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Cover image for Vol. 10 Issue 11

Special Issue: Graphene Research in China

June 12, 2014

Volume 10, Issue 11

Pages 2113–2306

  1. Cover Picture

    1. Top of page
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    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Editorial
    8. Concepts
    9. Reviews
    10. Communications
    11. Full Papers
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      Graphene Hybrids: Nitrogen-Doped Graphene/Carbon Nanotube Hybrids: In Situ Formation on Bifunctional Catalysts and Their Superior Electrocatalytic Activity for Oxygen Evolution/Reduction Reaction (Small 11/2014) (page 2113)

      Gui-Li Tian, Meng-Qiang Zhao, Dingshan Yu, Xiang-Yi Kong, Jia-Qi Huang, Qiang Zhang and Fei Wei

      Version of Record online: 3 JUN 2014 | DOI: 10.1002/smll.201470063

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      The development of highly-active bifunctional catalysts at low cost for both oxygen reduction and oxygen evolution reactions are greatly required for fuel cells, metal–air batteries, and water splitting. As reported by Q. Zhang, F. Wei, and co-workers on page 2251, nitrogen-doped graphene/single-walled carbon nanotube hybrids exhibit very high activity for both the oxygen reduction reaction and oxygen evolution reaction, which opens up new avenues for energy conversion technologies based on earth-abundant, scalable, precious-metal-free catalysts.

  2. Inside Front Cover

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    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Editorial
    8. Concepts
    9. Reviews
    10. Communications
    11. Full Papers
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      Graphene Growth: Mechanisms of Graphene Growth on Metal Surfaces: Theoretical Perspectives (Small 11/2014) (page 2114)

      Ping Wu, Wenhua Zhang, Zhenyu Li and Jinglong Yang

      Version of Record online: 3 JUN 2014 | DOI: 10.1002/smll.201470064

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      Large-scale synthesis is very critical to promote research and applications of graphene. High quality samples can now be grown on various metal surfaces. In additional to experimental efforts to understand the underlying growth mechanisms, more and more atomic details about graphene growth are being revealed by multiscale theoretical/computational studies, which are expected to eventually make rational design of growth protocol possible. A Review of these developements is provided by Z. Li, J. Yang, and co-workers on page 2136.

  3. Back Cover

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      Capacitors: Self-Assembled α-Fe2O3 Mesocrystals/Graphene Nanohybrid for Enhanced Electrochemical Capacitors (Small 11/2014) (page 2308)

      Shuhua Yang, Xuefeng Song, Peng Zhang, Jing Sun and Lian Gao

      Version of Record online: 3 JUN 2014 | DOI: 10.1002/smll.201470067

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      A facile approach is demonstrated on page 2270 by X. F. Song, L. Gao, and co-workers for the fabrication of α-Fe2O3 mesocrystal/graphene nanohybrids by self-assembly of FeOOH nanorods as the primary building blocks on graphene under hydrothermal conditions, accompanied and promoted by concomitant phase transition from FeOOH to α-Fe2O3. The nanohybrids with sufficient porous structure and high electrical conductivity allow for effective ion and charge transport in the whole electrode, which shows superior electrochemical performance.

  4. Masthead

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      Masthead: (Small 11/2014)

      Version of Record online: 3 JUN 2014 | DOI: 10.1002/smll.201470066

  5. Contents

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    3. Inside Front Cover
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    5. Masthead
    6. Contents
    7. Editorial
    8. Concepts
    9. Reviews
    10. Communications
    11. Full Papers
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      Contents: (Small 11/2014) (pages 2115–2120)

      Version of Record online: 3 JUN 2014 | DOI: 10.1002/smll.201470065

  6. Editorial

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      From 2004 to 2014: A Fruitful Decade for Graphene Research in China (page 2121)

      Hongjun Gao, Zhongfan Liu and Xinliang Feng

      Version of Record online: 3 JUN 2014 | DOI: 10.1002/smll.201400915

  7. Concepts

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    11. Full Papers
    1. Graphenal Polymers for Energy Storage (pages 2122–2135)

      Xianglong Li, Qi Song, Long Hao and Linjie Zhi

      Version of Record online: 27 FEB 2014 | DOI: 10.1002/smll.201303717

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      Numerous intermediate materials lying between graphene and organic polymer are exploited towards developing high performance electrode materials for energy storage devices including lithium ion batteries and supercapacitors. This concept paper highlights all these intermediate materials, specifically comprising graphene subunits intrinsically interconnected by organic linkers or fractions, following a general concept of graphenal polymers.

  8. Reviews

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    7. Editorial
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    9. Reviews
    10. Communications
    11. Full Papers
    1. Mechanisms of Graphene Growth on Metal Surfaces: Theoretical Perspectives (pages 2136–2150)

      Ping Wu, Wenhua Zhang, Zhenyu Li and Jinglong Yang

      Version of Record online: 31 MAR 2014 | DOI: 10.1002/smll.201303680

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      Graphene growth on metal surfaces has been widely studied recently. To optimize growth conditions, it is critical to understand the growth mechanisms at the atomic scale. Progress in this direction is reviewed from a theoretical perspective. Theoretical studies using advanced simulation techniques together with experimental efforts enable a guided design of growth protocols.

    2. Environmentally Responsive Graphene Systems (pages 2151–2164)

      Jing Zhang, Long Song, Zhipan Zhang, Nan Chen and Liangti Qu

      Version of Record online: 23 DEC 2013 | DOI: 10.1002/smll.201303080

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      Living organisms have the capability of responding to environmental variations such as the change in temperature and relative humidity. Now, smart graphene systems mimicking living organisms can spontaneously respond to different environmental stimulations ranging from pH, temperature, electric current, light, moisture to gas ambient, leading to a variety of interesting devices for multi-oriented applications.

    3. Graphene and Graphene-like Layered Transition Metal Dichalcogenides in Energy Conversion and Storage (pages 2165–2181)

      Hua Wang, Hongbin Feng and Jinghong Li

      Version of Record online: 28 FEB 2014 | DOI: 10.1002/smll.201303711

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      This review summarizes recent progress of graphene and graphene-like layered transition metal dichalcogenide in energy conversion and storage application, including solar cells, electrocatalysis, supercapacitors, and lithium-ion batteries. Prospects and further developments in this exciting field are also discussed.

    4. Thermal and Thermoelectric Properties of Graphene (pages 2182–2199)

      Yong Xu, Zuanyi Li and Wenhui Duan

      Version of Record online: 7 MAR 2014 | DOI: 10.1002/smll.201303701

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      Thermal conductivity as a function of temperature for graphene-based systems. The tunable thermal conductivity over three orders of magnitude is achieved by different phonon scattering mechanisms and offers great opportunity for thermal management and themoelectric applications.

    5. Structural Diversity of Bulky Graphene Materials (pages 2200–2214)

      Lili Liu, Zhiqiang Niu, Li Zhang and Xiaodong Chen

      Version of Record online: 25 MAR 2014 | DOI: 10.1002/smll.201400144

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      This Review provides a broad and comprehensive overview of the recent developments in the assembly of graphene sheets into various macroscopic structures and their applications. The future prospects of graphene in this exciting field are also enumerated to guide inquiring minds.

    6. Construction of 2D Atomic Crystals on Transition Metal Surfaces: Graphene, Silicene, and Hafnene (pages 2215–2225)

      Yi Pan, Lizhi Zhang, Li Huang, Linfei Li, Lei Meng, Min Gao, Qing Huan, Xiao Lin, Yeliang Wang, Shixuan Du, Hans-Joachim Freund and Hong-Jun Gao

      Version of Record online: 31 MAR 2014 | DOI: 10.1002/smll.201303698

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      Transition metal (TM) substrates are ideal playing fields for the epitaxial growth of new 2D crystals. Since graphene was successfully grown on several TM substrates, other two-dimensional atomic crystals on different TM substrates started to attract much attention, for example, silicene and hafnene. This review presents the state of the art and an analysis of the potential of this field.

  9. Communications

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    11. Full Papers
    1. Amphiphilic Polymer Promoted Assembly of Macroporous Graphene/SnO2 Frameworks with Tunable Porosity for High-Performance Lithium Storage (pages 2226–2232)

      Yanshan Huang, Dongqing Wu, Jinzuan Wang, Sheng Han, Lu Lv, Fan Zhang and Xinliang Feng

      Version of Record online: 10 FEB 2014 | DOI: 10.1002/smll.201303423

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      3D macroporous graphene/SnO2 frameworks (MGTFs) are fabricated by amphiphilic polymer-promoted assembly method, which exhibit controllable macroporous structure and outstanding lithium storage performance.

    2. Direct Exfoliation of Graphite to Graphene by a Facile Chemical Approach (pages 2233–2238)

      Hongbin Feng, Yongmin Wu and Jinghong Li

      Version of Record online: 7 MAR 2014 | DOI: 10.1002/smll.201303722

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      Facile exfoliation of graphite: High-quality graphene sheets are produced directly from graphite by a facile chemical approach. The new strategy for non-oxidized chemical exfoliation of graphite is based on a pre-intercalated process with oleum and a further strong reaction with sodium in the graphite layers under grinding conditions. This method is facile, low cost, and high throughput.

    3. Graphene Oxide Architectures Prepared by Molecular Combing on Hydrophilic-Hydrophobic Micropatterns (pages 2239–2244)

      Jumiati Wu, Hai Li, Xiaoying Qi, Qiyuan He, Boxi Xu and Hua Zhang

      Version of Record online: 18 MAR 2014 | DOI: 10.1002/smll.201303637

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      A novel graphene oxide (GO) architecture is fabricated on hydrophilic-hydrophobic patterned alkanethiol self-assembled monolayers on Au by molecular combing of GO sheets. With hydrazine reduction, the reduced GO architecture-based device is demonstrated to detect NO2 gas. This simple method shows the potential to control the shape, orientation and position of GO sheets over large areas.

    4. Epitaxial Growth of Asymmetrically-Doped Bilayer Graphene for Photocurrent Generation (pages 2245–2250)

      Yu Zhou, Kai Yan, Di Wu, Shuli Zhao, Li Lin, Li Jin, Lei Liao, Huan Wang, Qiang Fu, Xinhe Bao, Hailin Peng and Zhongfan Liu

      Version of Record online: 18 MAR 2014 | DOI: 10.1002/smll.201303696

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      An asymmetrically doped bilayer graphene is grown by modulation-doped chemical vapor deposition, which consists of one intrinsic layer and one nitrogen-doped layer according to AB stacking. The asymmetrically doped bilayer crystalline profile is found to extend the identical registry as adjacent pristine bilayer region, thus forming single-crystalline bilayer graphene p–n junctions. Efficient photocurrent with responsivity as high as 0.2 mA/W is generated at the bilayer p–n junctions via a hot carrier-assisted mechanism.

  10. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Editorial
    8. Concepts
    9. Reviews
    10. Communications
    11. Full Papers
    1. Nitrogen-Doped Graphene/Carbon Nanotube Hybrids: In Situ Formation on Bifunctional Catalysts and Their Superior Electrocatalytic Activity for Oxygen Evolution/Reduction Reaction (pages 2251–2259)

      Gui-Li Tian, Meng-Qiang Zhao, Dingshan Yu, Xiang-Yi Kong, Jia-Qi Huang, Qiang Zhang and Fei Wei

      Version of Record online: 27 FEB 2014 | DOI: 10.1002/smll.201303715

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      N-doped graphene/single-walled carbon nanotube hybrids that are fabricated by in situ doping during chemical vapor deposition growth on layered double hydroxide derived bifunctional catalysts exhibit very high activity for both oxygen reduction reaction and oxygen evolution reaction. This opens up new avenues for energy conversion technologies based on earth-abundant, scalable, noble-metal-free catalysts.

    2. Solvothermal-Induced Self-Assembly of Fe2O3/GS Aerogels for High Li-Storage and Excellent Stability (pages 2260–2269)

      Ronghua Wang, Chaohe Xu, Meng Du, Jing Sun, Lian Gao, Peng Zhang, Heliang Yao and Chucheng Lin

      Version of Record online: 13 FEB 2014 | DOI: 10.1002/smll.201303371

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      Monolithic 3D metal oxide/GS aerogels are fabricated by a novel solvothermal-induced self-assembly approach using a colloid sol as the precursor. Benefitting from the integration of macroporous structures, large surface area, high electrical conductivity and good electrode homogeneity, the hybrid electrode demonstrates a superior rate capability and excellent prolonged cycling stability at high rates.

    3. Self-Assembled α-Fe2O3 Mesocrystals/Graphene Nanohybrid for Enhanced Electrochemical Capacitors (pages 2270–2279)

      Shuhua Yang, Xuefeng Song, Peng Zhang, Jing Sun and Lian Gao

      Version of Record online: 28 FEB 2014 | DOI: 10.1002/smll.201303922

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      Self-assembled α-Fe2O3 mesocrystals/graphene nanohybrids are successfully synthesized by a simple route, and their formation nanohybrid is discussed in detail. The nanohybrid exhibits enhanced capacitance of 306.9 F g−1 at 3 A g−1 and also demonstrates superior rate capability and good cycling stability.

    4. A General Route Towards Defect and Pore Engineering in Graphene (pages 2280–2284)

      Guibai Xie, Rong Yang, Peng Chen, Jing Zhang, Xuezeng Tian, Shuang Wu, Jing Zhao, Meng Cheng, Wei Yang, Duoming Wang, Congli He, Xuedong Bai, Dongxia Shi and Guangyu Zhang

      Version of Record online: 7 MAR 2014 | DOI: 10.1002/smll.201303671

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      A general route towards defect- and pore- engineering in graphene through remote plasma treatments is reported. Oxygen plasma irradiation is employed to create homogenous defects in graphene with controllable density. The created defects can be further enlarged into nanopores by hydrogen plasma anisotropic etching with well-defined pore size. The achieved smallest nanopores are ≈2 nm in size.

    5. A Flexible and High-Voltage Internal Tandem Supercapacitor Based on Graphene-Based Porous Materials with Ultrahigh Energy Density (pages 2285–2292)

      Fan Zhang, Yanhong Lu, Xi Yang, Long Zhang, Tengfei Zhang, Kai Leng, Yingpeng Wu, Yi Huang, Yanfeng Ma and Yongsheng Chen

      Version of Record online: 27 FEB 2014 | DOI: 10.1002/smll.201303240

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      A high-performance symmetric internal tandem supercapacitor based on a graphene-based porous carbon material is fabricated. This shows a double-increased working voltage of 7.0 V, but also displays an improved packaged energy density of 36.3 Wh kgcell −1 by 33% increase compared to the single supercapacitor, and is also about 7 times of that of commercial supercapacitors. A flexible internal tandem device is also fabricated with similar performance, high flexibility and electrochemical stability to show the universality for application.

    6. Boron Nitride Film as a Buffer Layer in Deposition of Dielectrics on Graphene (pages 2293–2299)

      Qi Han, Baoming Yan, Teng Gao, Jie Meng, Yanfeng Zhang, Zhongfan Liu, Xiaosong Wu and Dapeng Yu

      Version of Record online: 5 MAR 2014 | DOI: 10.1002/smll.201303697

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      The effect of the dielectric deposition on graphene can be reduced by using a multilayer hexagonal boron nitride film as a buffer layer. Particularly, the boron nitride layer provides significant protection in magnetron sputtering deposition. It also enables growth of uniform and charge trapping free high-k dielectrics by atomic layer deposition.

    7. High Responsivity and Gate Tunable Graphene-MoS2 Hybrid Phototransistor (pages 2300–2306)

      Hua Xu, Juanxia Wu, Qingliang Feng, Nannan Mao, Chunming Wang and Jin Zhang

      Version of Record online: 24 MAR 2014 | DOI: 10.1002/smll.201303670

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      A graphene-MoS2 hybrid phototransistor with high responsivity, gate tunable and mirror-image photoresponse is constructed. Through combining the advantages of the strong light absorption of MoS2 and the high carrier mobility of graphene, the responsivity of this device can be up to 104 mA/W. The deeper understanding of the interfacial phenomena offers new attractive insights for building future ultrasensitive optoelectronic devices.

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