is given about the existence and detection of a piezoelectric potential in ZnO nanowires. The role played by the piezoelectric potential is to overcome the threshold voltage at the Pt–ZnO junction, while the observed output signal of ∼10 mV is the difference in Fermi levels between the two electrodes. The measurement system used by Alexe et al. is questioned, as is their model.

  5. Comments

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correspondence
    6. Comments
    7. Review Article
    8. Communications
    9. Research News
    10. Index
    1. Comments on ‘Electric-Field-Assisted Growth of Highly Uniform and Oriented Gold Nanotriangles on Conducting Glass Substrates’ (pages 1317–1319)

      Peng Diao, Dafeng Zhang, Min Guo and Qi Zhang

      Version of Record online: 2 JAN 2009 | DOI: 10.1002/adma.200801390

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      AFM artifacts: Recent results by Sajanlal and Pradeep on the electric-field-assisted growth of highly uniform and oriented gold nanotriangles appear to provide a simple route to the size-, shape-, and orientation-controlled synthesis of nano structures. In our view, however, the triangle patterns observed in the AFM images are not real surface features but artifacts produced by a broken or contaminated AFM tip.

  6. Review Article

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correspondence
    6. Comments
    7. Review Article
    8. Communications
    9. Research News
    10. Index
    1. You have free access to this content
      Polymer-Fullerene Bulk-Heterojunction Solar Cells (pages 1323–1338)

      Gilles Dennler, Markus C. Scharber and Christoph J. Brabec

      Version of Record online: 9 FEB 2009 | DOI: 10.1002/adma.200801283

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      Solution-processed bulk-heterojunction solar cells, their advancement over the past few years, and the current state-of-the-art devices are reviewed here. Photovolatic devices that utilize such technology are highly promising for future low-cost power production. Future materials and methods necessary to obtain 10% efficiency are considered, as is a cost analysis that offsets module costs with low device lifetime and performance.

  7. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correspondence
    6. Comments
    7. Review Article
    8. Communications
    9. Research News
    10. Index
    1. Towards Entire-Carbon-Nanotube Circuits: The Fabrication of Single-Walled-Carbon-Nanotube Field-Effect Transistors with Local Multiwalled-Carbon-Nanotube Interconnects (pages 1339–1343)

      Xuelei Liang, Sheng Wang, Xianlong Wei, Li Ding, Yuzhen Zhu, Zhiyong Zhang, Qing Chen, Yan Li, Jin Zhang and Lian-Mao Peng

      Version of Record online: 19 FEB 2009 | DOI: 10.1002/adma.200802758

      Thumbnail image of graphical abstract

      Single-walled-carbon-nanotube field-effect transistors with multiwalled carbon nanotubes as local interconnects have been fabricated and integrated into a complementary metal oxide-semiconductor inverter. This device prototype sheds light on future integrated circuits made entirely of carbon nanotubes.

    2. Photonic Shell-Crosslinked Nanoparticle Probes for Optical Imaging and Monitoring (pages 1344–1348)

      Nam S. Lee, Guorong Sun, William L. Neumann, John N. Freskos, Jeng J. Shieh, Richard B. Dorshow and Karen L. Wooley

      Version of Record online: 3 FEB 2009 | DOI: 10.1002/adma.200803053

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      A pH-insensitive fluorophore is fabricated to give pH-driven responses through its covalent incorporation within a nanostructure derived from pH-responsive polymers. Fluorophore shell-crosslinked nanoparticles (SCKs) demonstrate notable enhancement of photophysical properties in the physiological pH region. Fluorophore SCKs are designed to swell at higher pH values and shrink as the pH is lowered, producing high fluorescence versus low fluorescence outputs, respectively.

    3. Organic Thin-film Transistors Based on Polythiophene Nanowires Embedded in Insulating Polymer (pages 1349–1353)

      Longzhen Qiu, Wi Hyoung Lee, Xiaohong Wang, Jong Soo Kim, Jung Ah Lim, Donghoon Kwak, Shichoon Lee and Kilwon Cho

      Version of Record online: 30 DEC 2008 | DOI: 10.1002/adma.200802880

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      Blending poly(3-hexylthiophene) (P3HT) and amorphous polystyrene (PS) using a marginal solvent (CH2Cl2) with temperature-dependent solubility allows a reduction of the semiconductor content to as low as 3 wt% without considerable degradation of the field-effect electronic properties. Morphological and structural studies reveal that the P3HT molecules in these blends form highly crystalline, interconnected nanofibrillar networks.

    4. Injectable Superparamagnetic Ferrogels for Controlled Release of Hydrophobic Drugs (pages 1354–1357)

      Jian Qin, Isaac Asempah, Sophie Laurent, Andrea Fornara, Robert N. Muller and Mamoun Muhammed

      Version of Record online: 6 FEB 2009 | DOI: 10.1002/adma.200800764

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      A ferrogel for magnetically controlled release of drugs is prepared by integration of superparamagnetic iron oxide nanoparticles and Pluronic F127 gels. The hydrophobic drug indomethacin is loaded in the ferrogel owing to the oil-in-water micellar structure. The characteristic sol–gel transition property renders the ferrogel an injectable drug carrier that will be, in principle, free from surgical implant procedure.

    5. Diffusion-Controlled, Self-Organized Growth of Symmetric Wrinkling Patterns (pages 1358–1362)

      Jun Young Chung, Adam J. Nolte and Christopher M. Stafford

      Version of Record online: 29 JAN 2009 | DOI: 10.1002/adma.200803209

      Thumbnail image of graphical abstract

      Symmetric instability patterns in the UV-ozone crosslinked surface of a polystyrene film grow radially outward from local defect sites in the presence of solvent vapor. The diffusion kinetics of the solvent governs the pattern morphology by establishing stress fields that favor the orientation of wrinkles in a dendritic-like spoke pattern (left) or in a target pattern consisting of concentric rings (right).

    6. Self-Assembled Perovskite-Fluorite Oblique Nanostructures for Adaptive (Tunable) Electronics (pages 1363–1367)

      Tomoaki Yamada, Cosmin S. Sandu, Maxim Gureev, Vladimir O. Sherman, Andreas Noeth, Paul Muralt, Alexander K. Tagantsev and Nava Setter

      Version of Record online: 29 JAN 2009 | DOI: 10.1002/adma.200800253

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      The relative concentration of BaTiO3 and CeO2 is shown to control the inclination of composite growth. The oblique composite structures consist of tunable BaTiO3 nanofibers embedded in a CeO2 matrix, which lowers considerably the permittivity while significantly enhancing the tunable response to an electric field. This is of interest in reconfigurable microelectronics.

    7. One-Pot Synthesis of Catalytically Stable and Active Nanoreactors: Encapsulation of Size-Controlled Nanoparticles within a Hierarchically Macroporous Core@Ordered Mesoporous Shell System (pages 1368–1372)

      Xiao-Yu Yang, Yu Li, Gustaaf Van Tendeloo, Feng-Shou Xiao and Bao-Lian Su

      Version of Record online: 14 JAN 2009 | DOI: 10.1002/adma.200802914

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      Size-controlled, catalytically active nanoparticles are successfully encapsulated in a one-pot synthesis to form novel hierarchical macroporous core@mesoporous shell structures, where macroporous cores are connected by uniform and ordered mesoporous channels. Most importantly, the encapsulated nanoparticles can be used as “nanoreactors”, with high activities and excellent long-term recycling stability.

    8. Site-Selective Deposition of Metal Nanoparticles on Aligned WO3 Nanotrees for Super-Hydrophilic Thin Films (pages 1373–1376)

      Masachika Shibuya and Masahiro Miyauchi

      Version of Record online: 22 JAN 2009 | DOI: 10.1002/adma.200802918

      Thumbnail image of graphical abstract

      Highly aligned WO3 nanotrees are grown on metal tungsten by a simple hydrothermal reaction. Pd nanoparticles are selectively deposited on the WO3 nanotrees by a photocatalytic reduction reaction. Photocatalytic oxidation activity depends strongly on the position of the deposited Pd nanoparticles, and the WO3 nanotrees with Pd nanoparticles deposited at the bottom position exhibited efficient super-hydrophilicity.

    9. Synthesis of Core/Shell Colloidal Magnetic Zeolite Microspheres for the Immobilization of Trypsin (pages 1377–1382)

      Yonghui Deng, Chunhui Deng, Dawei Qi, Chong Liu, Jia Liu, Xiangmin Zhang and Dongyuan Zhao

      Version of Record online: 12 JAN 2009 | DOI: 10.1002/adma.200801766

      Thumbnail image of graphical abstract

      Magnetic zeolite microspheres are synthesized by combining sol-gel synthesis and vapor-phase transport. The microspheres, which have magnetite cores and crystalline zeolite shells (see figure), exhibit super-paramagnetism and a high adsorption capacity for trypsin. Trypsin-adsorbed microspheres digest proteins very efficiently (in only 15 s) in the presence of microwave radiation.

  8. Research News

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correspondence
    6. Comments
    7. Review Article
    8. Communications
    9. Research News
    10. Index
    1. Supramolecular Crystal Engineering at the Solid–Liquid Interface from First Principles: Toward Unraveling the Thermodynamics of 2D Self-Assembly (pages 1383–1386)

      Carlos-Andres Palma, Massimo Bonini, Thomas Breiner and Paolo Samorì

      Version of Record online: 6 FEB 2009 | DOI: 10.1002/adma.200802068

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      Toward preprogrammed functional 2D self-assembled materials: recent contributions on controlled polymorphism and nanopattern formation at the solid-liquid interface renders it possible to gain semi-quantitative insights into the thermodynamics of physisorption at surfaces, paving the way toward 2D supramolecular crystal engineering.

  9. Index

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correspondence
    6. Comments
    7. Review Article
    8. Communications
    9. Research News
    10. Index

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