Artículos de revistas
Synthesis Of Ultralow Density 3d Graphene-cnt Foams Using A Two-step Method
Registro en:
Nanoscale. Royal Soc Chemistry, v. 8, p. 15857 - 15863, 2016.
2040-3364
2040-3372
WOS:000382839100004
10.1039/c6nr04252j
Autor
Vinod
Soumya; Tiwary
Chandra Sekhar; Machado
Leonardo D.; Ozden
Sehmus; Vajtai
Robert; Galvao
Douglas S.; Ajayan
Pulickel M.
Institución
Resumen
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Here, we report a highly scalable two-step method to produce graphene foams with ordered carbon nanotube reinforcements. In our approach, we first used solution assembly methods to obtain graphene oxide foam. Next, we employed chemical vapor deposition to simultaneously grow carbon nanotubes and thermally reduce the 3D graphene oxide scaffold. The resulting structure presented increased stiffness, good mechanical stability and oil absorption properties. Molecular dynamics simulations were carried out to further elucidate failure mechanisms and to understand the enhancement of the mechanical properties. The simulations showed that mechanical failure is directly associated with bending of vertical reinforcements, and that, for similar length and contact area, much more stress is required to bend the corresponding reinforcements of carbon nanotubes, thus explaining the experimentally observed enhanced mechanical properties. 8 35 15857 15863 U.S. Department of Defense: the U.S. Air Force Office of Scientific Research for the Project MURI: "Synthesis and Characterization of 3-D Carbon Nanotube Solid Networks" [etFA9550-12-1-0035] Center for Computational Engineering and Sciences at Unicamp through the FAPESP/CEPID [2013/08293-7] Brazilian Federal Agency CAPES via its PNPD program Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)