Advanced Materials

Cover image for Vol. 24 Issue 11

March 15, 2012

Volume 24, Issue 11

Pages 1349–1493

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Review
    7. Progress Report
    8. Frontispiece
    9. Communications
    10. Frontispiece
    11. Communications
    1. Theranostics: Mesoporous Silica-Coated Gold Nanorods as a Light-Mediated Multifunctional Theranostic Platform for Cancer Treatment (Adv. Mater. 11/2012) (page 1349)

      Zhenjiang Zhang, Liming Wang, Jing Wang, Xiumei Jiang, Xiaohui Li, Zhijian Hu, Yinglu Ji, Xiaochun Wu and Chunying Chen

      Version of Record online: 12 MAR 2012 | DOI: 10.1002/adma.201290063

      Thumbnail image of graphical abstract

      On page 1418 X. Wu, C. Chen, and co-workers develop mesoporous silica-coated gold nanorods (Au@SiO2) as a versatile platform for imaging, chemotherapeutics, and hyperthermia. The Au@SiO2 thus keeps both the unique functions of mesoporous silica nanoparticles and gold nanorods, and also provides a new functionality: lightcontrolled drug release. With integrated functions, such multifunctional theranostic systems are critical to optimize therapeutic efficacy and to improve safety of therapeutic regimes. They will provide more opportunities for on-demand therapy, paving the way to personalized medicine.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Review
    7. Progress Report
    8. Frontispiece
    9. Communications
    10. Frontispiece
    11. Communications
    1. Functional Silk: Colored and Luminescent (Adv. Mater. 11/2012) (page 1350)

      Natalia C. Tansil, Leng Duei Koh and Ming-Yong Han

      Version of Record online: 12 MAR 2012 | DOI: 10.1002/adma.201290064

      Thumbnail image of graphical abstract

      The image shows intrinsically multicolored and luminescent silk produced by silkworms that have consumed various fluorescent dyes. Methods to produce such colored and luminescent silks through post-dyeing and biological methods are reviewed on page 1388 by M.-Y. Han and coworkers. In particular, the properties, utility, and versatility of the functional silk are highlighted, as well as the molecular property-dependent incorporation of various materials into silk while it is being secreted by silkworms.

  3. Masthead

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Review
    7. Progress Report
    8. Frontispiece
    9. Communications
    10. Frontispiece
    11. Communications
    1. Masthead: (Adv. Mater. 11/2012)

      Version of Record online: 12 MAR 2012 | DOI: 10.1002/adma.201290065

  4. Contents

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

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Review
    7. Progress Report
    8. Frontispiece
    9. Communications
    10. Frontispiece
    11. Communications
    1. Charge Injection in Solution-Processed Organic Field-Effect Transistors: Physics, Models and Characterization Methods (pages 1357–1387)

      Dario Natali and Mario Caironi

      Version of Record online: 21 FEB 2012 | DOI: 10.1002/adma.201104206

      Thumbnail image of graphical abstract

      A comprehensive overview on the subject of current injection in organic thin-film transistors is given: physical principles concerning energy level (mis)alignment at interfaces, models describing charge injection, technologies for interface tuning, and techniques for characterizing devices. Finally, a survey of the most recent accomplishments in the field is given.

  6. Progress Report

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Review
    7. Progress Report
    8. Frontispiece
    9. Communications
    10. Frontispiece
    11. Communications
    1. Functional Silk: Colored and Luminescent (pages 1388–1397)

      Natalia C. Tansil, Leng Duei Koh and Ming-Yong Han

      Version of Record online: 3 FEB 2012 | DOI: 10.1002/adma.201104118

      Thumbnail image of graphical abstract

      Methods to produce colored and luminescent silk through post-dyeing and biological methods are reviewed. In particular, the properties, utility, and versatility of the functional silk are highlighted, as well as the molecular properties-dependent incorporation of various materials into silk while being secreted by silkworms.

  7. Frontispiece

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Review
    7. Progress Report
    8. Frontispiece
    9. Communications
    10. Frontispiece
    11. Communications
    1. Nitrogen-Enriched Core-Shell Structured Fe/Fe3C-C Nanorods as Advanced Electrocatalysts for Oxygen Reduction Reaction (Adv. Mater. 11/2012) (page 1398)

      Zhenhai Wen, Suqin Ci, Fei Zhang, Xinliang Feng, Shumao Cui, Shun Mao, Shenglian Luo, Zhen He and Junhong Chen

      Version of Record online: 12 MAR 2012 | DOI: 10.1002/adma.201290061

      Thumbnail image of graphical abstract

      Nitrogen-enriched core–shell structured Fe/Fe3C–C (N–Fe/Fe3C@C) nanorods have been successfully synthesized and demonstrated as promising oxygen reduction reaction catalysts with high activity and improved kinetics. The N–Fe/Fe3C@C nanorods, when used as cathode catalysts in microbial fuel cells, outperform the commercial Pt/C-based cathode at the maximum power output. Both N-dopant and core–Fe3C are believed to play key roles for the improved catalytic performance of N–Fe/Fe3C@C. Notably, the N–Fe/Fe3C@C features an ultra-low cost and excellent long-term stability, as discussed by X. L. Feng, Z. He, J. H. Chen and co-workers on page 1399.

  8. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Review
    7. Progress Report
    8. Frontispiece
    9. Communications
    10. Frontispiece
    11. Communications
    1. Nitrogen-Enriched Core-Shell Structured Fe/Fe3C-C Nanorods as Advanced Electrocatalysts for Oxygen Reduction Reaction (pages 1399–1404)

      Zhenhai Wen, Suqin Ci, Fei Zhang, Xinliang Feng, Shumao Cui, Shun Mao, Shenglian Luo, Zhen He and Junhong Chen

      Version of Record online: 6 FEB 2012 | DOI: 10.1002/adma.201104392

      Thumbnail image of graphical abstract

      A cost-effective route for the preparation of Fe3C-based core-shell structured catalysts for oxygen reduction reactions was developed. The novel catalysts generated a much higher power density (i.e., three times higher at Rex of 1 Ω) than the Pt/C in microbial fuel cells. Furthermore, the N-Fe/Fe3C@C features an ultralow cost and excellent long-term stability suitable for mass production.

    2. Reduced Graphene Oxide-Mediated Growth of Uniform Tin-Core/Carbon-Sheath Coaxial Nanocables with Enhanced Lithium Ion Storage Properties (pages 1405–1409)

      Bin Luo, Bin Wang, Minghui Liang, Jing Ning, Xianglong Li and Linjie Zhi

      Version of Record online: 3 FEB 2012 | DOI: 10.1002/adma.201104362

      Thumbnail image of graphical abstract

      Tin-core/carbon-sheath coaxial nanocables directly integrated into a reduced graphene oxide (RGO) surface are constructed by a new strategy involving a RGO-mediated procedure. The as-synthesized nanocables (see figure), with uniform diameter and high aspect ratio, are versatile and exhibit excellent lithium storage properties, as revealed by electrochemical evaluation.

    3. Nanowire Piezo-phototronic Photodetector: Theory and Experimental Design (pages 1410–1417)

      Ying Liu, Qing Yang, Yan Zhang, Zongyin Yang and Zhong Lin Wang

      Version of Record online: 3 FEB 2012 | DOI: 10.1002/adma.201104333

      Thumbnail image of graphical abstract

      The piezo-phototronic effect is about the use of the inner crystal piezoelectric potential to tune/control charge carrier generation, separation, transport and/or recombination in optoelectronic devices. In this paper, a theoretical model for describing the characteristics of a metal-nanowire-metal structured piezo-phototronic photodetector is constructed. Numerical simulations fit well to the experimental results of a CdS and ZnO nanowire based visible and UV detector, respectively.

    4. Mesoporous Silica-Coated Gold Nanorods as a Light-Mediated Multifunctional Theranostic Platform for Cancer Treatment (pages 1418–1423)

      Zhenjiang Zhang, Liming Wang, Jing Wang, Xiumei Jiang, Xiaohui Li, Zhijian Hu, Yinglu Ji, Xiaochun Wu and Chunying Chen

      Version of Record online: 9 FEB 2012 | DOI: 10.1002/adma.201104714

      Thumbnail image of graphical abstract

      Mesoporous silica-coated gold nanorods (Au@SiO2) are developed as a promising and versatile theranostic platform for cancer treatment. Intracellular localization of Au@SiO2 is visualized through two-photon imaging. With doxorubicin hydrochloride loaded, Au@SiO2–DOX show two light-mediated therapeutic modes: low power density laser-triggered drug release for chemotherapy, and high power density laser-induced hyperthermia, which suggest the potential for in-vivo applications.

    5. Engineering the Formation of Secondary Building Blocks within Hollow Interiors (pages 1424–1428)

      Xiaobo Li, Xiao Liu, Yi Ma, Mingrun Li, Jiao Zhao, Hongchuan Xin, Lei Zhang, Yan Yang, Can Li and Qihua Yang

      Version of Record online: 17 FEB 2012 | DOI: 10.1002/adma.201104167

      Thumbnail image of graphical abstract

      Secondary building blocks within the cavities of primary silica-architecture building blocks are successfully engineered. The immobilized surfactant directs the selective dissolution and reassembly of dissolved silicate species for the formation of secondary building blocks (hollow nanospheres/nanorods; see figure). Supported TiO2 on nanostructures with multilevel interiors is shown to exhibit significantly enhanced activity in photocatalytic H2 production.

    6. Magnetic Contrast in Phase-Change Materials Doped with Fe Impurities (pages 1429–1433)

      Yan Li and Riccardo Mazzarello

      Version of Record online: 13 FEB 2012 | DOI: 10.1002/adma.201104746

      Thumbnail image of graphical abstract

      Ab initio simulation of the transition from the crystalline to the amorphous phase of a phase-change material doped with Fe impurities. The structural and magnetic properties of both phases are studied and a link is provided between the magnetic contrast recently observed in these materials and the drastic change in local order which occurs during amorphization.

    7. Vapor Diffusion Sol-Gel Synthesis of Fluorescent Perovskite Oxide Nanocrystals (pages 1434–1438)

      Federico A. Rabuffetti, John S. Lee and Richard L. Brutchey

      Version of Record online: 8 FEB 2012 | DOI: 10.1002/adma.201104645

      Thumbnail image of graphical abstract

      A model system consisting of Eu3+ as the activator ion and BaZrO3 as the host lattice is employed to demonstrate the potential of the vapor diffusion sol−gel method as a hydrolytic approach to the synthesis of fluorescent alkaline-earth perovskite oxide nanocrystals under ultrabenign conditions. The resulting nanocrystals are suitable precursors for nanostructured red-emitting phosphors.

    8. Sulfur-Tolerant Redox-Reversible Anode Material for Direct Hydrocarbon Solid Oxide Fuel Cells (pages 1439–1443)

      Chenghao Yang, Zhibin Yang, Chao Jin, Guoliang Xiao, Fanglin Chen and Minfang Han

      Version of Record online: 9 FEB 2012 | DOI: 10.1002/adma.201104852

      Thumbnail image of graphical abstract

      A novel composite anode material consisting of K2NiF4-type structured Pr0.8Sr1.2(Co,Fe)0.8Nb0.2O4+δ (K-PSCFN) matrix with homogenously dispersed nano-sized Co-Fe alloy (CFA) has been obtained by annealing perovskite Pr0.4Sr0.6Co0.2Fe0.7Nb0.1O3-δ (P-PSCFN) in H2 at 900 °C. The K-PSCFN-CFA composite anode is redox-reversible and has demonstrated similar catalytic activity to Ni-based cermet anode, excellent sulfur tolerance, remarkable coking resistance and robust redox cyclability.

  9. Frontispiece

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Review
    7. Progress Report
    8. Frontispiece
    9. Communications
    10. Frontispiece
    11. Communications
    1. Tissue Engineering: Osteophilic Multilayer Coatings for Accelerated Bone Tissue Growth (Adv. Mater. 11/2012) (page 1444)

      Nisarg J. Shah, Jinkee Hong, Md. Nasim Hyder and Paula T. Hammond

      Version of Record online: 12 MAR 2012 | DOI: 10.1002/adma.201290062

      Thumbnail image of graphical abstract

      The development of stable skeletal joint prostheses - con-formal, nanoscale electrostatic coatings capable of de novo bone regeneration - is reported by P. T. Hammond and co-workers on page 1445. These coatings contain a combination of hydroxyapatite and bone growth factor, components which are present in and which regulate the structure of the bone. Osteoblast cells adhere to these coatings and lay down new bone on and around the implant for stable bonding with the surrounding bone tissue.

  10. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Review
    7. Progress Report
    8. Frontispiece
    9. Communications
    10. Frontispiece
    11. Communications
    1. Osteophilic Multilayer Coatings for Accelerated Bone Tissue Growth (pages 1445–1450)

      Nisarg J. Shah, Jinkee Hong, Md. Nasim Hyder and Paula T. Hammond

      Version of Record online: 7 FEB 2012 | DOI: 10.1002/adma.201104475

      Thumbnail image of graphical abstract

      Osteophilic modular nanostructured multilayers containing hydroxyapatite nanoparticles complexed with a natural polymer chitosan create an osteoconductive surface for mesenchymal stem cells (MSCs). Coupled with the sustained release of physiological amounts of osteoinductive bone morphogenetic protein over several days from degradable poly(β-amino ester) based multilayers, this single coating results in a synergistic accelerated and upregulated differentiation of MSCs into osteoblasts laying down new bone tissue on orthopedic implants.

    2. Photochemical Disruption of Polyelectrolyte Multilayers (pages 1451–1454)

      Damla Koylu, Mahesh Thapa, Patricia Gumbley and Samuel W. Thomas III

      Version of Record online: 6 FEB 2012 | DOI: 10.1002/adma.201104865

      Thumbnail image of graphical abstract

      Photoreactive polyelectrolyte multilayers (PEMs) that dissolve upon UV irradiation are described. Light-induced switching of the formal charge of a photoreactive polycation resulted in repulsive interlayer electrostatic forces, and caused the dissolution of PEM films. Combining both photoreactive and inert polycations in the same film yielded additional control over the light-induced change in film thickness.

    3. Tuning the Energy Level Offset between Donor and Acceptor with Ferroelectric Dipole Layers for Increased Efficiency in Bilayer Organic Photovoltaic Cells (pages 1455–1460)

      Bin Yang, Yongbo Yuan, Pankaj Sharma, Shashi Poddar, Rafal Korlacki, Stephen Ducharme, Alexei Gruverman, Ravi Saraf and Jinsong Huang

      Version of Record online: 13 FEB 2012 | DOI: 10.1002/adma.201104509

      Thumbnail image of graphical abstract

      Ultrathin ferroelectric polyvinylidene fluoride (70%)-tetrafluoroethylene (30%) copolymer film is inserted between the poly3(hexylthiophene) (P3HT) donor and [6,6]-phenyl-C61-butyric acid methylester (PCBM) acceptor layers as the dipole layer to tune the relative energy levels, which can potentially maximize the open circuit voltage of bilayer organic solar cells. In this work, the power conversion efficiency of P3HT/PCBM bilayer solar cells is demonstrated to be doubled with the inserted dipoles.

    4. Linear Self-Assembly of Nanoparticles Within Liquid Crystal Defect Arrays (pages 1461–1465)

      Delphine Coursault, Johan Grand, Bruno Zappone, Habib Ayeb, Georges Lévi, Nordin Félidj and Emmanuelle Lacaze

      Version of Record online: 9 FEB 2012 | DOI: 10.1002/adma.201103791

      Thumbnail image of graphical abstract

      In the presence of oriented smectic liquid crystal defects, hybrid systems of nanoparticles/liquid crystals form straight chains of nanoparticles of length longer than tens of micrometers and width equal to one single nanoparticle. The interparticle distance in a chain can be varied between a few micrometers and 1.5 nm, highlighting the control of optical absorption by light polarization monitored by gold nanoparticle concentration.

    5. Density Gradient Multilayer Polymerization for Creating Complex Tissue (pages 1466–1470)

      Jerome V. Karpiak, Yogesh Ner and Adah Almutairi

      Version of Record online: 9 FEB 2012 | DOI: 10.1002/adma.201103501

      Thumbnail image of graphical abstract

      An adaptable density gradient multilayer polymerization (DGMP) method facilitates simple fabrication of complex multicompartment scaffolds with structurally continuous interfaces. Solvent density liquid-liquid phase segregation compartmentalizes varied mechanical and chemical cues independently. Bulk photopolymerization produces stratified three-dimensional and two-dimensional matrices. Cells attach to patterned adhesion peptides on biomimetic 2D substrates.

    6. Quantitative Analysis of the Role of the First Layer in p- and n-Type Organic Field-Effect Transistors with Graphene Electrodes (pages 1471–1475)

      Yugeng Wen, Jianyi Chen, Lei Zhang, Xiangnan Sun, Yan Zhao, Yunlong Guo, Gui Yu and Yunqi Liu

      Version of Record online: 17 FEB 2012 | DOI: 10.1002/adma.201104055

      Thumbnail image of graphical abstract

      Efficient field-effect mobilities measured from both p- and n-type organic monolayer field-effect transistors that utilize graphene electrodes permit quantitative analysis of the role of the first layer. Information about the relationship between the kinetics of the diffusion process and film morphology of the first layer during the increasing substrate temperature, and correlations of field-effect mobilities of the first monolayer and the substrate temperature is obtained.

    7. High-Performance Inverted Polymer Solar Cells with Solution-Processed Titanium Chelate as Electron-Collecting Layer on ITO Electrode (pages 1476–1481)

      Zhan'ao Tan, Wenqing Zhang, Zhiguo Zhang, Deping Qian, Ye Huang, Jianhui Hou and Yongfang Li

      Version of Record online: 12 MAR 2012 | DOI: 10.1002/adma.201104863

      Thumbnail image of graphical abstract

      High-performance inverted polymer solar cells (PSCs) with solution-processed titanium chelate TIPD as electron collecting layer are reported. The power conversion efficiency (PCE) of the inverted PSC with a-TIPD buffer layer with thermal annealing at 150 °C for 10 min reached 7.4% under the illumination of AM1.5, 100 mW/cm2, which is increased by 16% in comparison with that (6.4%) of the device in the conventional structure. The PCE of 7.4% is the highest among the inverted PSCs reported so far in the literature.

    8. New Secrets of Spider Silk: Exceptionally High Thermal Conductivity and Its Abnormal Change under Stretching (pages 1482–1486)

      Xiaopeng Huang, Guoqing Liu and Xinwei Wang

      Version of Record online: 5 MAR 2012 | DOI: 10.1002/adma.201104668

      Thumbnail image of graphical abstract

      Two new significant discoveries are reported: i) the dragline silk of N. clavipes spider has an exceptionally high thermal conductivity: up to 416 W/m·K that beats most materials; ii) contrary to normal materials, its thermal conductivity increases with strain (19% increase under ∼20% strain). These new findings will revolutionize the design of polymer fibers to increase their thermal conductivity by orders of magnitude.

    9. Molecularly Controlled Interfacial Layer Strategy Toward Highly Efficient Simple-Structured Organic Light-Emitting Diodes (pages 1487–1493)

      Tae-Hee Han, Mi-Ri Choi, Seong-Hoon Woo, Sung-Yong Min, Chang-Lyoul Lee and Tae-Woo Lee

      Version of Record online: 17 FEB 2012 | DOI: 10.1002/adma.201104316

      Thumbnail image of graphical abstract

      A highly efficient simplified organic light-emitting diode (OLED) with a molecularly controlled strategy to form near-perfect interfacial layer on top of the anode is demonstrated. A self-organized polymeric hole injection layer (HIL) is exploited increasing hole injection, electron blocking, and reducing exciton quenching near the electrode or conducting polymers; this HIL allows simplified OLED comprised a single small-molecule fluorescent layer to exhibits a high current efficiency (∼20 cd/A).

SEARCH

SEARCH BY CITATION