Covalent functionalization of chemically converted graphene sheets via silane and its reinforcement

Polydisperse, functionalized, chemically converted graphene (f-CCG) nanosheets, which can be homogeneously distributed into water, ethanol, DMF, DMSO and 3-aminopropyltriethoxysilane (APTS), were obtained via facile covalent functionalization with APTS. The resulting f-CCG nanosheets were characterized by FTIR, XPS, TGA, EDX, AFM, SEM, and TEM. Furthermore, the f-CCG nanosheets as reinforcing components were extended into silica monoliths. Compressive tests revealed that the compressive failure strength and the toughness of f-CCG-reinforced APTS monoliths at 0.1 wt% functionalized, chemically converted graphene sheets compared with the neat APTS monolith were greatly improved by 19.9% and 92%, respectively.

[1]  M. Dresselhaus,et al.  Intercalation compounds of graphite , 1981 .

[2]  L. Hench,et al.  The sol-gel process , 1990 .

[3]  R. Waltman,et al.  X-ray photoelectron spectroscopic studies on organic photoconductors: evaluation of atomic charges on chlorodiane blue and p-(diethylamino)benzaldehyde diphenylhydrazone , 1993 .

[4]  N. Kotov,et al.  Ultrathin graphite oxide–polyelectrolyte composites prepared by self‐assembly: Transition between conductive and non‐conductive states , 1996 .

[5]  U. Schubert,et al.  Aerogels-Airy Materials: Chemistry, Structure, and Properties. , 1998, Angewandte Chemie.

[6]  P. J. Ollivier,et al.  Layer-by-Layer Assembly of Ultrathin Composite Films from Micron-Sized Graphite Oxide Sheets and Polycations , 1999 .

[7]  R. Ruoff,et al.  Strength and breaking mechanism of multiwalled carbon nanotubes under tensile load , 2000, Science.

[8]  Iqbal Gill,et al.  Bio-doped Nanocomposite Polymers: Sol-Gel Bioencapsulates , 2001 .

[9]  Alain Walcarius,et al.  Electrochemical Applications of Silica-Based Organic−Inorganic Hybrid Materials , 2001 .

[10]  Jiang Zhu,et al.  Improving the Dispersion and Integration of Single-Walled Carbon Nanotubes in Epoxy Composites through Functionalization , 2003 .

[11]  D. Zhao,et al.  A Fast Way for Preparing Crack-free Mesostructured Silica Monolith , 2003 .

[12]  V. Castaño,et al.  Improvement of Thermal and Mechanical Properties of Carbon Nanotube Composites through Chemical Functionalization , 2003 .

[13]  Guohua Chen,et al.  Exfoliation of graphite flake and its nanocomposites , 2003 .

[14]  Wengui Weng,et al.  Preparation of polystyrene/graphite nanosheet composite , 2003 .

[15]  Guohua Chen,et al.  Preparation and characterization of graphite nanosheets from ultrasonic powdering technique , 2004 .

[16]  Werner J. Blau,et al.  High Performance Nanotube‐Reinforced Plastics: Understanding the Mechanism of Strength Increase , 2004 .

[17]  Richard A. Vaia,et al.  Nanocomposites: issues at the interface , 2004 .

[18]  Ji Liang,et al.  Carbon‐Nanotube‐Reinforced Polymer‐Derived Ceramic Composites , 2004 .

[19]  Masahiro Fujiwara,et al.  Thin-film particles of graphite oxide 1:: High-yield synthesis and flexibility of the particles , 2004 .

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

[21]  Karen Lozano,et al.  Reinforcing Epoxy Polymer Composites Through Covalent Integration of Functionalized Nanotubes , 2004 .

[22]  A. Geim,et al.  Two-dimensional gas of massless Dirac fermions in graphene , 2005, Nature.

[23]  Jae Ryoun Youn,et al.  Influence of dispersion states of carbon nanotubes on physical properties of epoxy nanocomposites , 2005 .

[24]  J. M. Kikkawa,et al.  Very Low Conductivity Threshold in Bulk Isotropic Single‐Walled Carbon Nanotube–Epoxy Composites , 2005 .

[25]  S I Cha,et al.  Extraordinary Strengthening Effect of Carbon Nanotubes in Metal‐Matrix Nanocomposites Processed by Molecular‐Level Mixing , 2005, Advanced materials.

[26]  S. Stankovich,et al.  Graphene-based composite materials , 2006, Nature.

[27]  S. Stankovich,et al.  Synthesis and exfoliation of isocyanate-treated graphene oxide nanoplatelets , 2006 .

[28]  Dongxue Han,et al.  Reinforcement of silica with single-walled carbon nanotubes through covalent functionalization , 2006 .

[29]  N. Kotov.  Materials science: Carbon sheet solutions , 2006, Nature.

[30]  S. Stankovich,et al.  Stable aqueous dispersions of graphitic nanoplatelets via the reduction of exfoliated graphite oxide in the presence of poly(sodium 4-styrenesulfonate) , 2006 .

[31]  Imre Dékány,et al.  Evolution of surface functional groups in a series of progressively oxidized graphite oxides , 2006 .

[32]  Andre K. Geim,et al.  Raman spectrum of graphene and graphene layers. , 2006, Physical review letters.

[33]  S. Stankovich,et al.  Synthesis of graphene-based nanosheets via chemical reduction of exfoliated graphite oxide , 2007 .

[34]  R. Car,et al.  Single Sheet Functionalized Graphene by Oxidation and Thermal Expansion of Graphite , 2007 .

[35]  S. Stankovich,et al.  Graphene-silica composite thin films as transparent conductors. , 2007, Nano letters.

[36]  Roland G. S. Goh,et al.  Band‐like Transport in Surface‐Functionalized Highly Solution‐Processable Graphene Nanosheets , 2008 .

[37]  Bei Wang,et al.  FACILE SYNTHESIS AND CHARACTERIZATION OF GRAPHENE NANOSHEETS , 2008 .

[38]  Chun Li,et al.  Flexible graphene films via the filtration of water-soluble noncovalent functionalized graphene sheets. , 2008, Journal of the American Chemical Society.

[39]  Chao Zhang,et al.  One‐Step Ionic‐Liquid‐Assisted Electrochemical Synthesis of Ionic‐Liquid‐Functionalized Graphene Sheets Directly from Graphite , 2008 .

[40]  G. Wallace,et al.  Processable aqueous dispersions of graphene nanosheets. , 2008, Nature nanotechnology.

[41]  James M Tour,et al.  Diazonium functionalization of surfactant-wrapped chemically converted graphene sheets. , 2008, Journal of the American Chemical Society.