In situ self-assembly of mild chemical reduction graphene for three-dimensional architectures.

Three-dimensional (3D) architectures of graphene are of interest in applications in electronics, catalysis devices, and sensors. However, it is still a challenge to fabricate macroscopic all-graphene 3D architectures under mild conditions. Here, a simple method for the preparation of 3D architectures of graphene is developed via the in situ self-assembly of graphene prepared by mild chemical reduction at 95 °C under atmospheric pressure without stirring. No chemical or physical cross-linkers or high pressures are required. The reducing agents include NaHSO(3), Na(2)S, Vitamin C, HI, and hydroquinone. Both graphene hydrogels and aerogels can be prepared by this method, and the shapes of the 3D architectures can be controlled by changing the type of reactor. The 3D architectures of graphene have low densities, high mechanical properties, thermal stability, high electrical conductivity, and high specific capacitance, which make them candidates for potential applications in supercapacitors, hydrogen storage and as supports for catalysts.

[1]  Sergei O. Kucheyev,et al.  Mechanically robust and electrically conductive carbon nanotube foams , 2009 .

[2]  J. Georgiadis,et al.  Science and technology for water purification in the coming decades , 2008, Nature.

[3]  Wei Huang,et al.  Self-Assembly of Reduced Graphene Oxide into Three-Dimensional Architecture by Divalent Ion Linkage , 2010 .

[4]  Tammy Y. Olson,et al.  Synthesis of graphene aerogel with high electrical conductivity. , 2010, Journal of the American Chemical Society.

[5]  T. Seo,et al.  A Controllable Self‐Assembly Method for Large‐Scale Synthesis of Graphene Sponges and Free‐Standing Graphene Films , 2010 .

[6]  Xun Wang,et al.  Exfoliation of graphene from graphite and their self-assembly at the oil-water interface. , 2010, Langmuir : the ACS journal of surfaces and colloids.

[7]  Jae-Young Choi,et al.  Efficient Reduction of Graphite Oxide by Sodium Borohydride and Its Effect on Electrical Conductance , 2009 .

[8]  Hua Zhang,et al.  Organic photovoltaic devices using highly flexible reduced graphene oxide films as transparent electrodes. , 2010, ACS nano.

[9]  G. Shi,et al.  Self-assembled graphene hydrogel via a one-step hydrothermal process. , 2010, ACS nano.

[10]  D. Su,et al.  Supermolecular Self-Assembly of Graphene Sheets: Formation of Tube-in-Tube Nanostructures , 2004 .

[11]  Jing Zhuang,et al.  Noble-metal-promoted three-dimensional macroassembly of single-layered graphene oxide. , 2010, Angewandte Chemie.

[12]  Zhigang Chen,et al.  Structure and morphology of microporous carbon membrane materials derived from poly(phthalazinone ether sulfone ketone) , 2006 .

[13]  Chemical self-assembly of graphene sheets , 2009, 0902.3703.

[14]  Andre K. Geim,et al.  Electric Field Effect in Atomically Thin Carbon Films , 2004, Science.

[15]  Shixin Wu,et al.  Electrochemical deposition of ZnO nanorods on transparent reduced graphene oxide electrodes for hybrid solar cells. , 2010, Small.

[16]  Hanqing Jiang,et al.  Controlled carbon-nanotube junctions self-assembled from graphene nanoribbons. , 2009, Small.

[17]  Z. Yin,et al.  All‐Carbon Electronic Devices Fabricated by Directly Grown Single‐Walled Carbon Nanotubes on Reduced Graphene Oxide Electrodes , 2010, Advanced materials.

[18]  J. Trancik,et al.  Transparent and catalytic carbon nanotube films. , 2008, Nano letters.

[19]  Sang Yup Lee,et al.  Solution chemistry of self-assembled graphene nanohybrids for high-performance flexible biosensors. , 2010, ACS nano.

[20]  M. Endo,et al.  Hydrophilicity-controlled carbon aerogels with high mesoporosity. , 2009, Journal of the American Chemical Society.

[21]  Y. Gun’ko,et al.  Improvement of Mechanical Properties of Graphene Oxide / Poly(allylamine) Composites by Chemical Crosslinking , 2010 .

[22]  Sheng-Zhen Zu,et al.  Aqueous Dispersion of Graphene Sheets Stabilized by Pluronic Copolymers: Formation of Supramolecular Hydrogel , 2009 .

[23]  Peng Chen,et al.  Centimeter-long and large-scale micropatterns of reduced graphene oxide films: fabrication and sensing applications. , 2010, ACS nano.

[24]  Chun Li,et al.  A pH-sensitive graphene oxide composite hydrogel. , 2010, Chemical communications.

[25]  D. Milkie,et al.  Carbon Nanotube Aerogels , 2007 .

[26]  SUPARNA DUTTASINHA,et al.  Graphene: Status and Prospects , 2009, Science.

[27]  Shixin Wu,et al.  Amphiphilic graphene composites. , 2010, Angewandte Chemie.

[28]  K. Hata,et al.  Shape-engineerable and highly densely packed single-walled carbon nanotubes and their application as super-capacitor electrodes , 2006, Nature materials.

[29]  D. Schiraldi,et al.  pH Tailoring Electrical and Mechanical Behavior of Polymer-Clay-Nanotube Aerogels. , 2009, Macromolecular rapid communications.

[30]  S. Kim,et al.  Highly entangled carbon nanotube scaffolds by self-organized aqueous droplets , 2009 .

[31]  Xinqiao Jia,et al.  Synthesis and Characterization of Elastin-Mimetic Hybrid Polymers with Multiblock, Alternating Molecular Architecture and Elastomeric Properties. , 2009, Macromolecules.

[32]  Qiyuan He,et al.  Graphene oxide as a carbon source for controlled growth of carbon nanowires. , 2011, Small.

[33]  Lifeng Yan,et al.  Preparation of graphene by the rapid and mild thermal reduction of graphene oxide induced by microwaves , 2010 .

[34]  Dingshan Yu,et al.  Self-Assembled Graphene/Carbon Nanotube Hybrid Films for Supercapacitors , 2010 .

[35]  Hua Zhang,et al.  Conjugated-polyelectrolyte-functionalized reduced graphene oxide with excellent solubility and stability in polar solvents. , 2010, Small.

[36]  Yi Jia,et al.  Soft, highly conductive nanotube sponges and composites with controlled compressibility. , 2010, ACS nano.

[37]  F. Béguin,et al.  Carbon materials for the electrochemical storage of energy in capacitors , 2001 .

[38]  Lifeng Yan,et al.  Chemical Reduction of Graphene Oxide to Graphene by Sulfur-Containing Compounds , 2010 .