Advanced Functional Materials

Cover image for Vol. 21 Issue 18

September 23, 2011

Volume 21, Issue 18

Pages 3397–3594

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Contents
    6. Corrections
    7. Frontispiece
    8. Feature Article
    9. Full Papers
    1. Drug Delivery: Iron Oxide Nanotubes for Magnetically Guided Delivery and pH-Activated Release of Insoluble Anticancer Drugs (Adv. Funct. Mater. 18/2011) (page 3397)

      Zhan-Guo Yue, Wei Wei, Zuo-Xiang You, Qin-Zheng Yang, Hua Yue, Zhi-Guo Su and Guang-Hui Ma

      Article first published online: 20 SEP 2011 | DOI: 10.1002/adfm.201190073

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      Low solubility in water is an intrinsic property of many drugs, which hinders their clinical use. On page 3446, Guang-Hui Ma and co-workers present PEGylated iron oxide nanotubes. The rod-like shape facilitates cellular uptake, and the tube structure possesses a high drug-loading capacity. These nanotubes also exhibit a stealth effect to macrophages, great magnetic response, and low pH-activated release profiles, exhibiting promising potential for delivering insoluble anticancer drugs in clinical applications.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Contents
    6. Corrections
    7. Frontispiece
    8. Feature Article
    9. Full Papers
    1. Lithium-Ion Batteries: Hierarchical Self-assembly of Microscale Cog-like Superstructures for Enhanced Performance in Lithium-Ion Batteries (Adv. Funct. Mater. 18/2011) (page 3398)

      Weixin Zhang, Mei Li, Qiang Wang, Gongde Chen, Mei Kong, Zeheng Yang and Stephen Mann

      Article first published online: 20 SEP 2011 | DOI: 10.1002/adfm.201190074

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      CuO/Cu electrodes comprising a surface layer of a densely packed array of unusual cog-shaped CuO microparticles with hierarchical nanofilament-based superstructures are presented by Stephen Mann and co-workers on page 3516. The electrodes demonstrate an improvement in coulombic efficiency, specific capacity, and cycling performance as anodes in lithium-ion batteries. The initial discharge capacity and reversible capacity are higher than for most copper oxide materials used.

  3. Back Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Contents
    6. Corrections
    7. Frontispiece
    8. Feature Article
    9. Full Papers
    1. Optical Sensors: One-Step Fabrication of Multifunctional Core-Shell Fibres by Co-Electrospinning (Adv. Funct. Mater. 18/2011) (page 3595)

      Antonio L. Medina-Castillo, Jorge F. Fernández-Sánchez and Alberto Fernández-Gutiérrez

      Article first published online: 20 SEP 2011 | DOI: 10.1002/adfm.201190077

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      Core–shell fibers, fabricated by co-electrospinning, are presented by Antonio L. Medina-Castillo, Jorge F. Fernández-Sánchez, and co-worker on page 3488. The fiber shell is formed by a fluorescent pH-sensitive co-polymer while the core is formed by magnetic nanoparticles and an oxygen indicator dispersed in poly(methyl methacrylate). The core-shell fibers are magnetic, change their optical properties with the pH of the media, and they are sensitive to O2 – characteristics promising towards application in optical sensors.

  4. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Contents
    6. Corrections
    7. Frontispiece
    8. Feature Article
    9. Full Papers
    1. Contents: (Adv. Funct. Mater. 18/2011) (pages 3399–3406)

      Article first published online: 20 SEP 2011 | DOI: 10.1002/adfm.201190075

  5. Corrections

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Contents
    6. Corrections
    7. Frontispiece
    8. Feature Article
    9. Full Papers
    1. You have free access to this content
      Correction: The Dielectric Constant of Self-Assembled Monolayers (page 3406)

      Lorenz Romaner, Georg Heimel, Claudia Ambrosch-Draxl and Egbert Zojer

      Article first published online: 20 SEP 2011 | DOI: 10.1002/adfm.201190078

      This article corrects:

      The Dielectric Constant of Self-Assembled Monolayers1

      Vol. 18, Issue 24, 3999–4006, Article first published online: 18 NOV 2008

    2. You have free access to this content
      Correction: Organic Resistive Memory Devices: Performance Enhancement, Integration, and Advanced Architectures (page 3406)

      Byungjin Cho, Sunghun Song, Yongsung Ji, Tae-Wook Kim and Takhee Lee

      Article first published online: 20 SEP 2011 | DOI: 10.1002/adfm.201190079

      This article corrects:

      Organic Resistive Memory Devices: Performance Enhancement, Integration, and Advanced Architectures

      Vol. 21, Issue 15, 2806–2829, Article first published online: 8 JUL 2011

  6. Frontispiece

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Contents
    6. Corrections
    7. Frontispiece
    8. Feature Article
    9. Full Papers
    1. Bioimaging: Fluorescent Conjugated Polyelectrolytes for Bioimaging (Adv. Funct. Mater. 18/2011) (page 3407)

      Kan-Yi Pu and Bin Liu

      Article first published online: 20 SEP 2011 | DOI: 10.1002/adfm.201190076

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      In their Feature Article, on page 3408, Kan-Yi Pu and Bin Liu highlight the recent advance of conjugated polyelectrolytes (CPEs) in bioimaging applications. The specially designed CPEs with three-dimensional size-tunable nanoarchitectures can serve as bright, biocompatible, and photostable fluorescent imaging nanomaterials, allowing for in vitro intracellular protein sensing, cell detection, and in vivo cell imaging and drug tracking.

  7. Feature Article

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Contents
    6. Corrections
    7. Frontispiece
    8. Feature Article
    9. Full Papers
    1. Fluorescent Conjugated Polyelectrolytes for Bioimaging (pages 3408–3423)

      Kan-Yi Pu and Bin Liu

      Article first published online: 15 AUG 2011 | DOI: 10.1002/adfm.201101153

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      Conjugated polyelectrolytes with three-dimensional size-tunable nano-architectures, including grafted, hyperbranched, and polyhedral oligomeric silsesquioxanes (POSS) based derivatives, can serve as bright, biocompatible and photostable fluorescent imaging materials, allowing for in vitro intracellular protein sensing, cell detection as well as in vivo cell imaging and drug tracking.

  8. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Contents
    6. Corrections
    7. Frontispiece
    8. Feature Article
    9. Full Papers
    1. Self-Assembled SERS Substrates with Tunable Surface Plasmon Resonances (pages 3424–3429)

      Wonjoo Lee, Seung Yong Lee, Robert M. Briber and Oded Rabin

      Article first published online: 8 JUL 2011 | DOI: 10.1002/adfm.201101218

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      Self-assembly of gold nanoparticles on block copolymers is demonstrated to produce SERS substrates with tunable surface plasmon resonances. As the gap between nanoparticles is modified by electroless deposition, the plasmon resonances shift in frequency and are chosen to best match the laser frequency of Raman spectrometers. Substrates with optimized SERS enhancement factors are thus obtained.

    2. Analysis of Cavity-Mode Lasing Characteristics from a Resonator with Broadband Cholesteric Liquid-Crystal Bragg Reflectors (pages 3430–3438)

      Hyunhee Choi, Suzushi Nishimura, Takehiro Toyooka, Ken Ishikawa and Hideo Takezoe

      Article first published online: 18 JUL 2011 | DOI: 10.1002/adfm.201100276

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      Broadband resonators are fabricated from multiple polymer cholesteric liquid crystal (PCLC) layers with various pitches. Dye-doped anisotropic nematic liquid crystal (NLC) and isotropic toluene are introduced as host-gain media into the these broadband resonators. Detailed lasing characteristics are presented based on simulations with specified eigen modes. The figure shows the broadband PCLC resonator of dye-doped NLC gain medium and the red–green–blue lasing emission together with the transmission spectrum and fluorescence of dye-doped NLC.

    3. Enhanced Transport of Nanoparticles Across a Porous Nanotube Sponge (pages 3439–3445)

      Hongbian Li, Xuchun Gui, Luhui Zhang, Chunyan Ji, Yichi Zhang, Pengzhan Sun, Jinquan Wei, Kunlin Wang, Hongwei Zhu, Dehai Wu and Anyuan Cao

      Article first published online: 18 JUL 2011 | DOI: 10.1002/adfm.201100823

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      Enhanced transport of large nanoparticles through porous carbon nanotube sponges is achieved by mixing the large nanoparticles with small ones. These small particles with reactive surface groups prevent the large particles from aggregating. This results in increased interparticle distances, and facilitates the smooth movement of large particles across a thick nanotube network.

      Corrected by:

      Correction: Enhanced Transport of Nanoparticles Across a Porous Nanotube Sponge

      Vol. 24, Issue 16, 2265, Article first published online: 16 APR 2014

    4. Iron Oxide Nanotubes for Magnetically Guided Delivery and pH-Activated Release of Insoluble Anticancer Drugs (pages 3446–3453)

      Zhan-Guo Yue, Wei Wei, Zuo-Xiang You, Qin-Zheng Yang, Hua Yue, Zhi-Guo Su and Guang-Hui Ma

      Article first published online: 24 JUN 2011 | DOI: 10.1002/adfm.201100510

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      PEGylated iron oxide nanotubes are developed for magnetically guided delivery of insoluble anticancer drugs. The rod-like shape facilitates cellular uptake, and the tube structure possesses a high drug-loading capacity. They also exhibit the advantages of a stealth effect to macrophages, great magnetic response, and low pH-activated release profiles. Consequently, this novel drug carrier clearly exhibits promising potential for efficiently delivering insoluble anticancer drugs in clinical applications.

    5. Mechanical Characterization of Amyloid Fibrils Using Coarse-Grained Normal Mode Analysis (pages 3454–3463)

      Gwonchan Yoon, Jinhak Kwak, Jae In Kim, Sungsoo Na and Kilho Eom

      Article first published online: 28 JUL 2011 | DOI: 10.1002/adfm.201002493

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      The mechanical properties of amyloid fibrils playing a role in disease expression are studied with respect to their molecular structural hierarchy using coarse-grained normal mode analysis. It is found that the aggregation of β peptides in a specific pattern leads to enhancement of the mechanical stability of amyloids, and that the length-dependent mechanical stabilities of amyloids are well elucidated from Timoshenko beam model, shedding an insight into the shear effects on the mechanical stability of amyloids.

    6. Sustained Lithium-Storage Performance of Hierarchical, Nanoporous Anatase TiO2 at High Rates: Emphasis on Interfacial Storage Phenomena (pages 3464–3472)

      Ji-Yong Shin, Dominik Samuelis and Joachim Maier

      Article first published online: 3 AUG 2011 | DOI: 10.1002/adfm.201002527

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      A hierarchical, nanoporous TiO2 (anatase) with substantially high surface area achieves fully reversible discharge capacities as high as 302 mA h g−1 and 200 mA h g−1 at charge/discharge rates of 1 C and 5 C, respectively. The remarkably improved electrode performance is explained in conjunction with the importance of the interfacial (surface) storage mechanism.

    7. Calcite Reinforced Silica–Silica Joints in the Biocomposite Skeleton of Deep-Sea Glass Sponges (pages 3473–3481)

      Hermann Ehrlich, Eike Brunner, Paul Simon, Vasily V. Bazhenov, Joseph P. Botting, Kontantin R. Tabachnick, Armin Springer, Kurt Kummer, Denis V. Vyalikh, Serguei L. Molodtsov, Denis Kurek, Martin Kammer, René Born, Alexander Kovalev, Stanislav N. Gorb, Petros G. Koutsoukos and Adam Summers

      Article first published online: 29 JUL 2011 | DOI: 10.1002/adfm.201100749

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      In the stalk and body skeleton of deep-sea glass spongeCaulophacusspecies siliceous spicules are modified by the addition of conical calcite seeds, which form the basis for further silica secretion to form a spinose region. The hierarchically structured glass sponge uses a silica and calcite biocomposite to join the spicules of its skeleton together, and the hexactinellid sponges are capable of synthesizing calcite, the ancestral skeletal material. Computer reconstruction is based on scanning electron microscopy images and represents the view on mechanical coupling between unique spinose surfaces of two thin spicules within one large spicule.

    8. Controlled Polarizability of One-Nanometer-Thick Oxide Nanosheets for Tailored, High-κ Nanodielectrics (pages 3482–3487)

      Minoru Osada, Genki Takanashi, Bao-Wen Li, Kosho Akatsuka, Yasuo Ebina, Kanta Ono, Hiroshi Funakubo, Kazunori Takada and Takayoshi Sasaki

      Article first published online: 26 JUL 2011 | DOI: 10.1002/adfm.201100580

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      Controlled polarizability via doping, a well-known technique in bulk materials, is now useful for designing high-κ properties of individual nanocrystals. In oxide nanosheets (TiNbO5, Ti2NbO7, Ti5NbO14), the distortion induced by NbO6 modification results in a large permittivity (160–320) and simultaneously stabilizes the dielectric response in the ultrathin form (<10 nm), contrasting to current high-κ films.

    9. One-Step Fabrication of Multifunctional Core-Shell Fibres by Co-Electrospinning (pages 3488–3495)

      Antonio L. Medina-Castillo, Jorge F. Fernández-Sánchez and Alberto Fernández-Gutiérrez

      Article first published online: 25 JUL 2011 | DOI: 10.1002/adfm.201100707

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      A new, advanced multifunctional material consisting of well-organized and three-functional core-shell fibres is obtained via an easy one-step method using electrified coaxial jets. The luminescent properties of the core-shell fibre mats were successfully used simultaneously for pH and O2, and showed complete reversibility, high sensitivity, high magnetic susceptibility, and short response times.

    10. Facile Physical Route to Highly Crystalline Graphene (pages 3496–3501)

      Meihua Jin, Tae Hyung Kim, Seong Chu Lim, Dinh Loc Duong, Hyeon Jin Shin, Young Woo Jo, Hae Kyung Jeong, Jian Chang, Sishen Xie and Young Hee Lee

      Article first published online: 25 JUL 2011 | DOI: 10.1002/adfm.201101037

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      A physical route is proposed to obtain highly crystalline graphene sheets with a minimal oxygen content similar to the precursor graphite. For graphene sheets, the D band intensity is reduced significantly and furthermore, the G band intensity is recovered, similar to the precursor graphite. As a consequence, excellent electrical conductivity and the related sheet resistance of the graphene film are obtained.

    11. Novel Method of Preparation of Gold-Nanoparticle-Doped TiO2 and SiO2 Plasmonic Thin Films: Optical Characterization and Comparison with Maxwell–Garnett Modeling (pages 3502–3507)

      Esteban Pedrueza, José L. Valdés, Vladimir Chirvony, Rafael Abargues, Jesús Hernández-Saz, Miriam Herrera, Sergio I. Molina and Juan P. Martínez-Pastor

      Article first published online: 29 JUL 2011 | DOI: 10.1002/adfm.201101020

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      TiO2 and SiO2 thin films doped with Au nanoparticles in a dielectric layer are produced by a novel method of fabrication. A posterior HF etching step leaves a significant proportion of the Au nanoparticles uncovered and lying on the film surface to give a strongly enhanced antireflective effect. Additional light trapping in the Si substrate is expected due to preferential light scattering into Si as a material with higher permittivity.

    12. ph-Dependent Synthesis of Pepsin-Mediated Gold Nanoclusters with Blue Green and Red Fluorescent Emission (pages 3508–3515)

      Hideya Kawasaki, Kenji Hamaguchi, Issey Osaka and Ryuichi Arakawa

      Article first published online: 15 AUG 2011 | DOI: 10.1002/adfm.201100886

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      Fluorescent gold nanoclusters (AuNCs) are prepared by a pH-dependent synthesis using pepsin. The as-prepared AuNCs show blue, green, and red fluorescent emission from Au5 (Au8), Au13, and Au25, which open up new opportunities for preparing AuNCs based on protein function and the structures.

    13. Hierarchical Self-assembly of Microscale Cog-like Superstructures for Enhanced Performance in Lithium-Ion Batteries (pages 3516–3523)

      Weixin Zhang, Mei Li, Qiang Wang, Gongde Chen, Mei Kong, Zeheng Yang and Stephen Mann

      Article first published online: 25 JUL 2011 | DOI: 10.1002/adfm.201101088

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      CuO/Cu electrodes with a surface layer of a densely packed array of unusual cog-shaped CuO microparticles with hierarchical nanofilament-based superstructure (Figure) are prepared by a microemulsion-mediated self-assembly process. The hierarchical superstructure improves the coulombic efficiency, specific capacity and cycling performance compared with anodes based on CuO nanorods, offering new opportunities in the design and performance of lithium-ion batteries.

    14. Chemical Coupling of Carbon Nanotubes and Silicon Nanoparticles for Improved Negative Electrode Performance in Lithium-Ion Batteries (pages 3524–3530)

      Cédric Martin, Olivier Crosnier, Richard Retoux, Daniel Bélanger, Donald M. Schleich and Thierry Brousse

      Article first published online: 18 JUL 2011 | DOI: 10.1002/adfm.201002100

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      Multi-walled carbon nanotube (MWCNT)/silicon nanocomposites obtained by diazonium grafting chemistry are used to prepare silicon negative electrodes for lithium-ion batteries. The covalent bonding of the two compounds, obtained via mono- and multilayers of phenyl bridges, leads to an ideal dispersion of MWCNTs and silicon nanoparticles for improved electrochemical performance of the electrode.

    15. New Silicone Composites for Dielectric Elastomer Actuator Applications In Competition with Acrylic Foil (pages 3531–3539)

      Dorina M. Opris, Martin Molberg, Christian Walder, Yee Song Ko, Beatrice Fischer and Frank A. Nüesch

      Article first published online: 25 JUL 2011 | DOI: 10.1002/adfm.201101039

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      A hydroxyl end-functionalized polydimethylsiloxane was reacted with different crosslinkers and the resulting films were investigated as to their potential use as materials in dielectric elastomer actuators. The silicone showing the best actuation at the lowest electric field was further used as a matrix and compounded with encapsulated polyaniline particles. These composites have enhanced properties including increased strain at break, higher dielectric constant, as well as breakdown fields higher than that of the matrix.

    16. Controlling the Recombination Zone of White Organic Light-Emitting Diodes with Extremely Long Lifetimes (pages 3540–3545)

      Lian Duan, Deqiang Zhang, Kongwu Wu, Xiuqi Huang, Liduo Wang and Yong Qiu

      Article first published online: 25 JUL 2011 | DOI: 10.1002/adfm.201100943

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      Highly stable white organic light-emitting diodes (OLEDs) with a lifetime of around 150 000 hours at 1000 cd m−2 were achieved by wisely controlling the recombination zone. In these long-lived OLEDs, a mixed host blue emitting layer is followed by a blue emitting layer with an electron transporting host to prevent hole injection into the electron transporting layer. The electroluminescent spectra showed almost no color-shifting after accelerated aging.

    17. Patterning of Flexible Transparent Thin-Film Transistors with Solution-Processed ZnO Using the Binary Solvent Mixture (pages 3546–3553)

      Kyongjun Kim, Siyun Park, Jong-Baek Seon, Keon-Hee Lim, Kookheon Char, Kyusoon Shin and Youn Sang Kim

      Article first published online: 29 JUL 2011 | DOI: 10.1002/adfm.201100323

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      Flexible transparent thin-film transistors are patterned with solution-processed ZnO. The flexible TTFT including the patterned ZnO as semiconductor was fabricated onto a plastic substrate using a 200 °C annealing process under ambient conditions, as well as a new developing method with a toluene–methanol mixture as a binary solvent. In developing, the toulene-metahnol mixture induced the uniform and clearly patterned ZnO thin films.

    18. Shape- and Size-Controlled Synthesis of Uniform Anatase TiO2 Nanocuboids Enclosed by Active {100} and {001} Facets (pages 3554–3563)

      Xiaowei Zhao, Wenzui Jin, Jinguang Cai, Jianfeng Ye, Zhenhu Li, Yurong Ma, Jinglin Xie and Limin Qi

      Article first published online: 25 JUL 2011 | DOI: 10.1002/adfm.201100629

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      Uniform, well-defined, tetragonal nanocuboids of anatase TiO2 enclosed by active {100} and {001} facets over a wide size range with controllable aspect ratios are solvothermally synthesized through hydrolysis of titanium tetraisopropoxide, using acetic acid as the solvent and 1-butyl-3-methylimidazolium tetrafluoroborate as the capping agent. The obtained anatase TiO2 nanocuboids exhibit interesting self-assembly behavior, remarkable crystalline phase stability, and enhanced photocatalytic activity.

    19. Wavelength-Emission Tuning of ZnO Nanowire-Based Light-Emitting Diodes by Cu Doping: Experimental and Computational Insights (pages 3564–3572)

      Oleg Lupan, Thierry Pauporté, Tangui Le Bahers, Bruno Viana and Ilaria Ciofini

      Article first published online: 29 JUL 2011 | DOI: 10.1002/adfm.201100258

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      Cu-doped ZnO nanowires are grown epitaxially on Mg-doped p-GaN single-crystalline films. The heterojunction is included in a light-emitting-diode structure and exhibits an intense violet–blue electroluminescent (EL) emission, which is shifted compared to that of pure ZnO. The emission wavelength can be tuned by changing the copper content of the ZnO nanoemitters. The emission shift is explained using density-functional theory calculations and detailed discussions.

    20. Enhanced Structural Stability and Performance Durability of Bulk Heterojunction Photovoltaic Devices Incorporating Metallic Nanoparticles (pages 3573–3582)

      Barbara Paci, George D. Spyropoulos, Amanda Generosi, Daniele Bailo, Valerio Rossi Albertini, Emmanuel Stratakis and Emmanuel Kymakis

      Article first published online: 15 AUG 2011 | DOI: 10.1002/adfm.201101047

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      The incorporation of Ag nanoparticles in bulk heterojunction blends, for organic solar cells, leads to improved structural/morphological properties of the composite active layer and, thus, to better photovoltaic stability after long periods of continuous illumination.

    21. CCVD Synthesis of Carbon-Encapsulated Cobalt Nanoparticles for Biomedical Applications (pages 3583–3588)

      Petar Lukanov, Vijay K. Anuganti, Yulia Krupskaya, Anne-Marie Galibert, Brigitte Soula, Carmen Tilmaciu, Aldrik H. Velders, Ruediger Klingeler, Bernd Büchner and Emmanuel Flahaut

      Article first published online: 15 AUG 2011 | DOI: 10.1002/adfm.201100364

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      Carbon-encapsulated Co nanoparticles (mainly sized between 10 and 15 nm) are synthesized by CCVD. The tight encapsulation is ensured by 2 to 3 concentric graphitic layers. The Co@C nanoparticles exhibit ferromagnetic properties and can be used for both hyperthermia and magnetic resonance imaging (MRI).

    22. A Micromachined Reconfigurable Metamaterial via Reconfiguration of Asymmetric Split-Ring Resonators (pages 3589–3594)

      Yuan Hsing Fu, Ai Qun Liu, Wei Ming Zhu, Xu Ming Zhang, Din Ping Tsai, Jing Bo Zhang, Ting Mei, Ji Fang Tao, Hong Chen Guo, Xin Hai Zhang, Jing Hua Teng, Nikolay I. Zheludev, Guo Qiang Lo and Dim Lee Kwong

      Article first published online: 1 AUG 2011 | DOI: 10.1002/adfm.201101087

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      A micromachined reconfigurable metamaterial is presented by reconfiguring the unit cell that consists of a pair of asymmetric split-ring resonators (ASRRs). The material shows wide dynamic tuning of resonant frequency for transverse electric (TE) and transverse magnetic (TM) polarization by changing the separation distance of the two ASRRs and has potential applications in transformation optics devices, sensors, intelligent detectors, and tunable frequency-selective surfaces.

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