Advanced Materials

Cover image for Vol. 21 Issue 12

March 26, 2009

Volume 21, Issue 12

Pages 1207–1298

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review Article
    6. Communications
    7. Research News
    8. Index
    1. “Dry” Patterning: Direct Patterning of Organic-Thin-Film-Transistor Arrays via a “Dry-Taping” Approach (Adv. Mater. 12/2009)

      Shuhong Liu, Héctor A. Becerril, Melburne C. LeMieux, Wechung Maria Wang, Joon Hak Oh and Zhenan Bao

      Article first published online: 24 MAR 2009 | DOI: 10.1002/adma.200990038

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      The cover shows the patterning of several solution- and vapor-deposited small molecule organic semiconductors using a dry taping approach. Zhenan Bao and co-workers demonstrate on page 1266 that this technique allows direct fabrication of large area arrays of bottom-contact high-performance organic thin-film field-effect transistors with self-aligned electrodes. Patterned devices exhibit significantly higher On/Off ratios and lower parasitic leakage than unpatterned ones.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review Article
    6. Communications
    7. Research News
    8. Index
    1. Thin Films: One Nanometer Thin Carbon Nanosheets with Tunable Conductivity and Stiffness (Adv. Mater. 12/2009)

      Andrey Turchanin, André Beyer, Christoph T. Nottbohm, Xianghui Zhang, Rainer Stosch, Alla Sologubenko, Joachim Mayer, Peter Hinze, Thomas Weimann and Armin Gölzhäuser

      Article first published online: 24 MAR 2009 | DOI: 10.1002/adma.200990039

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      Andrey Turchanin and co-workers report on page 1233 on the fabrication and characterization of atomically thin (∼1 nm) carbon films and membranes with tunable conductivity and stiffness, arbitrary size and shape. These carbon nanosheets are produced using self-assembled monolayers of aromatic molecules, which are cross-linked by electrons, detached from the surfaces, and subsequently pyrolized. The technical applicability of these novel materials is demonstrated by incorporating them into a microscopic pressure sensor. The optical microscopy image shows a folded nanosheet transferred onto an oxidized silicon wafer.

  3. Contents

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

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review Article
    6. Communications
    7. Research News
    8. Index
    1. Controlled Deposition of Crystalline Organic Semiconductors for Field-Effect-Transistor Applications (pages 1217–1232)

      Shuhong Liu, Wechung Maria Wang, Alejandro L. Briseno, Stefan C. B. Mannsfeld and Zhenan Bao

      Article first published online: 13 FEB 2009 | DOI: 10.1002/adma.200802202

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      Deposition techniques that offer control over the location or in-plane orientation of organic semiconductors are highlighted in this review, with special focus on various vapor- and solution-processing techniques for patterning organic single crystals. Furthermore, the alignment of organic semiconductors via different methods relying on mechanical forces, alignment layers, epitaxial growth and external fields are surveyed.

  5. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review Article
    6. Communications
    7. Research News
    8. Index
    1. One Nanometer Thin Carbon Nanosheets with Tunable Conductivity and Stiffness (pages 1233–1237)

      Andrey Turchanin, André Beyer, Christoph T. Nottbohm, Xianghui Zhang, Rainer Stosch, Alla Sologubenko, Joachim Mayer, Peter Hinze, Thomas Weimann and Armin Gölzhäuser

      Article first published online: 2 MAR 2009 | DOI: 10.1002/adma.200803078

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      Atomically thin (∼1 nm) carbon films and membranes whose electrical behavior can be tuned from insulating to conducting are fabricated by a novel route. These films present arbitrary size and shape based on molecular self-assembly, electron irradiation, and pyrolysis, and their technical applicability is demonstrated by their incorporation into a microscopic pressure sensor.

    2. A “Nanoprism” Probe for Nano-optical Applications (pages 1238–1242)

      Taekyeong Kim, Deok-Soo Kim, Byung Yang Lee, Zee Hwan Kim and Seunghun Hong

      Article first published online: 14 JAN 2009 | DOI: 10.1002/adma.200801528

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      “Nanoprism” probes are fabricated for nano-optical applications. The fabrication process is scalable for mass-production, and can be used to prepare nanoprobes terminated with virtually any nanostructure, such as nanoprisms, ZnO nanorods, and nanoparticles. ANSOM imaging was performed on a nanoparticle using Au-nanoprism probes, revealing field localization at the vertices of the nanoprism.

    3. Toward Site-Specific Stamping of Graphene (pages 1243–1246)

      Dongsheng Li, Wolfgang Windl and Nitin P. Padture

      Article first published online: 30 DEC 2008 | DOI: 10.1002/adma.200802417

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      A physical hypothesis based on theory and ab initio modeling for the stamping of graphene and few-layers graphene (FLG) on silica is presented, and the feasibility of site-specific stamping of FLG patterns is demonstrated experimentally (figure shows ten-layer FLG pattern stamped on silica). The site-specific nature of the patterned stamps could enable high-throughput fabrication of future graphene-based integrated devices.

    4. Template-Guided Self-Assembly of Colloidal Quantum Dots Using Plasma Lithography (pages 1247–1251)

      Michael Junkin, Jennifer Watson, Jonathan P. Vande Geest and Pak Kin Wong

      Article first published online: 6 FEB 2009 | DOI: 10.1002/adma.200802122

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      A plasma lithography technique is developed to guide the self-assembly of colloidal quantum dots and other nanoscale building blocks, including fluorescent nanoparticles, gold nanoparticles, salts, and proteins. Plasma lithography enables the self-assembly of nanoscale materials onto soft and polymeric substrates with feature sizes as small as 100 nm.

    5. Highly Reactive Multilayer-Assembled TiO2 Coating on Electrospun Polymer Nanofibers (pages 1252–1256)

      Jung Ah Lee, Kevin C. Krogman, Minglin Ma, Randal M. Hill, Paula T. Hammond and Gregory C. Rutledge

      Article first published online: 24 NOV 2008 | DOI: 10.1002/adma.200802458

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      Highly efficient photocatalytically active TiO2-coated polymer fibers are prepared using a facile and universal method involving layer-by-layer assembly of TiO2 nanoparticles and POSS molecules on various electrospun fibers. The TiO2-coated fibers display excellent photocatalytic properties in degradation of allyl alcohol under UV illumination, without degradation of substrates.

    6. A New Method of Carbon-Nanotube Patterning Using Reduction Potentials (pages 1257–1260)

      Jong Hak Lee, Jun Ho Shin, Yu Hee Kim, Sung Min Park, P. S. Alegaonkar and Ji-Beom Yoo

      Article first published online: 14 JAN 2009 | DOI: 10.1002/adma.200802507

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      Noble metals promote the oxidation of carbon nanotubes (CNTs) at the relatively low temperature of 350 °C. The reduction potential of multiwalled CNTs is located between those of W and Ni, while that of single-walled CNTs is between those of Ni and In. Nanometer-sized patterns on CNT films were successfully fabricated using differences in reduction potential between the CNTs and noble metals.

    7. Tunable Organophosphorus Dopants for Bright White Organic Light-Emitting Diodes with Simple Structures (pages 1261–1265)

      Omrane Fadhel, Michael Gras, Noella Lemaitre, Valérie Deborde, Muriel Hissler, Bernard Geffroy and Régis Réau

      Article first published online: 18 DEC 2008 | DOI: 10.1002/adma.200801913

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      Efficient white-light-emitting LEDs have been constructed by varying the substitution pattern of phosphole derivatives and chemical modification of their P atoms, producing thermally stable derivatives that are used as suitable dopants in a blue-light-emitting host. The devices exhibit high brightness and, due to their simple structures, current-independent CIE coordinates.

    8. Direct Patterning of Organic-Thin-Film-Transistor Arrays via a “Dry-Taping” Approach (pages 1266–1270)

      Shuhong Liu, Héctor A. Becerril, Melburne C. LeMieux, Wechung Maria Wang, Joon Hak Oh and Zhenan Bao

      Article first published online: 19 FEB 2009 | DOI: 10.1002/adma.200802201

      Thumbnail image of graphical abstract

      Dry patterning of a variety of solution- and vapor-deposited small-molecule organic semiconductors using adhesive tape is demonstrated. This technique allows direct fabrication of large-area arrays of bottom-contact high-performance organic- thin-film field-effect transistors with self-aligned electrodes. These patterned devices exhibit significantly higher on/off ratios and lower parasitic leakage currents than control unpatterned devices of the same materials.

    9. Nearly 100% Internal Quantum Efficiency in an Organic Blue-Light Electrophosphorescent Device Using a Weak Electron Transporting Material with a Wide Energy Gap (pages 1271–1274)

      Lixin Xiao, Shi-Jian Su, Yuya Agata, Hsinglin Lan and Junji Kido

      Article first published online: 14 JAN 2009 | DOI: 10.1002/adma.200802034

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      A blue-light electrophosphorescence with an internal quantum efficiency of nearly 100%, much higher than that of a stronger electron transporting (ET) material, was achieved with a weak ET silane. This result contradicts the conventional notion that weak ET materials result in low efficiency.

    10. A Graphene Hybrid Material Covalently Functionalized with Porphyrin: Synthesis and Optical Limiting Property (pages 1275–1279)

      Yanfei Xu, Zhibo Liu, Xiaoliang Zhang, Yan Wang, Jianguo Tian, Yi Huang, Yanfeng Ma, Xiaoyan Zhang and Yongsheng Chen

      Article first published online: 13 FEB 2009 | DOI: 10.1002/adma.200801617

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      An organic solution-processable functionalized graphene (SPFGraphene) hybrid material with porphyrins is reported for the first time. FTIR, UV-vis absorption, and TEM studies confirm the covalent functionalization of the graphene. A superior optical limiting effect, better than the benchmark optical limiting material C60 and the control sample, is observed.

    11. Favorable Modulation of Pre-Osteoblast Response to Nanograined/Ultrafine-grained Structures in Austenitic Stainless Steel (pages 1280–1285)

      R.D.K. Misra, W-W. Thein-Han, T.C. Pesacreta, K.H. Hasenstein, M.C. Somani and L.P. Karjalainen

      Article first published online: 2 JAN 2009 | DOI: 10.1002/adma.200802478

      Thumbnail image of graphical abstract

      Nanograined (NG)/ultrafine-grained (UFG)structures show enhanced cellular response of pre-osteoblasts. Cell proliferation, viability, and morphology on phase-reversion annealed NG/UFG austenitic stainless steel were observed to be favorably modulated in comparison to conventional coarse-grained austenitic stainless steel. The improvement in cellular response is ascribed to NG/UFG structure and hydrophilicity of the cell substrate.

    12. Synthesis of Porous Bi2WO6 Thin Films as Efficient Visible-Light-Active Photocatalysts (pages 1286–1290)

      Li-Wu Zhang, Ya-Jun Wang, Han-Yun Cheng, Wen-Qing Yao and Yong-Fa Zhu

      Article first published online: 16 DEC 2008 | DOI: 10.1002/adma.200801354

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      Bi2WO6 ordered porous film with open pores, an example of a photocatalytically active ternary metal oxide under visible-light irradiation, is prepared using a simple and reproducible route. The ordered porous Bi2WO6 films exhibited much higher photocatalytic activity and photocurrent coversion efficiency than nonporous Bi2WO6 films under visible-light irradiation (λ > 420 nm).

  6. Research News

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review Article
    6. Communications
    7. Research News
    8. Index
    1. Conjugated Microporous Polymers (pages 1291–1295)

      Andrew I. Cooper

      Article first published online: 14 JAN 2009 | DOI: 10.1002/adma.200801971

      Thumbnail image of graphical abstract

      Conjugated microporous polymers combine extended conjugation with small pore sizes (d < 2 nm) and surface areas in excess of 1000 m2 g−1 in some cases. This new class of materials is discussed with particular emphasis on potential future applications which might exploit these large interfacial areas.

  7. Index

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

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