Advanced Materials

Cover image for Vol. 21 Issue 2

January 12, 2009

Volume 21, Issue 2

Pages 127–250

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Frontispiece
    5. Contents
    6. Progress Report
    7. Review Article
    8. Communications
    9. Research News
    10. Index
    1. Plastic Electronics: The Influence of Morphology on High-Performance Polymer Field-Effect Transistors (Adv. Mater. 2/2009)

      Hoi Nok Tsao, Don Cho, Jens Wenzel Andreasen, Ali Rouhanipour, Dag W. Breiby, Wojciech Pisula and Klaus Müllen

      Article first published online: 2 JAN 2009 | DOI: 10.1002/adma.200990000

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      On p. 209, Wojciech Pisula, Klaus Müllen, and co-workers report on directionally oriented, high-performance polymer field-effect transistors for plastic electronics. The cover shows the applied alignment from solution, resulting in pronounced macroscopic ordering of the copolymer chains and finally in excellent transistor behavior, which is promising for applications in, for example, flexible displays.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Frontispiece
    5. Contents
    6. Progress Report
    7. Review Article
    8. Communications
    9. Research News
    10. Index
    1. Biomedical Materials: Nanoporous Biodegradable Elastomers (Adv. Mater. 2/2009)

      Ryan A. Hoshi, Saloni Behl and Guillermo A. Ameer

      Article first published online: 2 JAN 2009 | DOI: 10.1002/adma.200990001

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      The mechanical properties and degradation rate of elastomers can be tailored with nanoporosity. The elastomers described in this study by Guillermo Ameer and co-workers (p. 188) are based on citric acid and are biocompatible. The nanopores also facilitate the entrapment and slow release of macromolecular therapeutics. The inside cover depicts the nano- and microarchitecture of the elastomer prior to pore collapse.

  3. Frontispiece

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Frontispiece
    5. Contents
    6. Progress Report
    7. Review Article
    8. Communications
    9. Research News
    10. Index
    1. Magnetic Materials: X-Ray Magnetic Circular Dichroism Picks out Single-Molecule Magnets Suitable for Nanodevices (Adv. Mater. 2/2009)

      Matteo Mannini, Francesco Pineider, Philippe Sainctavit, Loïc Joly, Arantxa Fraile-Rodríguez, Marie-Anne Cartier dit Arrio, Christophe Moulin, Wolfgang Wernsdorfer, Andrea Cornia, Dante Gatteschi and Roberta Sessoli

      Article first published online: 2 JAN 2009 | DOI: 10.1002/adma.200990002

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      The surface sensitivity of X-ray magnetic circular dichroism in extreme conditions has been exploited to investigate the first layers of bulk single-molecule magnets (SMMs), as reported by Roberta Sessoli and co-workers on p. 167. Striking differences have emerged between two classes of SMM having different structural constraints, thus highlighting the importance of molecular design in the realization of molecular spintronic devices.

  4. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Frontispiece
    5. Contents
    6. Progress Report
    7. Review Article
    8. Communications
    9. Research News
    10. Index
    1. Contents: (Adv. Mater. 2/2009) (pages 127–134)

      Article first published online: 2 JAN 2009 | DOI: 10.1002/adma.200990003

  5. Progress Report

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Frontispiece
    5. Contents
    6. Progress Report
    7. Review Article
    8. Communications
    9. Research News
    10. Index
    1. Advances in Bioapplications of Carbon Nanotubes (pages 139–152)

      Fushen Lu, Lingrong Gu, Mohammed J. Meziani, Xin Wang, Pengju G. Luo, Lucia Monica Veca, Li Cao and Ya-Ping Sun

      Article first published online: 2 DEC 2008 | DOI: 10.1002/adma.200801491

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      Recent advances in bioapplications of carbon nanotubes are reported, including the chemical modification of carbon nanotubes targeting specifically their covalent and noncovalent conjugations with a variety of biological and bioactive species, and the significant recent development and progress in the use of carbon nanotubes for biosensors, drug and other delivery systems, bioimaging, etc. and in the understanding of in vivo biodistribution and toxicity of carbon nanotubes.

  6. Review Article

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Frontispiece
    5. Contents
    6. Progress Report
    7. Review Article
    8. Communications
    9. Research News
    10. Index
    1. Preferential Interface Nucleation: An Expansion of the VLS Growth Mechanism for Nanowires (pages 153–165)

      Brent A. Wacaser, Kimberly A. Dick, Jonas Johansson, Magnus T. Borgström, Knut Deppert and Lars Samuelson

      Article first published online: 25 NOV 2008 | DOI: 10.1002/adma.200800440

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      Reviewing the vapor–liquid–solid (VLS) mechanism suggests that the term preferential interface nucleation replace VLS-like names. There are many processes and details important to nanowire growth, but preferential nucleation at one interface while nucleation on others is suppressed is the general mechanism that describes why nanowires grow faster in one direction than in others. This mechanism also applies to other systems.

  7. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Frontispiece
    5. Contents
    6. Progress Report
    7. Review Article
    8. Communications
    9. Research News
    10. Index
    1. X-Ray Magnetic Circular Dichroism Picks out Single-Molecule Magnets Suitable for Nanodevices (pages 167–171)

      Matteo Mannini, Francesco Pineider, Philippe Sainctavit, Loïc Joly, Arantxa Fraile-Rodríguez, Marie-Anne Arrio, Christophe Cartier dit Moulin, Wolfgang Wernsdorfer, Andrea Cornia, Dante Gatteschi and Roberta Sessoli

      Article first published online: 23 OCT 2008 | DOI: 10.1002/adma.200801883

      Thumbnail image of graphical abstract

      The surface sensitivity of X-ray Magnetic Circular Dichroism in extreme conditions is exploited to investigate the first layers of bulk single-molecule magnets (SMM). Striking differences emerge between two classes of SMM with different structural constraints, thus highlighting the importance of molecular design in the realization of molecular spintronic devices

    2. In vitro Studies of Functionalized Mesoporous Silica Nanoparticles for Photodynamic Therapy (pages 172–177)

      Hsiung-Lin Tu, Yu-Shen Lin, Hsia-Yu Lin, Yann Hung, Leu-Wei Lo, Yang-Fang Chen and Chung-Yuan Mou

      Article first published online: 2 JAN 2009 | DOI: 10.1002/adma.200800548

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      A versatile platform for photodynamic therapy (PDT), mesoporous silica nanoparticles functionalized with protoporphyrin IX (PpIX-MSNs), has been developed. In vitro studies on HeLa cells show high uptake efficiency. Phototoxicity results give both irradiation time- and dosage-dependent cell death events. Because of the ease of incorporating other biomedical functional groups, we believe MSNs would be an ideal platform for biomedical applications.

    3. Tunable Memory Characteristics of Nanostructured, Nonvolatile Charge Trap Memory Devices Based on a Binary Mixture of Metal Nanoparticles as a Charge Trapping Layer (pages 178–183)

      Jang-Sik Lee, Yong-Mu Kim, Jeong-Hwa Kwon, Hyunjung Shin, Byeong-Hyeok Sohn and Jaegab Lee

      Article first published online: 30 OCT 2008 | DOI: 10.1002/adma.200800340

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      Tunable memory characteristics are investigated according to the metal-nanoparticle species being used in memory devices. The memory devices are fabricated using diblock copolymer micelles as templates to synthesize nanoparticles of cobalt, gold, and a binary mixture thereof. Programmable memory characteristics show different charging/discharging behaviors according to the storage element configurations as confirmed by nanoscale device characterization.

    4. Magnetic Janus Particles Prepared by a Flame Synthetic Approach: Synthesis, Characterizations and Properties (pages 184–187)

      Nan Zhao and Mingyuan Gao

      Article first published online: 2 JAN 2009 | DOI: 10.1002/adma.200800570

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      Spherical Janus particles consisting of γ-Fe2O3 and SiO2 bicompartments are effectively prepared through a flame synthetic route. The excellent colloidal stability of these particles offers versatile choices for further manipulating them to form different types of assembled structures. As an example, the synthesis of hollow capsules with a magnetic core and a soft Au/PVP-film shell is demosntrated.

    5. Nanoporous Biodegradable Elastomers (pages 188–192)

      Ryan A. Hoshi, Saloni Behl and Guillermo A. Ameer

      Article first published online: 4 NOV 2008 | DOI: 10.1002/adma.200801132

      Thumbnail image of graphical abstract

      A nanoporous biodegradable elastomer based on citric acid is described. Nanopores are used to control the mechanical and degradation properties of the elastomer. Furthermore, macromolecular drugs can be entrapped under mild conditions via pore collapse, which also delays the release of the drug. The nanoporous elastomer is biocompatible and a promising platform technology for engineering soft tissues.

    6. A Chemical Solution Approach to Epitaxial Metal Nitride Thin Films (pages 193–197)

      Hongmei Luo, Yuan Lin, Haiyan Wang, Joon Hwan Lee, Natalya A. Suvorova, Alexander H. Mueller, Anthony K. Burrell, T. Mark McCleskey, Eve Bauer, Igor O. Usov, Marilyn E. Hawley, Terry G. Holesinger and Quanxi Jia

      Article first published online: 30 OCT 2008 | DOI: 10.1002/adma.200801959

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      Epitaxial metal nitride films are prepared using a general chemical solution approach. A polymer-assisted deposition to prepare epitaxial cubic TiN, metastable AlN, and ternary nitride Ti1−xAlxN films is demonstrated. The structural, optical and electrical properties of the films are investigated, and may be of interest for many technological applications.

    7. Exploring Optical Properties of Liquid Crystals for Developing Label-Free and High-Throughput Microfluidic Immunoassays (pages 198–202)

      Chang-Ying Xue, Saif A. Khan and Kun-Lin Yang

      Article first published online: 4 NOV 2008 | DOI: 10.1002/adma.200801803

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      The orientational transition of liquid crystals (LCs) is used as a label-free detection mechanism for immunoassays developed in microfluidic systems. LCs only show bright optical textures (visible to the naked eye) in the line-line intersections in which label-free antibodies bind to their surface-immobilized antigens, suggesting the feasibility of using LCs to detect specific antigen-antibody binding events in a high-throughput and multiplexed manner.

    8. Control of Domain Orientation in Block Copolymer Electrolyte Membranes at the Interface with Humid Air (pages 203–208)

      Moon Jeong Park, Suhan Kim, Andrew M. Minor, Alexander Hexemer and Nitash P. Balsara

      Article first published online: 2 JAN 2009 | DOI: 10.1002/adma.200801613

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      Domain orientation in polymer electrolyte membranes is tuned by controlling its sulfonation level and the moisture content of the air. At low sulfonation levels, highly ordered hydrophobic cylinders oriented perpendicular to the film surface are obtained, when the film is in humid air. Increasing the sulfonation level results in a transition from perpendicular to parallel orientation.

    9. The Influence of Morphology on High-Performance Polymer Field-Effect Transistors (pages 209–212)

      Hoi Nok Tsao, Don Cho, Jens Wenzel Andreasen, Ali Rouhanipour, Dag W. Breiby, Wojciech Pisula and Klaus Müllen

      Article first published online: 2 DEC 2008 | DOI: 10.1002/adma.200802032

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      The influence of molecular packing on the performance of polymer organic field-effect transistors is illustrated in this work. Both close π-stacking distance and long-range order are important for achieving high mobilities. By aligning the polymers from solution, long-range order is induced, yielding hole mobilities of up to µsat = 1.4 cm2 V−1 s−1 and current on/off ratios Ion/Ioff of 105.

    10. Dithieno[2,3-d;2′,3′-d′]benzo[1,2-b;4,5-b′]dithiophene (DTBDT) as Semiconductor for High-Performance, Solution-Processed Organic Field-Effect Transistors (pages 213–216)

      Peng Gao, Dirk Beckmann, Hoi Nok Tsao, Xinliang Feng, Volker Enkelmann, Martin Baumgarten, Wojciech Pisula and Klaus Müllen

      Article first published online: 12 NOV 2008 | DOI: 10.1002/adma.200802031

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      The facile synthesis of a new five-ring-fused pentacene analog with four symmetrically fused thiophene ring units (Dithieno[2,3-d;2′,3′-d′]benzo[1,2-b;4,5-b′]dithiophene, Cn-DTBDT) is presented. After aligning this material from solution, thin films for organic field-effect transistors were obtained, resulting in excellent hole mobilities of up to 1.7 cm2V−1s−1, and on/off ratio of 107.

    11. Nanocomposites of Ferroelectric Polymers with TiO2 Nanoparticles Exhibiting Significantly Enhanced Electrical Energy Density (pages 217–221)

      Junjun Li, Sang Il Seok, Baojin Chu, Fatih Dogan, Qiming Zhang and Qing Wang

      Article first published online: 30 OCT 2008 | DOI: 10.1002/adma.200801106

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      Novel dielectric nanocomposites composed of ferroelectric polymers and surface-functionalized TiO2 nanoparticles with comparable dielectric permittivities and homogeneous nanoparticle dispersions are prepared and characterized. Enhancements in electric displacement and energy density at high electric fields are demonstrated.

    12. Shape-Controlled Nanoarchitectures Using Nanowalls (pages 222–226)

      Young Joon Hong, Hye Seong Jung, Jinkyoung Yoo, Yong-Jin Kim, Chul-Ho Lee, Miyoung Kim and Gyu-Chul Yi

      Article first published online: 10 NOV 2008 | DOI: 10.1002/adma.200703168

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      A novel method for shaping and positioning ZnO nanoarchitectures using conventional lithography and catalyst-free metal organic vapor-phase epitaxy is demonstrated. Nanowalls and nanotubes of desired shapes and arrangements can be grown heteroepitaxially on Si substrates, and their electron-emission characteristics were optimized by changing their diameter and spacing. This method can be readily expanded to create many artificial 1D and 2D structures, as required for various device applications.

    13. GaN Nanofibers based on Electrospinning: Facile Synthesis, Controlled Assembly, Precise Doping, and Application as High Performance UV Photodetector (pages 227–231)

      Hui Wu, Yao Sun, Dandan Lin, Rui Zhang, Chen Zhang and Wei Pan

      Article first published online: 30 OCT 2008 | DOI: 10.1002/adma.200800529

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      Nitride nanofibers have been synthesized based on a simple electrospinning technique for the first time. No catalysts or templates are needed in this new synthetic method. Highly oriented GaN nanofiber arrays, as well as a high-performance UV photodetector based on single GaN nanofiber assembled FET devices, can be facilely fabricated using this technique. Precise doping of other elements into the GaN nanofibers is easy by this solution-based synthetic method.

    14. Atomic Layer Deposition of ZnO in Quantum Dot Thin Films (pages 232–235)

      Alexandre Pourret, Philippe Guyot-Sionnest and Jeffrey W. Elam

      Article first published online: 30 OCT 2008 | DOI: 10.1002/adma.200801313

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      CdSeS/CdS/ZnS quantum dot thin films subjected to ZnO atomic layer deposition at 100°C shows photoluminescence (PL) modulation. The PL is quenched during each exposure to diethyl zinc. However, the PL is restored upon subsequent exposure to water.

    15. Very High Critical Field and Superior Jc-Field Performance in NdFeAsO0.82F0.18 with Tc of 51 K (pages 236–239)

      Xiaolin Wang, Shaban Reza Ghorbani, Germanas Peleckis and Shixue Dou

      Article first published online: 30 OCT 2008 | DOI: 10.1002/adma.200801527

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      A new family of oxypnictide superconductors, LaFeAsO0.89F0.11, brings new impetus to the field of high-temperature superconductivity. In this work, we show that the upper critical field values Hc2 (48 K) = 13 T and Hc2(0) can exceed 80–230 T in a high-pressure-fabricated NdO0.82F0.18FeAs bulk sample with Tc of 51 K. We also demonstrate the superior performance of supercurrent density in fields for this new superconductor.

  8. Research News

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Frontispiece
    5. Contents
    6. Progress Report
    7. Review Article
    8. Communications
    9. Research News
    10. Index
    1. Multiresponsive, Hierarchically Structured Membranes: New, Challenging, Biomimetic Materials for Biosensors, Controlled Release, Biochemical Gates, and Nanoreactors (pages 241–247)

      Ihor Tokarev and Sergiy Minko

      Article first published online: 4 DEC 2008 | DOI: 10.1002/adma.200801408

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      Multifunctional responsive gel membranes present a new and promising platform for the development of “smart” devices for bioseparation, biosensors, and “smart” drug release. These membranes combine the functions of stimuli-responsive control and regulation of the mass transport with a range of properties, such as storage, catalysis of chemical reactions, antimicrobial activity, and optical signal transduction.

  9. Index

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

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