Synthesis of ultralow density 3D graphene-CNT foams using a two-step method

Autor(es)

Vinod, Soumya ; Tiwary, Chandra Sekhar ; Machado, Leonardo D. ; Ozden, Sehmus ; Vajtai, Robert ; Galvao, Douglas S. ; Ajayan, Pulickel M.

• Tipo de documento: Artigo Científico
• Fonte: NANOSCALE; v. 8, n. 35, p. 15857-15863, SEP 21 2016.
• Citações Web of Science: 21

Resumo

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. (AU)

• Processo FAPESP: 13/08293-7 - CECC - Centro de Engenharia e Ciências Computacionais
• Beneficiário: Munir Salomao Skaf
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs