Low-density nanostructured foams are often limited in applications due to their low mechanical and thermal stabilities. Here we report an approach of building the structural units of three-dimensional (3D) foams using hybrid two-dimensional (2D) atomic layers made of stacked graphene oxide layers reinforced with conformal hexagonal boron nitride (h-BN) platelets. The ultra-low density (1/400 times density of graphite) 3D porous structures are scalably synthesized using solution processing method. A layered 3D foam structure forms due to presence of h-BN and significant improvements in the mechanical properties are observed for the hybrid foam structures, over a range of temperatures, compared with pristine graphene oxide or reduced graphene oxide foams. It is found that domains of h-BN layers on the graphene oxide framework help to reinforce the 2D structural units, providing the observed improvement in mechanical integrity of the 3D foam structure.
Bibliographical noteFunding Information:
We acknowledge the funding support from U.S. Department of Defense: U.S. Air Force Office of Scientific Research for the Project MURI: ‘Synthesis and Characterization of 3-D Carbon Nanotube Solid Networks’ Award No. FA9550-12-1-0035. We also acknowledge the support by EAGER—NSF ECCS-1327093, CONACYT (213780) and INDO-US: IUSSTF/JC/22-2012/2013-14.
Copyright 2014 Elsevier B.V., All rights reserved.
All Science Journal Classification (ASJC) codes
- Biochemistry, Genetics and Molecular Biology(all)
- Physics and Astronomy(all)