Advanced Functional Materials

Cover image for Vol. 21 Issue 15

August 9, 2011

Volume 21, Issue 15

Pages 2797–2996

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Feature Article
    6. Full Papers
    7. Frontispiece
    8. Full Papers
    1. Memory Devices: Organic Resistive Memory Devices: Performance Enhancement, Integration, and Advanced Architectures (Adv. Funct. Mater. 15/2011) (page 2797)

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

      Article first published online: 4 AUG 2011 | DOI: 10.1002/adfm.201190059

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      Organic resistive memory has been extensively investigated as a promising memory technology due to technical advantages such as its simple structure, low fabrication cost, and printing applicability as well as exceptional memory performances. In their Feature Article, on page 2806, Takhee Lee and co-workers focus in particular on important strategies to implement more practical memory applications in terms of performance, integration, and architectures.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Feature Article
    6. Full Papers
    7. Frontispiece
    8. Full Papers
    1. Micropatterning: Fabrication of Multifaceted Micropatterned Surfaces with Laser Scanning Lithography (Adv. Funct. Mater. 15/2011) (page 2798)

      John H. Slater, Jordan S. Miller, Shann S. Yu and Jennifer L. West

      Article first published online: 4 AUG 2011 | DOI: 10.1002/adfm.201190060

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      The implementation of engineered surfaces with micrometer-sized patterns of cell adhesive ligands against a biologically inert background has led to numerous discoveries in fundamental cell biology. On page 2876, Jennifer L. West and co-workers present a laser-based patterning strategy for the fabrication of surfaces displaying multiple patterned ligands, where each ligand is confined to its own array. Cells cultured on surfaces with two ligands display concurrent adhesion to both ligands simultaneously and utilize both ligands for lamella formation during migration.

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Feature Article
    6. Full Papers
    7. Frontispiece
    8. Full Papers
    1. Contents: (Adv. Funct. Mater. 15/2011) (pages 2799–2805)

      Article first published online: 4 AUG 2011 | DOI: 10.1002/adfm.201190061

  4. Feature Article

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Feature Article
    6. Full Papers
    7. Frontispiece
    8. Full Papers
    1. Organic Resistive Memory Devices: Performance Enhancement, Integration, and Advanced Architectures (pages 2806–2829)

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

      Article first published online: 8 JUL 2011 | DOI: 10.1002/adfm.201100686

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      Recently, organic resistive memory devices, which have many advantages including simple device structures, low fabrication costs, and printability, have been extensively investigated. The focus of this Feature Article is on essential strategies for memory performance enhancement, high-density integration, and advanced architectural concepts necessary for future memory applications.

      Corrected by:

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

      Vol. 21, Issue 18, 3406, Article first published online: 20 SEP 2011

  5. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Feature Article
    6. Full Papers
    7. Frontispiece
    8. Full Papers
    1. A Multifuntional Nanoplatform Based on Responsive Fluorescent Plasmonic ZnO-Au@PEG Hybrid Nanogels (pages 2830–2839)

      Weitai Wu, Jing Shen, Probal Banerjee and Shuiqin Zhou

      Article first published online: 31 MAY 2011 | DOI: 10.1002/adfm.201100201

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      With a PEG-based gel serving as a 3D scaffold, the strong fluorescence of semiconductor quantum dots and the plasmonics of metallic gold are combined into a sub-100-nm thermosensitive nano-object for multiple functions: a high-resolution biosensor for temperature sensing over physiological ranges, a fluorescent agent for tumor-cell imaging, and a drug carrier for synergistic chemo-photothermal treatment. This results in a nanoplatform that can execute diagnosis, therapy, and monitoring simultaneously.

    2. Electrochemically Induced High Capacity Displacement Reaction of PEO/MoS2/Graphene Nanocomposites with Lithium (pages 2840–2846)

      Jie Xiao, Xiaojian Wang, Xiao-Qing Yang, Shidi Xun, Gao Liu, Phillip K. Koech, Jun Liu and John P. Lemmon

      Article first published online: 4 MAY 2011 | DOI: 10.1002/adfm.201002752

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      The reversible displacement reaction of a MoS2/PEO/graphene nanocomposite with lithium was systematically investigated. Crystalline Li2S and amorphous Mo formed during electrochemical lithiation. The incorporation of PEO stabilizes the reversibility of the reaction and contributes to increased ionic conductivity. The irreversible reduction of Mo4+ to Mo nanoparticles along with the addition of graphene improves the electronic conductivity of the nanocomposite allowing for high rate cycling. The mechanism provides insight into the activation and design of high-performance electrode materials for energy storage.

    3. A Microfluidic Chip with Integrated Colloidal Crystal for Online Optical Analysis (pages 2847–2853)

      Siew-Kit Hoi, Xiao Chen, Vanga Sudheer Kumar, Sureerat Homhuan, Chorng-Haur Sow and Andrew A. Bettiol

      Article first published online: 4 MAY 2011 | DOI: 10.1002/adfm.201002632

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      A microfluidic chip that incorporates colloidal crystals inside a microchannel system for online analysis is demonstrated. Colloidal crystals with varying filtering effects have been integrated into lab-on-a-chip devices to locally enable the selective transmission or blocking of a particular range of wavelengths. Combined double-band colloidal crystals enable further tunability of the stop bands for filtering applications.

    4. Light-Emitting Field-Effect Transistors Consisting of Bilayer-Crystal Organic Semiconductors (pages 2854–2860)

      Kentaro Kajiwara, Kohei Terasaki, Takeshi Yamao and Shu Hotta

      Article first published online: 19 MAY 2011 | DOI: 10.1002/adfm.201100474

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      A novel organic light-emitting field-effect transistors is presented, consisting of bilayer-crystal organic semiconductors of a p-type and an n-type. In the devices, we observe strong emissions with maximum emission intensities that are larger by hundred times than those of single-layer crystal devices of each type. Emissions come from both of the crystals. The external quantum efficiency of the bilayer devices reaches 0.045%.

    5. Conditional DNA-Protein Interactions Confer Stimulus-Sensing Properties to Biohybrid Materials (pages 2861–2867)

      Erik H. Christen, Maria Karlsson, Michael M. Kämpf, Ronald Schoenmakers, Raphael J. Gübeli, Hanna M. Wischhusen, Christian Friedrich, Martin Fussenegger and Wilfried Weber

      Article first published online: 25 MAY 2011 | DOI: 10.1002/adfm.201100731

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      A biohybrid hydrogel is synthesized for the drug-inducible release of biopharmaceuticals. The hydrogel consists of linear polyacrylamide crosslinked by the interaction of the tetracycline repressor scTetR with its target DNA sequence tetO. Addition of tetracycline dissociates the protein-DNA interaction and triggers the release of a previously embedded payload protein.

    6. A Highly Efficient Electrochemical Biosensing Platform by Employing Conductive Nanocomposite Entrapping Magnetic Nanoparticles and Oxidase in Mesoporous Carbon Foam (pages 2868–2875)

      Moon Il Kim, Youngjin Ye, Byoung Yeon Won, Sujeong Shin, Jinwoo Lee and Hyun Gyu Park

      Article first published online: 27 MAY 2011 | DOI: 10.1002/adfm.201100344

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      A conductive multi-catalyst system consisting of Fe3O4 magnetic nano-particles (MNPs) and oxidative enzyme co-entrapped in the pores of mesoporous carbon is developed as an efficient and robust electrochemical biosensing platform. Immobilized MNPs in MSU-F-C show a high catalytic efficiency as peroxidase and enable the rapid detection of hydrogen peroxide and phenolic compounds.

    7. Fabrication of Multifaceted Micropatterned Surfaces with Laser Scanning Lithography (pages 2876–2888)

      John H. Slater, Jordan S. Miller, Shann S. Yu and Jennifer L. West

      Article first published online: 31 MAY 2011 | DOI: 10.1002/adfm.201100297

      Thumbnail image of graphical abstract

      A laser-based patterning strategy for the fabrication of multifaceted, micropatterned surfaces that display patterned arrays of multiple cell adhesive ligands with each ligand confined to its own array is presented. Cells cultured on these surfaces display concurrent adhesion to both ligands simultaneously and utilize both ligands for lamella formation during migration.

    8. Genetically Engineered Chimeric Silk–Silver Binding Proteins (pages 2889–2895)

      Heather A. Currie, Olivier Deschaume, Rajesh R. Naik, Carole C. Perry and David L. Kaplan

      Article first published online: 27 MAY 2011 | DOI: 10.1002/adfm.201100249

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      Genetically engineered spider silk was modified to incorporate a short peptide sequence to nucleate silver ions. The resulting hybrid protein combines the strength and biocompatibility of silk with nucleation of silver ions for antimicrobial functions. The table of contents figure shows: a) silver nanoparticles formed on the surface of the silk protein, b) inhibition of microbial growth.

    9. Electroactive Self-Assembled Monolayers for Enhanced Efficiency and Stability of Electropolymerized Luminescent Films and Devices (pages 2896–2900)

      Ying Lv, Liang Yao, Cheng Gu, Yuanxiang Xu, Dandan Liu, Dan Lu and Yuguang Ma

      Article first published online: 30 MAY 2011 | DOI: 10.1002/adfm.201100467

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      The first use of carbazolyl thiol SAM to modify Au electrode is reported. Luminescent electropolymerization (EP) films are then grafted onto the electrode to prepare highly efficient and stable EP devices. The electroactive SAM can enhance the work function of the electrode and promote the cross-linking efficiency and the adhesion of EP films. This simple approach has potential applications in display devices.

    10. Ionic Space-Charge Depletion in Lithium Fluoride Thin Films on Sapphire (0001) Substrates (pages 2901–2905)

      Chilin Li, Xiangxin Guo, Lin Gu, Dominik Samuelis and Joachim Maier

      Article first published online: 30 MAY 2011 | DOI: 10.1002/adfm.201100303

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      Thickness-dependent measurements of lithium fluoride thin films grown on c-plane sapphire substrates allow the separation of bulk and interface conductions. The normalized conductance decreases linearly with decreasing LiF layer thickness with a negative extrapolated intercept. It indicates depletion of lithium ion vacancies as majority charge carriers and hence a negative space-charge potential. A generalized Mott–Schottky approach within the model of heterogeneous doping fully explains the entire boundary defect chemistry.

    11. Solid Free-Form Fabrication of Tissue-Engineering Scaffolds with a Poly(lactic-co-glycolic acid) Grafted Hyaluronic Acid Conjugate Encapsulating an Intact Bone Morphogenetic Protein–2/Poly(ethylene glycol) Complex (pages 2906–2912)

      Jung Kyu Park, Jin-Hyung Shim, Kyung Shin Kang, Junseok Yeom, Ho Sang Jung, Jong Young Kim, Keum Hong Lee, Tae-Ho Kim, Shin-Yoon Kim, Dong-Woo Cho and Sei Kwang Hahn

      Article first published online: 4 JUL 2011 | DOI: 10.1002/adfm.201100612

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      Sustained release and bone regeneration: Solid free-form fabrication of tissue- engineering scaffold is successfully carried out with a poly(lactic-co-glycolic acid) grafted hyaluronic acid (HA-PLGA) conjugate encapsulating an intact bone morphogenetic protein–2/poly(ethylene glycol) (BMP-2/PEG) complex. In vitro release tests confirm the sustained release of intact BMP-2 from the scaffolds for up to a month. Furthermore, microcomputed tomography and histological analysis reveal effective bone regeneration on the HA-PLGA/PEG/BMP-2 scaffolds implanted into calvarial bone defects of Sprague Dawley rats.

    12. Photodriven, Flexural–Torsional Oscillation of Glassy Azobenzene Liquid Crystal Polymer Networks (pages 2913–2918)

      Kyung Min Lee, Matthew L. Smith, Hilmar Koerner, Nelson Tabiryan, Richard A. Vaia, Timothy J. Bunning and Timothy J. White

      Article first published online: 7 JUN 2011 | DOI: 10.1002/adfm.201100333

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      Flexural–torsional oscillations consisting of in-plane bending and out-of-plane twisting are observed in cantilevers composed of monodomain, photoresponsive liquid crystal polymers with the nematic director offset at intermediate angles to the long axis of the cantilever.

  6. Frontispiece

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Feature Article
    6. Full Papers
    7. Frontispiece
    8. Full Papers
    1. Cell-Exclusion Patterning: Rehydration of Polymeric, Aqueous, Biphasic System Facilitates High Throughput Cell Exclusion Patterning for Cell Migration Studies (Adv. Funct. Mater. 15/2011) (page 2919)

      Hossein Tavana, Kerim Kaylan, Tommaso Bersano-Begey, Kathryn E. Luker, Gary D. Luker and Shuichi Takayama

      Article first published online: 4 AUG 2011 | DOI: 10.1002/adfm.201190062

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      A new cell-exclusion patterning technique is presented by Shuichi Takayama and co-workers on page 2920. Rehydration of dried polymeric aqueous two-phase systems results in well-defined cell-excluded circular gaps within a cell monolayer to serve as a migration niche for cells. The utility of this approach is demonstrated for high-throughput quantitative cancer-cell migration studies.

  7. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Feature Article
    6. Full Papers
    7. Frontispiece
    8. Full Papers
    1. Rehydration of Polymeric, Aqueous, Biphasic System Facilitates High Throughput Cell Exclusion Patterning for Cell Migration Studies (pages 2920–2926)

      Hossein Tavana, Kerim Kaylan, Tommaso Bersano-Begey, Kathryn E. Luker, Gary D. Luker and Shuichi Takayama

      Article first published online: 24 MAY 2011 | DOI: 10.1002/adfm.201002559

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      Utilizing rehydration of dried polymeric aqueous two-phase systems, well-defined cell-excluded circular gaps are patterned within a cell monolayer to serve as migration niche for cells. The utility of this approach is demonstrated for high throughput quantitative cancer cell migration studies.

    2. Three-Level Biomimetic Rice-Leaf Surfaces with Controllable Anisotropic Sliding (pages 2927–2932)

      Dong Wu, Jian-Nan Wang, Si-Zhu Wu, Qi-Dai Chen, Shuai Zhao, Hao Zhang, Hong-Bo Sun and Lei Jiang

      Article first published online: 3 MAY 2011 | DOI: 10.1002/adfm.201002733

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      A new model to interpret the anisotropic sliding behavior of the rice leaf is proposed based on three-level microstructures (macrogrooves, micropapilla, and nanostructures). The three-level hierarchical surfaces were reproduced by combining photolithography, PDMS imprinting, and micro/nanostructure coating, and a new method was developed, named curvature-assisted droplet oscillation (CADO), to quantitatively characterize the weak frictional interaction between the liquid droplet and the structured surface.

    3. Single-Electron Tunneling through Molecular Quantum Dots in a Metal-Insulator-Semiconductor Structure (pages 2933–2937)

      Ryoma Hayakawa, Nobuya Hiroshiba, Toyohiro Chikyow and Yutaka Wakayama

      Article first published online: 24 MAY 2011 | DOI: 10.1002/adfm.201100220

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      Single-electron tunneling via molecular quantum dots is successfully demonstrated in a practical device configuration of a metal-insulator-semiconductor structure. The phenomenon is observable up to 280 K, which is almost room temperature. Based on these attractive features, our device can be regarded as a prototype device for “More than Moore”, in which molecular functionalities can be integrated into Si-based devices.

    4. Streptavidin-Functionalized Silver-Nanoparticle-Enriched Carbon Nanotube Tag for Ultrasensitive Multiplexed Detection of Tumor Markers (pages 2938–2943)

      Guosong Lai, Jie Wu, Huangxian Ju and Feng Yan

      Article first published online: 26 MAY 2011 | DOI: 10.1002/adfm.201100396

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      A streptavidin-functionalized silver-nano-particle-enriched carbon nanotube is designed as a trace tag for ultrasensitive multiplexed detection of tumor markers by combination with silver-deposition enhancement and electrochemical stripping analysis of silver nanoparticles on a disposable immunosensor array. The excellent analytical performance of this method demonstrates that the functionalized nanohybrid is a promising and versatile amplified probe for application in biotechnology.

    5. Highly Efficient Solid-State Dye-Sensitized Solar Cells Based on Triphenylamine Dyes (pages 2944–2952)

      Xiao Jiang, Karl Martin Karlsson, Erik Gabrielsson, Erik M. J. Johansson, Maria Quintana, Martin Karlsson, Licheng Sun, Gerrit Boschloo and Anders Hagfeldt

      Article first published online: 24 MAY 2011 | DOI: 10.1002/adfm.201002319

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      Organic dye sensitizers D35 and M14 have been employed in both liquid and solid state DSCs. This study shows that careful modifications in dye structure with high extinction coefficient as well as suitable surface blocking behavior will lead to more efficient sensitizers for DSCs.

    6. Materials Surgery – Reactivity Differences of Organic Groups in Hybrids (pages 2953–2959)

      Sebastian Polarz, Felix Jeremias and Ulrich Haunz

      Article first published online: 31 MAY 2011 | DOI: 10.1002/adfm.201100802

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      Plastic surgery on the nanoscale: Functionalized pockets inside the pore walls of periodically ordered mesoporous organosilicas can be created by the scission of ethylene-containing bridging groups. However, one needs to be highly aware of the influence of the inorganic matrix. An in situ solid-state NMR spectroscopy study showed that total amputation resulting in a topotactic transformation is caused by the α-silicon effect.

    7. A Nanoimprint Lithography Hybrid Photoresist Based on the Thiol–Ene System (pages 2960–2967)

      Hong Lin, Xia Wan, Xuesong Jiang, Qingkang Wang and Jie Yin

      Article first published online: 3 JUN 2011 | DOI: 10.1002/adfm.201100692

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      A novel hybrid resist based on the thiol–ene photopolymerization is presented here. Our system is comprised of mercaptopropyl polyhedral oligomeric silsesquioxane and benzyl methacrylate, with trimethylolpropane trimethacrylate as the crosslinker. The obtained hybrid resists possess a variety of characteristics desirable for UV nanoimprint lithography, such as low viscosity, low bulk-volumetric shrinkage, high Young's modulus, high thermal stability, and excellent dry-etch resistance.

    8. Serum Protein Controlled Nanoparticle Synthesis (pages 2968–2977)

      David C. Bassett, Liam M. Grover, Frank A. Müller, Marc D. McKee and Jake E. Barralet

      Article first published online: 24 MAY 2011 | DOI: 10.1002/adfm.201100320

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      Control of the amorphous state by serum proteins is essential for homeostasis and mineralization processes in vivo. For the first time, the ability of the three most abundant serum proteins to stabilise the amorphous state of three key calcium biominerals is compared. Their effect on the formation of functional nanostructured gold particles that can be used as a biosensing device is also investigated.

    9. Spontaneous Formation of Liquid Crystals in Ultralarge Graphene Oxide Dispersions (pages 2978–2988)

      Seyed Hamed Aboutalebi, Mohsen Moazzami Gudarzi, Qing Bin Zheng and Jang-Kyo Kim

      Article first published online: 3 JUN 2011 | DOI: 10.1002/adfm.201100448

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      Spontaneous formation of lyotropic nematic liquid crystals is identified upon the addition of ultralarge graphene oxide sheets (with an aspect ratio of over 30 000) to water above a critical concentration of about 0.1 wt%. Self-assembled, free-standing GO papers with a highly aligned layered structure are fabricated by simple casting of graphene oxide liquid-crystal dispersions.

    10. One-Step Electrochemical Synthesis of Graphene/Polyaniline Composite Film and Its Applications (pages 2989–2996)

      Xiao-Miao Feng, Rui-Mei Li, Yan-Wen Ma, Run-Feng Chen, Nai-En Shi, Qu-Li Fan and Wei Huang

      Article first published online: 3 JUN 2011 | DOI: 10.1002/adfm.201100038

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      A new one-step electrochemical synthesis of graphene/polyaniline composite films was developed using graphite oxide and aniline as the starting materials. Horseradish peroxidase was entrapped onto the film-modified electrode and used to construct a H2O2 biosensor. A supercapacitor was also fabricated based on the composite film.

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