Advanced Materials

Cover image for Vol. 21 Issue 36

September 25, 2009

Volume 21, Issue 36

Pages 3615–3711

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    1. Flexible Electronics: Ultrathin Silicon Circuits With Strain-Isolation Layers and Mesh Layouts for High-Performance Electronics on Fabric, Vinyl, Leather, and Paper (Adv. Mater. 36/2009)

      Dae-Hyeong Kim, Yun-Soung Kim, Jian Wu, Zhuangjian Liu, Jizhou Song, Hoon-Sik Kim, Yonggang Y. Huang, Keh-Chih Hwang and John A. Rogers

      Version of Record online: 22 SEP 2009 | DOI: 10.1002/adma.200990139

      Thumbnail image of graphical abstract

      The cover shows a silicon integrated circuit on a paper substrate. The system consists of ultrathin devices electrically and mechanically interconnected with stretchable, serpentine ribbons. A low modulus elastomeric adhesive isolates the circuit from strains associated with bending and folding the paper. This strategy provides a route to high quality electronics on paper, vinyl, leather and other unusual substrates, as reported by John Rogers and co-workers on p. 3703.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    1. Mercury Biosensors: Polydiacetylene–Liposome Microarrays for Selective and Sensitive Mercury(II) Detection (Adv. Mater. 36/2009)

      Jiseok Lee, Hayeon Jun and Jinsang Kim

      Version of Record online: 22 SEP 2009 | DOI: 10.1002/adma.200990140

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      Polydiacetylene (PDA) liposome microarrays have been developed for selective and sensitive mercury detection. The sensors, reported on p. 3674 by Jinsang Kim and co-workers, are designed to produce red fluorescence emission upon binding with Hg2+; when the single-stranded DNA aptamers on the microarray selectively wrap around the mercury ions, the resulting complexes repulse each other. The epoxy-based PDA liposome design is an excellent universal platform that can be readily extended to other sensor designs.

  3. Contents

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

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    1. Hollow Micro/Nanomaterials with Multilevel Interior Structures (pages 3621–3638)

      Yong Zhao and Lei Jiang

      Version of Record online: 2 JUN 2009 | DOI: 10.1002/adma.200803645

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      Hierarchically structured hollow micro/nanomaterials are reviewed and categorized. The 0D multilevel interior structures are classified into macroporous, core@ hollow-shell, multishell, and multichamber structures. Correspondingly, 1D multilevel structures include segmented, wire@tube, multiwalled, and multichannel structures. Some unconventional synthetic strategies are proposed to produce these hollow interior structures. These hollow micro/nanomaterials exhibit outstanding properties that enable them broad applications.

  5. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    1. Entering and Lighting Up Nuclei Using Hollow Chitosan–Gold Hybrid Nanospheres (pages 3639–3643)

      Yong Hu, Qi Chen, Yin Ding, Rutian Li, Xiqun Jiang and Baorui Liu

      Version of Record online: 21 MAY 2009 | DOI: 10.1002/adma.200803682

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      Functional hollow CS–PAA–Au-hybrid nanospheres are prepared in aqueous solution via a one-pot route. These hollow hybrid nanospheres can not only act as drug carriers for intracellular and intranuclear drug delivery, but also act as a contrast agent in cancer-cell imaging, and light up the nucleus. This results in a nanosphere that can execute tumor-cell imaging and anticancer drug delivery at the same time.

    2. Madelung Strain in Cuprate Superconductors – A Route to Enhancement of the Critical Temperature (pages 3644–3648)

      Vladimir Y. Butko, Gennady Logvenov, Natasha Božović, Zoran Radović and Ivan Božović

      Version of Record online: 18 MAY 2009 | DOI: 10.1002/adma.200803850

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      “Madelung Strain” in cuprate films containing metal (M = La1.56Sr0.44CuO4) and insulator (I = La2CuO4) layers: X-ray diffraction shows that, unexpectedly, the volume of unit cell of the top layer adjusts to that of the bottom layer. The effect is due to long-range Coulomb forces; it affects interfacial superconductivity because the critical temperature scales with the unit-cell height.

    3. High-Performance Organic Single-Crystal Transistors and Digital Inverters of an Anthracene Derivative (pages 3649–3653)

      Lang Jiang, Wenping Hu, Zhongming Wei, Wei Xu and Hong Meng

      Version of Record online: 18 MAY 2009 | DOI: 10.1002/adma.200900503

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      Single-crystal disks of di(phenylvinyl) anthracene, micro- or nanometer-sized and flexible, are produced by physical vapor transport. Subsequently, single- crystal transistors are fabricated by the organic ribbon mask method and integrated to produce high-performance inverters. The mobility of the transistors, the mobility anisotropy along different crystal axes of the disks, and the maximum gain of the inverters are reported.

    4. Nanowire-Induced Wurtzite InAs Thin Film on Zinc-Blende InAs Substrate (pages 3654–3658)

      Jiming Bao, David C. Bell, Federico Capasso, Natasha Erdman, Dongguang Wei, Linus Fröberg, Thomas Mårtensson and Lars Samuelson

      Version of Record online: 2 JUL 2009 | DOI: 10.1002/adma.200900617

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      InAs pyramids and platelets on a zinc-blende InAs substrate are found to exhibit a wurtzite crystal structure. Induced by wurtzite InAs nanowires, wurtzite InAs thin film and its associated zinc-blende/wurtzite heterocrystalline heterostructures may open up new opportunities in band-gap engineering and related device applications.

    5. SiO2 Nanoparticle Sequestration via Reactive Functionalization in Holographic Polymer-Dispersed Liquid Crystals (pages 3659–3662)

      John D. Busbee, Abigail T. yuhl, Lalguldi V. Natarajan, Vincent P. Tongdilia, Timothy J. Bunning, Richard A. Vaia and Paul V. Braun

      Version of Record online: 21 MAY 2009 | DOI: 10.1002/adma.200900298

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      Holographic photopolymerization of reactively functionalized silica nanoparticles in polymer/liquid-crystal systems leads to sequestration of the silica nanoparticles in the polymeric domain of holographic polymer-dispersed liquid-crystals Bragg gratings. Excellent dispersion of the nanoparticles maintains the optical properties of the reflection grating without additional scattering while lowering the voltage necessary to switch the state of the grating.

    6. TiO2-Coated Multilayered SnO2 Hollow Microspheres for Dye-Sensitized Solar Cells (pages 3663–3667)

      Jiangfeng Qian, Ping Liu, Yang Xiao, Yan Jiang, Yuliang Cao, Xinping Ai and Hanxi Yang

      Version of Record online: 21 MAY 2009 | DOI: 10.1002/adma.200900525

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      TiO2-coated multilayered SnO2 hollow microspheres exhibit a high overall photoconversion efficiency of ∼5.65% when used for dye-sensitized solar-cell photoelectrodes due to multiple reflecting and scattering of incident light in the hierarchical hollow spherical structure.

    7. Formation of Highly Efficient Dye-Sensitized Solar Cells by Hierarchical Pore Generation with Nanoporous TiO2 Spheres (pages 3668–3673)

      Yong Joo Kim, Mi Hyeon Lee, Hark Jin Kim, Gooil Lim, Young Sik Choi, Nam-Gyu Park, Kyungkon Kim and Wan In Lee

      Version of Record online: 18 MAY 2009 | DOI: 10.1002/adma.200900294

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      Nanoporous TiO2 structures were successfully applied for the fabrication of DSC electrodes, providing high surface areas and large pore sizes at the same time. High photocurrent was induced in these DSCs by great adsorption of dye molecules and efficient electrolyte diffusion, caused by the generated hierarchical pore structures in the TiO2 layer.

    8. Polydiacetylene–Liposome Microarrays for Selective and Sensitive Mercury(II) Detection (pages 3674–3677)

      Jiseok Lee, Hayeon Jun and Jinsang Kim

      Version of Record online: 21 MAY 2009 | DOI: 10.1002/adma.200900639

      Thumbnail image of graphical abstract

      Polydiacetylene (PDA) liposome microarrays are developed for selective and sensitive mercury (Hg2+) detection. The PDA mercury sensors are designed to produce red fluorescence emission upon binding with Hg2+, when the ssDNA aptamers on the PDA surface recognize and wrap around mercury ions and the resulting bulky T-Hg-T complexes repulse each other.

    9. Tuning Crystalline Solid-State Order and Charge Transport via Building-Block Modification of Oligothiophenes (pages 3678–3681)

      Colin Reese, Mark E. Roberts, Sean R. Parkin and Zhenan Bao

      Version of Record online: 21 MAY 2009 | DOI: 10.1002/adma.200900836

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      The packing structure of a series of oligothiophenes is tuned via terminal substitution (see figure). The structural changes dramatically alter intermolecular interactions and charge-transport properties, as measured by elastomeric single-crystal field-effect transistors. Electronic structure calculations reveal the sensitivity of the transport efficiency to orbital nodal alignment, as correlated to the observed trend in field-effect mobilities.

    10. White Electroluminescence from a Phosphonate-Functionalized Single-Polymer System with Electron-Trapping Effect (pages 3682–3688)

      Xin Guo, Chuanjiang Qin, Yanxiang Cheng, Zhiyuan Xie, Yanhou Geng, Xiabin Jing, Fosong Wang and Lixiang Wang

      Version of Record online: 18 MAY 2009 | DOI: 10.1002/adma.200803734

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      A novel strategy for obtaining white electroluminescence (EL) is based on the mechanism of electron trapping on host. Phosphonate-functionalized polyfluorene is chosen as host owing to its strong electron affinity. Electrons are confined mostly by host pendants in the EL process, which suppresses charge transfer from host to dopant. White EL with CIE coordinates of (0.34,0.35) is achieved.

    11. Organic Single-Crystal Schottky Gate Transistors (pages 3689–3693)

      Toshihiko Kaji, Taishi Takenobu, Alberto F. Morpurgo and Yoshihiro Iwasa

      Version of Record online: 26 MAY 2009 | DOI: 10.1002/adma.200900276

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      Schottky contacts and Schottky gate transistors on organic single crystals are successfully fabricated, and enable the complete understanding of the operating mechanism as well as a full description of the energy-band diagram. This represents a considerable step forward in the understanding of organic semiconductors, and offers a viable route for organic-device design.

    12. Strong Ultra-Broadband Near-Infrared Photoluminescence from Bismuth-Embedded Zeolites and Their Derivatives (pages 3694–3698)

      Hong-Tao Sun, Akinobu Hosokawa, Yuji Miwa, Fumiaki Shimaoka, Minoru Fujii, Minoru Mizuhata, Shinji Hayashi and Shigehito Deki

      Version of Record online: 26 MAY 2009 | DOI: 10.1002/adma.200900573

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      Zeolites with embedded bismuth compounds display strong, air-stable, long-lived, ultrabroadband, and tunable near-infrared photoluminescence (see picture). Bismuth ions not only act as luminescence-active centers, but also as blocks for selectively closing the “in–out windows” of water molecules. Bismuth active centers can be sealed in a low-vibrational environment by bismuth agglomerates even when the sample still contains a large amount of water.

    13. Low-Driving-Voltage Electroluminescence in Perovskite Films (pages 3699–3702)

      Hiroshi Takashima, Kohei Shimada, Noboru Miura, Tetsuhiro Katsumata, Yoshiyuki Inaguma, Kazushige Ueda and Mitsuru Itoh

      Version of Record online: 26 MAY 2009 | DOI: 10.1002/adma.200900524

      Thumbnail image of graphical abstract

      Perovskite thin-film electroluminescence devices are prepared, opening up a new optical application of perovskite materials. With increasing driving voltage, the intensity of electroluminescence increases dramatically. High-quality red color is produced and the working voltage for whole-surface electroluminescence is as low as 10 V.

    14. Ultrathin Silicon Circuits With Strain-Isolation Layers and Mesh Layouts for High-Performance Electronics on Fabric, Vinyl, Leather, and Paper (pages 3703–3707)

      Dae-Hyeong Kim, Yun-Soung Kim, Jian Wu, Zhuangjian Liu, Jizhou Song, Hoon-Sik Kim, Yonggang Y. Huang, Keh-Chih Hwang and John A. Rogers

      Version of Record online: 6 JUL 2009 | DOI: 10.1002/adma.200900405

      Thumbnail image of graphical abstract

      We present various stretchable high-performance CMOS circuit demonstrations on unconventional substrates, such as fabric, vinyl, leather, and paper. Electronics on such substrates, especially paper, open up new and important application possibilities for electronics. Theoretical analysis reveals the underlying mechanics of these systems; electrical tests under mechanical cycling demonstrate the robustness of the designs.

    15. Stray-Field-Induced Actuation of Free-Standing Magnetic Shape-Memory Films (pages 3708–3711)

      Michael Thomas, Oleg Heczko, Jörg Buschbeck, Yiu Wai Lai, Jeffrey McCord, Stefan Kaufmann, Ludwig Schultz and Sebastian Fähler

      Version of Record online: 2 JUN 2009 | DOI: 10.1002/adma.200900469

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      Free-standing epitaxial NiMnGa films are used to demonstrate a novel thermal actuation mode. To avoid the high magnetostatic stray-field energy, the easy axis of the martensitic variants is aligned preferentially in-plane. This results in a maximum strain of up to 1.1% without the need for training or an external magnetic field.

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