Advanced Materials

Cover image for Vol. 24 Issue 29

August 2, 2012

Volume 24, Issue 29

Pages 3897–4024

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Reviews
    8. Communications
    1. Metal Organic Frameworks: Preparation of Highly Moisture-Resistant Black-Colored Metal Organic Frameworks (Adv. Mater. 29/2012) (page 3897)

      Seung Jae Yang and Chong Rae Park

      Version of Record online: 24 JUL 2012 | DOI: 10.1002/adma.201290175

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      A straightforward method for significantly improving the moisture resistance of metalorganic frameworks (MOFs) is described on page 4010 by Seung Jae Yang and Chong Rae Park. In the proposed method, MOFs are subjected to thermal treatment, inducing the formation of an amorphous carbon coating on the MOF surfaces that prevents hydrolysis. This approach should open up new practical applications for MOFs in areas hitherto unexplored due to concerns regarding moisture sensitivity.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Reviews
    8. Communications
    1. Resistive Switching Memories: Observation of Conductance Quantization in Oxide-Based Resistive Switching Memory (Adv. Mater. 29/2012) (page 3898)

      Xiaojian Zhu, Wenjing Su, Yiwei Liu, Benlin Hu, Liang Pan, Wei Lu, Jiandi Zhang and Run-Wei Li

      Version of Record online: 24 JUL 2012 | DOI: 10.1002/adma.201290176

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      Conductance quantization phenomena in oxide-based resistive switching memories are reported by Xiaojian Zhu, Wei Lu, Run-Wei Li, and co-workers on page 3941. These phenomena were found to relate to the atomic-scale conductive filaments formed in insulating oxides under an applied electrical field. The study shows that the quantum conductance effect can be well modulated and can be used for multi-level data storage.

  3. Back Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Reviews
    8. Communications
    1. Nanoparticles for Imunotherapy: Multivalent Porous Silicon Nanoparticles Enhance the Immune Activation Potency of Agonistic CD40 Antibody (Adv. Mater. 29/2012) (page 4025)

      Luo Gu, Laura E. Ruff, Zhengtao Qin, Maripat Corr, Stephen M. Hedrick and Michael J. Sailor

      Version of Record online: 24 JUL 2012 | DOI: 10.1002/adma.201290177

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      When multiple copies of an antibody to the immunostimulatory receptor CD40 are attached to a nanoparticle of porous silicon, they are able to activate dendritic B cells more effectively than the same number of unbound, free antibodies. Further details can be found in the article by Michael Sailor and co-workers on page 3981.

  4. Masthead

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Reviews
    8. Communications
    1. Masthead: (Adv. Mater. 29/2012)

      Version of Record online: 24 JUL 2012 | DOI: 10.1002/adma.201290178

  5. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Reviews
    8. Communications
  6. Reviews

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Reviews
    8. Communications
    1. Amino Acid Derivatized Arylenediimides: A Versatile Modular Approach for Functional Molecular Materials (pages 3905–3922)

      M. B. Avinash and T. Govindaraju

      Version of Record online: 20 JUN 2012 | DOI: 10.1002/adma.201201544

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      Bio-inspired molecular materials are an emerging area of scientific interest from both fundamental science and technological perspectives. This review focuses on the impressive progress made in recent times in engineering the molecular assemblies of naphthalenediimides and perylenediimides upon derivatization with amino acids and peptides. By this versatile modular approach, arylenediimides have been assembled into several unprecedented molecular systems for various potential applications.

    2. Multifunctional Materials through Modular Protein Engineering (pages 3923–3940)

      Rebecca L. DiMarco and Sarah C. Heilshorn

      Version of Record online: 22 JUN 2012 | DOI: 10.1002/adma.201200051

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      Protein-engineered materials consist of peptide building blocks that are selected for their individual functions. Through modular combination of functionally distinct domains, a virtually limitless frontier of multifunctional materials can be designed to fit the needs of a wide range of biomedical and nanotechnology applications.

  7. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Reviews
    8. Communications
    1. Observation of Conductance Quantization in Oxide-Based Resistive Switching Memory (pages 3941–3946)

      Xiaojian Zhu, Wenjing Su, Yiwei Liu, Benlin Hu, Liang Pan, Wei Lu, Jiandi Zhang and Run-Wei Li

      Version of Record online: 18 JUN 2012 | DOI: 10.1002/adma.201201506

      Thumbnail image of graphical abstract

      Conductance quantization phenomena are observed in oxide-based resistive switching memories. These phenomena can be understood by the formation and disruption of atomic-scale conductive filaments in the insulating oxide matrix. The quantum conductance effect can be artificially modulated by controlling the electrical parameters in Set and Reset processes, and can be used for multi-level data storage and help understand and design one-dimensional structures at atomic scales in various materials systems.

    2. Efficient Polymer Solar Cells Based on a Low Bandgap Semi-crystalline DPP Polymer-PCBM Blends (pages 3947–3951)

      Feng Liu, Yu Gu, Cheng Wang, Wei Zhao, Dian Chen, Alejandro L. Briseno and Thomas P. Russell

      Version of Record online: 12 JUN 2012 | DOI: 10.1002/adma.201200902

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      Solar cell performance and morphology characterization of a diketopyrrolopyrrole-based low bandgap polymer is reported. The polymer adopts an H-type aggregation and solvent mixture processing gives a better morphology. The morphology evolution is characterized by combined GIXD and GISAXS experiments and a four step morphology development mechanism is proposed.

    3. Electron Transfer and Ionic Displacements at the Origin of the 2D Electron Gas at the LAO/STO Interface: Direct Measurements with Atomic-Column Spatial Resolution (pages 3952–3957)

      Claudia Cantoni, Jaume Gazquez, Fabio Miletto Granozio, Mark P. Oxley, Maria Varela, Andrew R. Lupini, Stephen J. Pennycook, Carmela Aruta, Umberto Scotti di Uccio, Paolo Perna and Davide Maccariello

      Version of Record online: 19 JUN 2012 | DOI: 10.1002/adma.201200667

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      Using state-of-the-art, aberration-corrected scanning transmission electron microscopy and electron energy loss spectroscopy with atomic-scale spatial resolution, experimental evidence for an intrinsic electronic reconstruction at the LAO/STO interface is shown. Simultaneous measurements of interfacial electron density and system polarization are crucial for establishing the highly debated origin of the 2D electron gas.

    4. Spontaneous and Fast Growth of Large-Area Graphene Nanofilms Facilitated by Oil/Water Interfaces (pages 3958–3964)

      Shiyu Gan, Lijie Zhong, Tongshun Wu, Dongxue Han, Jingdong Zhang, Jens Ulstrup, Qijin Chi and Li Niu

      Version of Record online: 12 JUN 2012 | DOI: 10.1002/adma.201201098

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      An efficient wet-chemical method based on soft interfacial self-assembly is developed for spontaneous, fast growth of large-area graphene nanofilms on various substrates. The graphene nanofilms produced show tunable optical properties and a highly reversible optoelectronic response. Complementary to chemical vapor deposition, this method could offer a fast, simple, and low-cost chemical strategy to produce graphene nanofilms.

    5. Dielectric-Constant-Enhanced Hall Mobility in Complex Oxides (pages 3965–3969)

      Wolter Siemons, Michael A. McGuire, Valentino R. Cooper, Michael D. Biegalski, Ilia N. Ivanov, Gerald E. Jellison, Lynn A. Boatner, Brian C. Sales and Hans M. Christen

      Version of Record online: 21 JUN 2012 | DOI: 10.1002/adma.201104665

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      The high dielectric constant of doped ferroelectric KTa1-xNbxO3 is shown to increase dielectric screening of electron scatterers, and thus to enhance the electronic mobility, overcoming one of the key limitations in the application of functional oxides. These observations are based on transport and optical measurements as well as band structure calculations.

    6. Engineering ZIF-8 Thin Films for Hybrid MOF-Based Devices (pages 3970–3974)

      Guang Lu, Omar K. Farha, Weina Zhang, Fengwei Huo and Joseph T. Hupp

      Version of Record online: 21 JUN 2012 | DOI: 10.1002/adma.201202116

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      Patterned metal-organic framework, ZIF-8 thin films can be generated by using standard photolithography or via selective growth with the aid of microcontact printing. The alternate chemical deposition (of ZIF-8) and physical deposition (of metallic materials) allow the insertion of metal layers in the ZIF-8 film that could serve as multifunctional chemical sensors for vapors and gases.

    7. Self-Healing of Covalently Cross-Linked Polymers by Reshuffling Thiuram Disulfide Moieties in Air under Visible Light (pages 3975–3980)

      Yoshifumi Amamoto, Hideyuki Otsuka, Atsushi Takahara and Krzysztof Matyjaszewski

      Version of Record online: 22 JUN 2012 | DOI: 10.1002/adma.201201928

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      Self-healing of covalently cross-linked polymers under an ambient visible light in the bulk state, in air, at room temperature using radical exchange of thiuram disulfide units is reported. The successful attachment of surfaces of cut pieces proceeded under ambient conditions under exposure to visible light from a commercial tabletop lamp, as confirmed by bending and tensile tests.

    8. Multivalent Porous Silicon Nanoparticles Enhance the Immune Activation Potency of Agonistic CD40 Antibody (pages 3981–3987)

      Luo Gu, Laura E. Ruff, Zhengtao Qin, Maripat Corr, Stephen M. Hedrick and Michael J. Sailor

      Version of Record online: 12 JUN 2012 | DOI: 10.1002/adma.201200776

      Thumbnail image of graphical abstract

      Porous silicon nanoparticles, each containing multiple copies of an agonistic antibody (blue) to the antigen-presenting cell (APC) receptor CD40 (red), greatly enhance activation of APCs. The much larger (30–40 fold) cellular response to the nanoparticle-bound antibody stimulators is attributed to multivalent interactions between the antibody ensemble and the CD40 targets.

    9. Single-Crystalline Silver Films for Plasmonics (pages 3988–3992)

      Jong Hyuk Park, Palak Ambwani, Michael Manno, Nathan C. Lindquist, Prashant Nagpal, Sang-Hyun Oh, Chris Leighton and David J. Norris

      Version of Record online: 14 JUN 2012 | DOI: 10.1002/adma.201200812

      Thumbnail image of graphical abstract

      A simple route to flat, large-area, single-crystalline films for plasmonics is demonstrated by sputter deposition of silver onto mica substrates at elevated temperatures. The films exhibit improved dielectric properties and allow more precise patterning of high-quality nanostructures for plasmonic applications.

    10. Plasma and Microwave Flash Sintering of a Tailored Silver Nanoparticle Ink, Yielding 60% Bulk Conductivity on Cost-Effective Polymer Foils (pages 3993–3998)

      Jolke Perelaer, Robin Jani, Michael Grouchko, Alexander Kamyshny, Shlomo Magdassi and Ulrich S. Schubert

      Version of Record online: 21 JUN 2012 | DOI: 10.1002/adma.201200899

      Thumbnail image of graphical abstract

      A combination of plasma and microwave flash sintering is used to sinter an inkjet-printed and tailored silver nanoparticle formulation. By using two sintering techniques sequentially, the obtained conductivity is 60%, while keeping the processing temperature well below the glass transition temperature (Tg) of the used polymer substrate. This approach leads to highly conductive features on cost-effective polymer substrates in relatively short times, which are compatible with roll-to-roll (R2R) production. An electroluminescence device is prepared as an example.

    11. Substrate-Free Fabrication of Self-Supporting ZnO Nanowire Arrays (pages 3999–4004)

      Lisheng Wang, Derek Tsan, Boris Stoeber and Konrad Walus

      Version of Record online: 15 JUN 2012 | DOI: 10.1002/adma.201200928

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      Thin films composed of self-supporting ZnO nanowire arrays are fabricated via a hydrothermal approach without the presence of any substrates. The films can be transferred and bonded to an arbitrary substrate for device applications. As a demonstration, a piezoelectric converter is made which is able to generate electric charge under compressive forces.

    12. On the Origin of Contact Resistances of Organic Thin Film Transistors (pages 4005–4009)

      Marko Marinkovic, Dagmawi Belaineh, Veit Wagner and Dietmar Knipp

      Version of Record online: 22 JUN 2012 | DOI: 10.1002/adma.201201311

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      A model is presented that describes the gate-voltage-dependent contact resistance and channel-length-dependent charge carrier mobility of small-molecule-based organic thin-film transistors in top and bottom drain/source contact configuration.

    13. Preparation of Highly Moisture-Resistant Black-Colored Metal Organic Frameworks (pages 4010–4013)

      Seung Jae Yang and Chong Rae Park

      Version of Record online: 15 JUN 2012 | DOI: 10.1002/adma.201200790

      Thumbnail image of graphical abstract

      A straightforward method for significantly improving the moisture resistance of MOFs is described. In the proposed method, MOFs are subjected to thermal treatment, thus inducing the formation of an amorphous carbon coating on the MOF surfaces that prevents hydrolysis. This approach should open up new practical applications for MOFs in areas hitherto unexplored due to concerns regarding moisture sensitivity.

    14. Generation of a Library of Non-Toxic Quantum Dots for Cellular Imaging and siRNA Delivery (pages 4014–4019)

      Prasad Subramaniam, Seung Jae Lee, Shreyas Shah, Sahishnu Patel, Valentin Starovoytov and Ki-Bum Lee

      Version of Record online: 29 JUN 2012 | DOI: 10.1002/adma.201201019

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      The development of non-toxic quantum dots and further investigation of their composition-dependent cytotoxicity in a high-throughput manner have been critical challenges for biomedical imaging and gene delivery. Herein, we report a rapid sonochemical synthetic methodology for generating a library of highly biocompatible ZnS-AgInS2 (ZAIS) quantum dots for cellular imaging and siRNA delivery.

    15. Luminescent Color Conversion on Cyanostilbene-Functionalized Quantum Dots via In-situ Photo-Tuning (pages 4020–4024)

      Liangliang Zhu, Chung Yen Ang, Xin Li, Kim Truc Nguyen, Si Yu Tan, Hans Ågren and Yanli Zhao

      Version of Record online: 21 JUN 2012 | DOI: 10.1002/adma.201200709

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      Photo-responsive CdSe quantum dots functionalized with the cyanostilbene unit are synthesized. The as-prepared quantum dot hybrid reveals a photo-tunable dual fluorescent characteristic. White light emission can be generated in situ from the hybrid through photoirradiation to adjust the relative intensities of the two complementary emissions. Luminescent color conversion through yellow, white, and blue can be realized by varying the photoirradiation time.

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