Preparation and properties of CNTs-graphene aerogel

Homogeneous carbon nanotubes (CNTs)-graphene (GR) dispersion was used as the precursor solution, and the 3.0wt% of 1788-polyving alcohol (PVA) solution as organic binder to fabricate the lightweight, smooth and good mechanical cutting performance CNTs-GR aerogel by freeze drying technique. Microstructures and mechanical properties were characterized by TEM, SEM, compression testing machine and the specific surface area measuring instrument. Results suggest that when the mass fraction of CNTs-GR hybrid solution is 3% and the mass ratio of CNTs and GR is 5:3, hierarchical dimension of pores are presented, and the pores distribution is the most uniform in the aerogel. The contraction distortion of the sample can be prevented effectively by using the PVA as a binder. The mass of the solid object is minus a linear correlation with the density of the sample, matching the function relational expression of y=-0.125 x +106.26. And the specific surface area of aerogel is 138.77 m²/g, mesoporous account for the majority of the aerogel, the average pore diameter is 46.6 nm according to the N₂ adsorption-desorption test and the porosity can reach 97%. The samples appear three distinct stages of plastic deformation during the compressive testing and reply to the prototype at last.