Fabrication and Characterization of Carbon Nanotube/Graphene Hybrid Foam

摘要

We developed a simple and scalable method to fabricate carbon nanotube (CNT) and graphene hybrid foams. We use polymethylmethacrylate (PMMA) microspheres as template and polyacrylonitrile (PAN) as precursor to create crosslinks among CNTs and nanoscale graphene flakes around CNTs. The porosity and the pore size of the CNT foam can be turned by adjusting the concentration and particle size of PMMA spheres. The assembled CNT foams have a hierarchically porous structure and the pore size ranges from tens of nanometers to micrometers. The effect of PAN on crosslinking CNTs and creating graphene flakes was evaluated by using ultrathin freestanding CNT sheets. The observations of electron microscope and other measurements demonstrated that our approaches are effective.