Advanced Materials

Cover image for Vol. 24 Issue 19

May 15, 2012

Volume 24, Issue 19

Pages 2509–2648

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Reviews
    7. Communications
    1. Self-Healing: A Self-healing Conductive Ink (Adv. Mater. 19/2012) (page 2509)

      Susan A. Odom, Sarut Chayanupatkul, Benjamin J. Blaiszik, Ou Zhao, Aaron C. Jackson, Paul V. Braun, Nancy R. Sottos, Scott R. White and Jeffrey S. Moore

      Article first published online: 9 MAY 2012 | DOI: 10.1002/adma.201290109

      Thumbnail image of graphical abstract

      S. R. White, J. S. Moore, and co-workers show on page 2578 how solvent is released from core–shell microcapsules after scratch damage to a capsule-containing polymer layer and conductive silver ink. The release of the solvent enables the redistribution of the silver particles within the conductive ink, which contains a soluble polymer binder, allowing the autonomic restoration of conductivity to a damaged circuit.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Reviews
    7. Communications
    1. Emulsions: Magnetic Transport, Mixing and Release of Cargo with Tailored Nanoliter Droplets (Adv. Mater. 19/2012) (page 2510)

      Jonathan S. Sander, Randall M. Erb, Claude Denier and André R. Studart

      Article first published online: 9 MAY 2012 | DOI: 10.1002/adma.201290110

      Thumbnail image of graphical abstract

      Magnetically responsive nanoliter droplets enable on-demand release of encapsulated cargo using magnetic fields as an external trigger, say A. R. Studart and co-workers on page 2582. The droplets are made from monodisperse double emulsions produced in a glass capillary micro-fluidic device. Magnetic response is achieved by adding superparamagnetic nanoparticles to the inner or intermediate phase of the double emulsion. For emulsions with tuned stability, it is possible to manipulate, collect, chain, and coalesce the droplets for on-demand cargo release by modulating the external magnetic field.

  3. Masthead

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Reviews
    7. Communications
    1. Masthead: (Adv. Mater. 19/2012)

      Article first published online: 9 MAY 2012 | DOI: 10.1002/adma.201290111

  4. Contents

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

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Reviews
    7. Communications
    1. Thinning and Shaping Solid Films into Functional and Integrative Nanomembranes (pages 2517–2546)

      Gaoshan Huang and Yongfeng Mei

      Article first published online: 18 APR 2012 | DOI: 10.1002/adma.201200574

      Thumbnail image of graphical abstract

      Thinning and shaping solid films into nanomembranes offers an alternative way to fabricate nanomaterials. The thinner thickness of nanomembranes makes them fantastic to deform, shape, and architect as planar or three-dimensional structures with unique geometries and new properties. Newly developed structures and properties of nanomembranes are summarized and reviewed in this article as well as their potential applications.

    2. Carbon Nanofibers Prepared via Electrospinning (pages 2547–2566)

      Michio Inagaki, Ying Yang and Feiyu Kang

      Article first published online: 17 APR 2012 | DOI: 10.1002/adma.201104940

      Thumbnail image of graphical abstract

      The electrospinning technique is promising for the preparation of carbon nanofibers, which have intermediate diameters between carbon nanotubes and commercially available carbon fibers. Carbon precursors, pore structure control, improvement in electrical conductivity, and metal loading into carbon nanofibers via electrospinning are discussed from the viewpoint of structure and texture control of carbon.

  6. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Reviews
    7. Communications
    1. Direct Synthesis of Anatase TiO2 Nanowires with Enhanced Photocatalytic Activity (pages 2567–2571)

      Hao Bin Wu, Huey Hoon Hng and Xiong Wen (David) Lou

      Article first published online: 10 APR 2012 | DOI: 10.1002/adma.201200564

      Thumbnail image of graphical abstract

      Anatase TiO2 nanowires have been directly synthesized via a one-pot solvothermal approach. The curved nanowires with a length of ca. 300 nm and a diameter of ca. 10 nm are grown along the [101] direction and assembled into hierarchical structures. After annealing, the anatase TiO2 nanowires perfectly retain the nanostructure, and manifest excellent photocatalytic activity for the degradation of Rhodamine B.

    2. Efficient, Large Area ITO-and-PEDOT-free Organic Solar Cell Sub-modules (pages 2572–2577)

      Hui Jin, Chen Tao, Marappan Velusamy, Muhsen Aljada, Yuliang Zhang, Mike Hambsch, Paul L. Burn and Paul Meredith

      Article first published online: 10 APR 2012 | DOI: 10.1002/adma.201104896

      Thumbnail image of graphical abstract

      A transparent top anode consisting of molybdenum oxide (MoOx) and silver (Ag) is employed in an “inverted-illumination” geometry in conjunction with a thick aluminium (100 nm) bottom contact. The optimised MoOx-Ag-MoOx stack (MAMS) has an optical transmission of 80% at the wavelength of 520 nm, sheet resistance of ∼5 ohm sq−1 and yields conversion efficiencies in 5 cm × 5 cm photoactive-area “sub-modules” of 3.17% - outperforming the equivalent conventional ITO/PEDOT:PSS devices.

    3. A Self-healing Conductive Ink (pages 2578–2581)

      Susan A. Odom, Sarut Chayanupatkul, Benjamin J. Blaiszik, Ou Zhao, Aaron C. Jackson, Paul V. Braun, Nancy R. Sottos, Scott R. White and Jeffrey S. Moore

      Article first published online: 10 APR 2012 | DOI: 10.1002/adma.201200196

      Thumbnail image of graphical abstract

      Electrical conductivity of mechanically damaged silver ink circuits is automatically restored using core–shell microcapsules. Upon mechanical damage to the circuit and microcapsules, silver particles reorganize by dissolution of the polymer binder layer upon release of solvent, hexyl acetate, from microcapsule cores. Conductivity is restored within minutes of damage, and no short-circuiting is revealed during the healing of closely spaced lines.

    4. Magnetic Transport, Mixing and Release of Cargo with Tailored Nanoliter Droplets (pages 2582–2587)

      Jonathan S. Sander, Randall M. Erb, Claude Denier and André R. Studart

      Article first published online: 26 MAR 2012 | DOI: 10.1002/adma.201200263

      Thumbnail image of graphical abstract

      Tailored nanoliter single and double emulsions that can be transported, collected/chained, and purposefully fused using magnetophoretic techniques are demonstrated. We show that such emulsions can be used for mixing, release and reaction of minor amounts of encapsulated cargo with spatial and temporal control, offering promise in applications requiring on-demand cargo release and in droplet-based high-throughput analytics.

    5. High-Performance Transistors and Complementary Inverters Based on Solution-Grown Aligned Organic Single-Crystals (pages 2588–2591)

      Hanying Li, Benjamin C.-K. Tee, Gaurav Giri, Jong Won Chung, Sang Yoon Lee and Zhenan Bao

      Article first published online: 28 MAR 2012 | DOI: 10.1002/adma.201200151

      Thumbnail image of graphical abstract

      Well-aligned C60 and TIPS-pentacene single-crystals grow on a common substrate by a droplet-pinned crystallization method. Complementary inverters based on the two aligned crystals show gain values as high as 155. This work demonstrates a simple solution-processing approach to investigate high-performance complementary circuits based on organic single-crystals.

    6. High-Rate Capability Silicon Decorated Vertically Aligned Carbon Nanotubes for Li-Ion Batteries (pages 2592–2597)

      Aurélien Gohier, Barbara Laïk, Ki-Hwan Kim, Jean-Luc Maurice, Jean-Pierre Pereira-Ramos, Costel Sorin Cojocaru and Pierre Tran Van

      Article first published online: 10 APR 2012 | DOI: 10.1002/adma.201104923

      Thumbnail image of graphical abstract

      The concept of a hybrid nanostructured collector made of thin vertically aligned carbon nanotubes (CNTs) decorated with Si nanoparticles provides high power density anodes in lithium-ion batteries. An impressive rate capability is achieved due to the efficient electronic conduction of CNTs combined with well defined electroactive Si nanoparticles: capacities of 3000 mAh g−1 at 1.3C and 800 mAh g−1 at 15C are achieved.

    7. Polar Liquid Molecule Induced Transport Property Modulation at LaAlO3/SrTiO3 Heterointerface (pages 2598–2602)

      K. Au, D. F. Li, N. Y. Chan and J. Y. Dai

      Article first published online: 12 APR 2012 | DOI: 10.1002/adma.201200673

      Thumbnail image of graphical abstract

      Application of LaAlO3/SrTiO3 interfacial two-dimensional electron gas (2DEG) as a polar molecule sensor is demonstrated. The sensing mechanism is due to the formation of a metal-semiconductor Schottky junction when the center of LaAlO3 surface is covered with polar molecules such as water. These results also evidence the existence of a polarization field inside the LaAlO3 layer.

    8. Sulfur-Bridged Annulene-TCNQ Co-Crystal: A Self-Assembled ‘‘Molecular Level Heterojunction’’ with Air Stable Ambipolar Charge Transport Behavior (pages 2603–2607)

      Jing Zhang, Hua Geng, Tarunpreet Singh Virk, Yan Zhao, Jiahui Tan, Chong-an Di, Wei Xu, Kamaljit Singh, Wenping Hu, Zhigang Shuai, Yunqi Liu and Daoben Zhu

      Article first published online: 13 APR 2012 | DOI: 10.1002/adma.201200578

      Thumbnail image of graphical abstract

      An alternatively stacked donor-acceptor complex from solution is obtained. As a self-assembled “molecular level heterojunction”, this crystal displays stable ambipolar transport behaviors in ambient atmosphere. The balance hole and electron transport properties are rationalized through theoretical considerations from band structure calculation, theoretical analysis on super-exchange effects in the intermolecular electronic couplings as well as molecular reorganization energy.

    9. Enhanced Lithographic Imaging Layer Meets Semiconductor Manufacturing Specification a Decade Early (pages 2608–2613)

      Yu-Chih Tseng, Anil U. Mane, Jeffrey W. Elam and Seth B. Darling

      Article first published online: 10 APR 2012 | DOI: 10.1002/adma.201104871

      Thumbnail image of graphical abstract

      This scanning electron microscopy image (∼2 μm wide) depicts high-aspect-ratio features patterned in silicon using sequential infiltration synthesis (SIS) enhancement of photoresist. SIS penetrates the polymeric resist layer with etch-resistant alumina, thereby transforming it into a hard mask. This conversion enables the use of very thin resist layers, so pattern collapse is virtually eliminated and goals set forth for lithography in 2022 can be achieved today.

    10. Graphene/Metal Contacts: Bistable States and Novel Memory Devices (pages 2614–2619)

      Xiaomu Wang, Weiguang Xie, Jun Du, Chengliang Wang, Ni Zhao and Jian-Bin Xu

      Article first published online: 10 APR 2012 | DOI: 10.1002/adma.201104574

      Thumbnail image of graphical abstract

      Graphene field-effect transistors (GFETs) with different metal electrodes are fabricated to explore the contact characteristics. The contact resistance and the spatial potential distribution along the graphene/metal interface are investigated. The low-doped graphene/metal contact can be reversibly switched between “ohmic” and “space-charge region limited” states. The observed switching attributes are highly reproducible and stable, which provides a new avenue to produce high-performance graphene memory devices.

    11. Roll-to-Roll Compatible Sintering of Inkjet Printed Features by Photonic and Microwave Exposure: From Non-Conductive Ink to 40% Bulk Silver Conductivity in Less Than 15 Seconds (pages 2620–2625)

      Jolke Perelaer, Robert Abbel, Sebastian Wünscher, Robin Jani, Tim van Lammeren and Ulrich S. Schubert

      Article first published online: 10 APR 2012 | DOI: 10.1002/adma.201104417

      Thumbnail image of graphical abstract

      A combination of photonic and microwave flash exposure is used to sinter inkjet printed silver nanoparticles. This approach leads to conductive features on polymer substrates in short times that are compatible with roll-to-roll production. The sequential process of sintering the as-printed features revealed a final conductivity of 40% of bulk silver, in less than 15 seconds.

    12. High Mobility, Air Stable, Organic Single Crystal Transistors of an n-Type Diperylene Bisimide (pages 2626–2630)

      Aifeng Lv, Sreenivasa R. Puniredd, Jiahui Zhang, Zhibo Li, Hongfei Zhu, Wei Jiang, Huanli Dong, Yudong He, Lang Jiang, Yan Li, Wojciech Pisula, Qing Meng, Wenping Hu and Zhaohui Wang

      Article first published online: 13 APR 2012 | DOI: 10.1002/adma.201104987

      Thumbnail image of graphical abstract

      A new n-type organic semiconductor, i.e., C12-4CldiPBI, is synthesized by a simple and facile route. Single crystal ribbons of C12-4CldiPBI are grown facilely by a solvent vapor diffusion strategy. Organic field-effect transistors based on individual ribbons are fabricated by a new technique named “Au stripe mask” method. All devices exhibit excellent n-type transistor behavior with negligible hysteresis, and all devices give an electron mobility over 1.0 cm2 V−1 s−1 with the highest mobility of 4.65 cm2 V−1 s−1. Moreover, the devices exhibit excellent air stability.

    13. Metal Oxide Thin Film Phototransistor for Remote Touch Interactive Displays (pages 2631–2636)

      Seung-Eon Ahn, Ihun Song, Sanghun Jeon, Youg Woo Jeon, Young Kim, Changjung Kim, Byungki Ryu, Je-Hun Lee, Arokia Nathan, Sungsik Lee, Gyu Tae Kim and U-In Chung

      Article first published online: 13 APR 2012 | DOI: 10.1002/adma.201200293

      Thumbnail image of graphical abstract

      The photoresponse characteristics of metal-oxide (MeO) semiconductor photosensors have been studied. Compared to the amorphous-Si-based photo-TFT, the MeO photo-TFT demonstrates superior EQE and responsivity. However, due to its inherent slow recovery to the dark state after the illumination is stopped, a unique sensing scheme suitable for the high-speed array operation is used, yet maintaining a simple array architecture as a solution for large-area interactive displays.

    14. Confinement-Induced Ordering in Dewetting and Phase Separation of Polymer Blend Films (pages 2637–2641)

      Xiao-Chun Chen, Hong-Min Li, Fei Fang, Yuan-Wei Wu, Mu Wang, Guo-Bin Ma, Yu-Qiang Ma, Da-Jun Shu and Ru-Wen Peng

      Article first published online: 12 APR 2012 | DOI: 10.1002/adma.201200089

      Thumbnail image of graphical abstract

      An ordered array of droplets is self-organized and each droplet possesses a PS kernel surrounded by a PMMA rim. The formation of a regular pattern depends on the initial thickness of the polymer film and the interstitial separation of the excavated holes on the substrate; a scaling relation has been observed. This effect suggests that a low-cost and convenient approach to generate regular polymer structures over a large area can be achieved.

    15. Icephobic/Anti-Icing Properties of Micro/Nanostructured Surfaces (pages 2642–2648)

      Peng Guo, Yongmei Zheng, Mengxi Wen, Cheng Song, Yucai Lin and Lei Jiang

      Article first published online: 10 APR 2012 | DOI: 10.1002/adma.201104412

      Thumbnail image of graphical abstract

      A micro/nanostructured (MN) surface induces a robust icephobic/anti-icing property, more than that of a nanostructured surface, and far more than that of a microstructured or smooth surface. A long delay time of more than 7000 s maintains the icephobicity/anti-icing on the MN-surface at a temperature of –10 °C.

SEARCH

SEARCH BY CITATION