Advanced Materials

Cover image for Vol. 26 Issue 26

July 9, 2014

Volume 26, Issue 26

Pages 4401–4593

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      Catalysis: Low-Temperature Remediation of NO Catalyzed by Interleaved CuO Nanoplates (Adv. Mater. 26/2014) (page 4401)

      Francis Malar Auxilia, Shinsuke Ishihara, Saikat Mandal, Toyokazu Tanabe, Govindachetty Saravanan, Gubbala V. Ramesh, Naoto Umezawa, Toru Hara, Ya Xu, Shunichi Hishita, Yusuke Yamauchi, Arivuoli Dakshanamoorthy, Jonathan P. Hill, Katsuhiko Ariga and Hideki Abe

      Version of Record online: 8 JUL 2014 | DOI: 10.1002/adma.201470173

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      On page 4481, H. Abe, K. Ariga, S. Ishihara, and co-workers demonstrate that single-crystalline {001} nanoplates of an abundantly available copper oxide, when interleaved with each other in the form of a flower-like microstructure, remediate toxic nitrogen oxides into environmentally benign nitrogen more efficiently at low temperatures than preciousmetal catalysts such as platinum, palladium, and even rival rhodium.

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      Janus Nanodiscs: Janus Nanodisc of Diblock Copolymers (Adv. Mater. 26/2014) (page 4402)

      Renhua Deng, Fuxin Liang, Peng Zhou, Chengliang Zhang, Xiaozhong Qu, Qian Wang, Jiaoli Li, Jintao Zhu and Zhenzhong Yang

      Version of Record online: 8 JUL 2014 | DOI: 10.1002/adma.201470174

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      Z. Z. Yang, J. Zhu, F. X. Liang, and co-workers develop on page 4469 a facile approach to synthesize regular and uniform polymeric Janus nanodiscs with alternative layers of block copolymers by partial disintegration of ellipsoidal nano particles. Further selective growth of materials onto the desired sides of the discs extends the composition and tunes the microstructure for achieving functional nanodiscs. Many other Janus nanomaterials with tunable shapes are expected using similar methods.

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      Memristive Systems: Isothermal Switching and Detailed Filament Evolution in Memristive Systems (Adv. Mater. 26/2014) (page 4595)

      Patrick R. Mickel, Andrew J. Lohn, Conrad D. James and Matthew J Marinella

      Version of Record online: 8 JUL 2014 | DOI: 10.1002/adma.201470179

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      The steady-state solution of filamentary memristive switching is derived directly from the heat equation, modelling vertical and radial heat flow, as demonstrated by P. R. Mickel, and co-workers on page 4486. This solution is shown to provide a continuous and accurate description of the evolution of the filament radius, composition, heat flow, and temperature during switching and is demonstrated to apply to a large range of switching materials and experimental time-scales.

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      Nanostructures: Mussel-Inspired Plasmonic Nanohybrids for Light Harvesting (Adv. Mater. 26/2014) (page 4596)

      Minah Lee, Jong Uk Kim, Joon Seok Lee, Byung Il Lee, Jonghwa Shin and Chan Beum Park

      Version of Record online: 8 JUL 2014 | DOI: 10.1002/adma.201470180

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      The back cover image illustrates an innovative scheme for the fabrication of elaborate plasmonic core–shell nanohybrid architectures using multi-purpose mussel-inspired polydopamine nanolayers. The design flexibility and simplicity provides an effective way to develop plasmon-enhanced solar-energy-conversion platforms. By coupling plasmonic resonators and photosensitizers on a sub-nanometer scale through a simple solution-based process, light absorption in photocatalytic systems can be greatly enhanced to boost artificial photosynthetic reactions, as shown by C. B. Park, J. Shin, and co-workers on page 4463.

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      Masthead: (Adv. Mater. 26/2014)

      Version of Record online: 8 JUL 2014 | DOI: 10.1002/adma.201470176

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      Transparent High-Performance Thin Film Transistors from Solution-Processed SnO2/ZrO2 Gel-like Precursors (page 4412)

      Jaewon Jang, Rungrot Kitsomboonloha, Sarah L. Swisher, Eung Seok Park, Hongki Kang and Vivek Subramanian

      Version of Record online: 8 JUL 2014 | DOI: 10.1002/adma.201402185

      This article corrects:
  8. Progress Reports

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    1. Understanding Low Bandgap Polymer PTB7 and Optimizing Polymer Solar Cells Based on It (pages 4413–4430)

      Luyao Lu and Luping Yu

      Version of Record online: 26 MAR 2014 | DOI: 10.1002/adma.201400384

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      Recent developments in PTB7 polymer solar cells are highlighted in this Progress Report. The basic properties of PTB family polymers are examined, with deeper insight into the structure-property relationship for PTB7 and other closely related polymers. A phenomenological correlation between the intramolecular dipole moment change and charge separation is discussed. Device innovations, from interfacial engineering to the plasmonic effect and incorporation of carbon nanostructures for PTB7 are provided.

  9. Communications

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    1. Silk Protein Lithography as a Route to Fabricate Sericin Microarchitectures (pages 4431–4437)

      Nicholas E. Kurland, Tuli Dey, Congzhou Wang, Subhas C. Kundu and Vamsi K. Yadavalli

      Version of Record online: 16 APR 2014 | DOI: 10.1002/adma.201400777

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      Photolithographic fabrication via a “silk sericin photoresist” is used to form precise protein microstructures directly and rapidly on a variety of substrates. High-resolution and fidelity architectures in two and three dimensions with line widths down to 1 μm are formed. Photo-crosslinked protein structures provide structural iridescence and guide cell adhesion with precise spatial control.

    2. Single-Layered Graphitic-C3N4 Quantum Dots for Two-Photon Fluorescence Imaging of Cellular Nucleus (pages 4438–4443)

      Xiaodong Zhang, Hongxia Wang, Hui Wang, Qiong Zhang, Junfeng Xie, Yupeng Tian, Jun Wang and Yi Xie

      Version of Record online: 8 MAY 2014 | DOI: 10.1002/adma.201400111

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      A promising, safe, and economic fluorescent probe, g-C3N4 single-layered QDs, is introduced for two-photon fluorescence imaging of the cellular nucleus for the first time. The large two-photon absorption cross section, the high photostability, good biocompatibility and non-toxicity, negligible photothermal effect, and specific interaction with DNA render the single-layered g-C3 N4 QDs as a promising candidate for in vivo and in vitro two-photon fluorescence imaging and further biomedical applications.

    3. Smart, Stretchable Supercapacitors (pages 4444–4449)

      Xuli Chen, Huijuan Lin, Peining Chen, Guozhen Guan, Jue Deng and Huisheng Peng

      Version of Record online: 2 MAY 2014 | DOI: 10.1002/adma.201400842

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      Smart supercapacitors are developed by depositing conducting polymers onto aligned carbon-nanotube sheets. These supercapacitors rapidly and reversibly demonstrate color changes in response to a variation in the level of stored energy and the chromatic transitions can be directly observed by the naked eye.

    4. Fundamental Limitations for Electroluminescence in Organic Dual-Gate Field-Effect Transistors (pages 4450–4455)

      W. S. Christian Roelofs, Mark-Jan Spijkman, Simon G. J. Mathijssen, René A. J. Janssen, Dago M. de Leeuw and Martijn Kemerink

      Version of Record online: 25 MAR 2014 | DOI: 10.1002/adma.201305215

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      A dual-gate organic field-effect transistor is investigated for electrically pumped lasing. The two gates can independently accumulate electrons and holes, yielding current densities exceeding the lasing threshold. Here, the aim is to force the electrons and holes to recombine by confining the charges in a single semiconducting film. It is found that independent hole and electron accumulation is mutually exclusive with vertical recombination and light emission.

    5. Controlling Molecular Weight of a High Efficiency Donor-Acceptor Conjugated Polymer and Understanding Its Significant Impact on Photovoltaic Properties (pages 4456–4462)

      Wentao Li, Liqiang Yang, John R. Tumbleston, Liang Yan, Harald Ade and Wei You

      Version of Record online: 14 MAR 2014 | DOI: 10.1002/adma.201305251

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      The molecular weight (MW) of PBnDT-FTAZ can be precisely controlled by adjusting the stoichiometric ratio of the two monomers, following the Carothers equation. The study of a set of PBnDT-FTAZ polymers with different MWs reveals that the MW significantly influences the morphology and structural order of PBnDTFTAZ in its bulk heterojunction solar cells, with the highest efficiency (over 7%) achieved with the use of a MW of 40 000 g mol−1.

    6. Mussel-Inspired Plasmonic Nanohybrids for Light Harvesting (pages 4463–4468)

      Minah Lee, Jong Uk Kim, Joon Seok Lee, Byung Il Lee, Jonghwa Shin and Chan Beum Park

      Version of Record online: 13 MAR 2014 | DOI: 10.1002/adma.201305766

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      Core–shell plasmonic nanohybrids are synthesized through a simple solutionbased process utilizing mussel-inspired polydopamine (PDA). The multi-purpose PDA not only facilitates plasmonic metal formation, but also serves as a scaffold to incorporate photosensitizers around the metal cores, as well as an adhesive between the nanohybrids and the substrate. The resulting plasmonic assembly exhibits highly enhanced light absorption in photo catalytic systems to augment artificial photosynthesis.

    7. Janus Nanodisc of Diblock Copolymers (pages 4469–4472)

      Renhua Deng, Fuxin Liang, Peng Zhou, Chengliang Zhang, Xiaozhong Qu, Qian Wang, Jiaoli Li, Jintao Zhu and Zhenzhong Yang

      Version of Record online: 14 MAR 2014 | DOI: 10.1002/adma.201305849

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      Janus nanodiscs of diblock copolymers are prepared by stepwise disassembly of PS-b-P4VP disc-stacked particles. The Janus nanodiscs are uniform in thickness and regular in contour. By preferential growth of functional materials at the positively charged P4VP side, the composition, microstructure, and performance of the Janus nanodiscs are tunable.

  10. Frontispiece

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      Polymer-Based Sensors: Polymer-Waveguide-Based Flexible Tactile Sensor Array for Dynamic Response (Adv. Mater. 26/2014) (page 4473)

      Sungryul Yun, Suntak Park, Bongje Park, Youngsung Kim, Seung Koo Park, Saekwang Nam and Ki-Uk Kyung

      Version of Record online: 8 JUL 2014 | DOI: 10.1002/adma.201470177

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      A transparent and flexible force sensor film based on polymer-waveguide is proposed as described by K. U. Kyung and co-workers on page 4474. Microscale transparent structures enable the sensor to work on curvilinear surfaces such as human skin or flexible displays

  11. Communications

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    1. Polymer-Waveguide-Based Flexible Tactile Sensor Array for Dynamic Response (pages 4474–4480)

      Sungryul Yun, Suntak Park, Bongje Park, Youngsung Kim, Seung Koo Park, Saekwang Nam and Ki-Uk Kyung

      Version of Record online: 7 APR 2014 | DOI: 10.1002/adma.201305850

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      A polymer-waveguide-based transparent and flexible force sensor array is proposed, which satisfies the principal requirements for a tactile sensor working on curvilinear surfaces, such as thinfilm architecture (thickness < 150 μm), localized force sensing (ca. 0–3 N), multiple-point re cognition (27 points), bending robustness (10.8% degradation at R = 1.5 mm), and fast response (bandwidth > 16 Hz).

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      Low-Temperature Remediation of NO Catalyzed by Interleaved CuO Nanoplates (pages 4481–4485)

      Francis Malar Auxilia, Shinsuke Ishihara, Saikat Mandal, Toyokazu Tanabe, Govindachetty Saravanan, Gubbala V. Ramesh, Naoto Umezawa, Toru Hara, Ya Xu, Shunichi Hishita, Yusuke Yamauchi, Arivuoli Dakshanamoorthy, Jonathan P. Hill, Katsuhiko Ariga and Hideki Abe

      Version of Record online: 30 APR 2014 | DOI: 10.1002/adma.201306055

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      A copper(II)-oxide-based exhaust catalyst exhibits better activity than Pt- and Rh-nanoparticle catalysts in NO remediation at 175 °C. Following theoretical design, the CuO catalyst is rationally prepared; CuO nanoplates bearing a maximized amount of the active {001} facet are arranged in interleaved layers. A field test using a commercial gasoline engine demonstrates the ability of the catalyst to remove NO from the exhaust of small vehicles.

    3. Isothermal Switching and Detailed Filament Evolution in Memristive Systems (pages 4486–4490)

      Patrick R. Mickel, Andrew J. Lohn, Conrad D. James and Matthew J Marinella

      Version of Record online: 29 APR 2014 | DOI: 10.1002/adma.201306182

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      The steady-state solution of filamentary memristive switching may be derived directly from the heat equation, modelling vertical and radial heat flow. This solution is shown to provide a continuous and accurate description of the evolution of the filament radius, composition, heat flow, and temperature during switching, and is shown to apply to a large range of switching materials and experimental time-scales.

    4. Development of Intrinsically Photoluminescent and Photostable Polylactones (pages 4491–4496)

      Zhiwei Xie, Yi Zhang, Li Liu, Hong Weng, Ralph P. Mason, Liping Tang, Kytai T. Nguyen, Jer-Tsong Hsieh and Jian Yang

      Version of Record online: 26 MAR 2014 | DOI: 10.1002/adma.201306070

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      A method of introducing intrinsically photo luminescent properties to biodegradable polymer is introduced, exemplified by the synthesis of intrinsically photoluminescent polylactones that enable non-invasive monitoring and tracking of material degradation in vivo in realtime, as well as the formation of theranostic nanoparticles for cancer imaging and drug delivery.

    5. Fabrication of a Multifunctional Nano-in-micro Drug Delivery Platform by Microfluidic Templated Encapsulation of Porous Silicon in Polymer Matrix (pages 4497–4503)

      Hongbo Zhang, Dongfei Liu, Mohammad-Ali Shahbazi, Ermei Mäkilä, Bárbara Herranz-Blanco, Jarno Salonen, Jouni Hirvonen and Hélder A. Santos

      Version of Record online: 16 APR 2014 | DOI: 10.1002/adma.201400953

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      A multifunctional nano-in-micro drug delivery platform is developed by conjugating the porous silicon nanoparticles with mucoadhesive polymers and subsequent encapsulation into a pH-responsive polymer using microfluidics. The multistage platform shows monodisperse size distribution and pH-responsive payload release, and the released nanoparticles are mucoadhesive. Moreover, this platform is capable of simultaneously loading and releasing multidrugs with distinct properties.

    6. Revelation of Intertwining Organic and Inorganic Fractal Structures in Polymer Coatings (pages 4504–4508)

      A. E. Hughes, A. Trinchi, F. F. Chen, Y. S. Yang, I. S. Cole, S. Sellaiyan, J. Carr, P. D. Lee, G. E. Thompson and T. Q. Xiao

      Version of Record online: 2 MAY 2014 | DOI: 10.1002/adma.201400561

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      X-ray microtomography and serial block face scanning electron microscopy are used to reveal independent clusters of inorganic particles embedded within a polymer. These clusters are interpenetrating, of varying size, and have fractal dimensions that strongly influence transport and structure–property relations. This interpretation forms a baseline for designing hybrid materials for applications in self-healing, drug delivery, and membranes.

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      Nanoplasmonics: A Deformable Nanoplasmonic Membrane Reveals Universal Correlations Between Plasmon Resonance and Surface Enhanced Raman Scattering (Adv. Mater. 26/2014) (page 4509)

      Minhee Kang, Jae-Jun Kim, Young-Jae Oh, Sang-Gil Park and Ki-Hun Jeong

      Version of Record online: 8 JUL 2014 | DOI: 10.1002/adma.201470178

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      On page 4510, the pioneering work by K.-H. Jeong and co-workers experimentally reveals a universal and quantitative correlation between plasmon resonance and surface-enhanced Raman scattering (SERS) signals by using a novel active plasmonic device with a large tuning span and precise tuning resolution, termed a deformable nanoplasmonic membrane. The image shows the variation in SERS gain under precise tuning of the plasmon resonance by 1 nm over the Raman Stokes shift range.

  13. Communications

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    1. A Deformable Nanoplasmonic Membrane Reveals Universal Correlations Between Plasmon Resonance and Surface Enhanced Raman Scattering (pages 4510–4514)

      Minhee Kang, Jae-Jun Kim, Young-Jae Oh, Sang-Gil Park and Ki-Hun Jeong

      Version of Record online: 26 MAR 2014 | DOI: 10.1002/adma.201305950

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      A quantitative correlation between plasmon resonance and surface enhanced Raman scattering (SERS) signals is revealed by using a novel active plasmonic method, that is, a deformable nanoplasmonic membrane. A single SERS peak has the maximum gain at the corresponding plasmon resonance wavelength, which has the maximum extinction product of an excitation and the corresponding Raman scattering wavelengths.

    2. Switchable Dielectric, Piezoelectric, and Second-Harmonic Generation Bistability in a New Improper Ferroelectric above Room Temperature (pages 4515–4520)

      Yi Zhang, Heng-Yun Ye, Hong-Ling Cai, Da-Wei Fu, Qiong Ye, Wen Zhang, Qionghua Zhou, Jinlan Wang, Guo-Liang Yuan and Ren-Gen Xiong

      Version of Record online: 2 MAY 2014 | DOI: 10.1002/adma.201400806

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      Imidazolium periodate (IPI) is found to be an improper ferroelectric. It shows bistable properties simultaneously in three channels of dielectricity, piezoelectricity, and second-harmonic generation within the temperature window 300–310 K.

    3. Large-Area Freestanding Graphene Paper for Superior Thermal Management (pages 4521–4526)

      Guoqing Xin, Hongtao Sun, Tao Hu, Hafez Raeisi Fard, Xiang Sun, Nikhil Koratkar, Theodorian Borca-Tasciuc and Jie Lian

      Version of Record online: 11 MAY 2014 | DOI: 10.1002/adma.201400951

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      Large-area freestanding graphene papers (GPs) are fabricated by electrospray deposition integrated with a continuous roll-to-roll process. Upon mechanical compaction and thermal annealing, GPs can achieve a thermal conductivity of as high as 1238.3–1434 W m−1 K−1. The super-thermally conductive GPs display an outstanding heat-spread ability and are more efficient in removing hot spots than Cu and Al foils.

    4. Hierarchically Designed SiOx/SiOy Bilayer Nanomembranes as Stable Anodes for Lithium Ion Batteries (pages 4527–4532)

      Lin Zhang, Junwen Deng, Lifeng Liu, Wenping Si, Steffen Oswald, Lixia Xi, Manab Kundu, Guozhi Ma, Thomas Gemming, Stefan Baunack, Fei Ding, Chenglin Yan and Oliver G. Schmidt

      Version of Record online: 2 MAY 2014 | DOI: 10.1002/adma.201401194

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      Hierarchically designed SiOx/SiOy rolled-up bilayer nanomembranes are used as anodes for lithium-ion batteries. The functionalities of the SiO(x,y) layers can be engineered by simply controlling the oxygen content, resulting in anodes that exhibit a reversible capacity of about 1300 mA h g−1 with an excellent stability of over 100 cycles, as well as a good rate capability.

    5. Gravure Printing of Graphene for Large-area Flexible Electronics (pages 4533–4538)

      Ethan B. Secor, Sooman Lim, Heng Zhang, C. Daniel Frisbie, Lorraine F. Francis and Mark C. Hersam

      Version of Record online: 29 APR 2014 | DOI: 10.1002/adma.201401052

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      Gravure printing of graphene is demonstrated for the rapid production of conductive patterns on flexible substrates. Development of suitable inks and printing parameters enables the fabrication of patterns with a resolution down to 30 μm. A mild annealing step yields conductive lines with high reliability and uniformity, providing an efficient method for the integration of graphene into large-area printed and flexible electronics.

    6. Spatially Mapping Charge Carrier Density and Defects in Organic Electronics Using Modulation-Amplified Reflectance Spectroscopy (pages 4539–4545)

      Andrew R. Davis, Lorelle N. Pye, Noam Katz, Janice A. Hudgings and Kenneth R. Carter

      Version of Record online: 30 MAY 2014 | DOI: 10.1002/adma.201400859

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      Charge-modulated optical spectroscopy is used to achieve dynamic two-dimensional mapping of the charge-carrier distribution in poly(3-hexylthiophene) thin-film transistors. The resulting in-channel distributions evolve from uniformly symmetric to asymmetrically saturated as the devices are increasingly biased. Furthermore, physical, chemical, and electrical defects are spatially resolved in cases where their presence is not obvious from the device performance.

    7. High-Performance Solution-Processable N-Shaped Organic Semiconducting Materials with Stabilized Crystal Phase (pages 4546–4551)

      Chikahiko Mitsui, Toshihiro Okamoto, Masakazu Yamagishi, Junto Tsurumi, Kazumi Yoshimoto, Katsumasa Nakahara, Junshi Soeda, Yuri Hirose, Hiroyasu Sato, Akihito Yamano, Takafumi Uemura and Jun Takeya

      Version of Record online: 8 MAY 2014 | DOI: 10.1002/adma.201400289

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      N-shaped organic semiconductors are synthesized via four steps from a readily available starting material. Such semiconductors exhibit preferable ionization potential for p-type operation, thermally stable crystalline phase over 200 °C, and high carrier mobility up to 16 cm2 V–1 s–1 (12.1 cm2 V–1 s–1 on average) with small threshold voltages in solution-crystallized field-effect transistors.

    8. Layer-by-Layer Assembled Heteroatom-Doped Graphene Films with Ultrahigh Volumetric Capacitance and Rate Capability for Micro-Supercapacitors (pages 4552–4558)

      Zhong-Shuai Wu, Khaled Parvez, Andreas Winter, Henning Vieker, Xianjie Liu, Sheng Han, Andrey Turchanin, Xinliang Feng and Klaus Müllen

      Version of Record online: 29 APR 2014 | DOI: 10.1002/adma.201401228

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      Highly uniform, ultrathin, layer-by-layer heteroatom (N, B) co-doped graphene films are fabricated for high-performance on-chip planar micro-supercapacitors with an ultrahigh volumetric capacitance of ∼488 F cm−3 and excellent rate capability due to the synergistic effect of nitrogen and boron co-doping.

    9. Nanoparticles of Conjugated Polymers Prepared from Phase-Separated Films of Phospholipids and Polymers for Biomedical Applications (pages 4559–4564)

      Jungju Yoon, Jungheon Kwag, Tae Joo Shin, Joonhyuck Park, Yong Man Lee, Yebin Lee, Jonghyup Park, Jung Heo, Chulmin Joo, Tae Jung Park, Pil J. Yoo, Sungjee Kim and Juhyun Park

      Version of Record online: 2 MAY 2014 | DOI: 10.1002/adma.201400906

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      Phase separation in films of phospholipids and conjugated polymers results in nanoassemblies because of a difference in the physicochemical properties between the hydrophobic polymers and the polar lipid heads, together with the comparable polymer side-chain lengths to lipid tail lengths, thus producing nanoparticles of conjugated polymers upon disassembly in aqueous media by the penetration of water into polar regions of the lipid heads.

    10. Ultrasmall Au10−12(SG)10−12 Nanomolecules for High Tumor Specificity and Cancer Radiotherapy (pages 4565–4568)

      Xiao-Dong Zhang, Zhentao Luo, Jie Chen, Xiu Shen, Shasha Song, Yuanming Sun, Saijun Fan, Feiyue Fan, David Tai Leong and Jianping Xie

      Version of Record online: 11 MAY 2014 | DOI: 10.1002/adma.201400866

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      Radiosensitizers can increase local treatment efficacy under a relatively low and safe radiation dose, thereby facilitating tumor eradication and minimizing side effects. Here, a new class of radiosensitizers is reported, which contain several gold (Au) atoms embedded inside a peptide shell (e.g., Au10–12 (SG)10–12) and can achieve ultrahigh tumor uptake (10.86 SUV at 24 h post injection) and targeting specificity, efficient renal clearance, and high radiotherapy enhancement.

    11. Modulating Materials by Orthogonally Oriented β-Strands: Composites of Amyloid and Silk Fibroin Fibrils (pages 4569–4574)

      Shengjie Ling, Chaoxu Li, Jozef Adamcik, Zhengzhong Shao, Xin Chen and Raffaele Mezzenga

      Version of Record online: 20 MAY 2014 | DOI: 10.1002/adma.201400730

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      Amyloid fibrils and silk fibroin (SF) fibrils are proteinaceous aggregates occurring either naturally or as artificially reconstituted fibrous systems, in which the constituent β-strands are aligned either orthogonally or parallel to the fibril main axis, conferring complementary physical properties. Here, it is shown how the combination of these two classes of protein fibrils with orthogonally oriented β-strands results in composite materials with controllable physical properties at the molecular, mesoscopic, and continuum length scales.

    12. Role of 1D Metallic Nanowires in Polydomain Graphene for Highly Transparent Conducting Films (pages 4575–4581)

      Hyung Ouk Choi, Dae Woo Kim, Seon Joon Kim, Seung Bo Yang and Hee-Tae Jung

      Version of Record online: 15 MAY 2014 | DOI: 10.1002/adma.201306234

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      Upon the addition of silver nanowires (AgNWs), the electrical conductance of graphene film is improved. According to the film's optical birefringence, as shown by studies using liquid crystals (LCs), the improvements do not result from the chemical doping properties of the AgNWs; instead, they arise because the AgNWs facilitate connections among the domains in the graphene film. This is further supported by the film's Dirac point voltage, Raman spectra, and electrical resistance.

    13. An Organic Quantum Well Based on High-Quality Crystalline Heteroepitaxy Films (pages 4582–4587)

      Zi Wang, Tong Wang, Haibo Wang and Donghang Yan

      Version of Record online: 13 MAY 2014 | DOI: 10.1002/adma.201400702

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      A meaningful organic quantum well based on crystalline heteroepitaxy films is constructed. The quantum confinement effect is demonstrated by its reflections on optics and electrics: the blueshift of the optical characteristic peaks and the negative differential resistance at room temperature. The realization of an organic quantum well indicates the highly delocalized transport mechanism in well-defined organic crystalline systems and promises novel organic “quantum” optoelectronic devices.

    14. Highly Stable Carbon Nanotube Top-Gate Transistors with Tunable Threshold Voltage (pages 4588–4593)

      Huiliang Wang, Brian Cobb, Albert van Breemen, Gerwin Gelinck and Zhenan Bao

      Version of Record online: 2 MAY 2014 | DOI: 10.1002/adma.201400540

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      Carbon-nanotube top-gate transistors with fluorinated dielectrics are presented. With PTrFE as the dielectric, the devices have absent or small hysteresis at different sweep rates and excellent bias-stress stability under ambient conditions. Ambipolar single-walled carbon nanotube (SWNT) transistors are observed when P(VDF-TrFE-CTFE) is utilized as a topgate dielectric. Furthermore, continuous tuning of the threshold voltages of both unipolar and ambipolar SWNT thin-film transistors (TFTs) is demonstrated for the first time.

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