Abstract
Hydrothermal technique which is a scalable, cost effective, and easy method was used to synthesize graphene/carbon nano-tubes composites. The structural characterizations of the fabricated composites were inspected using X-ray diffraction (XRD), Raman spectroscopy, transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The characteristic features of graphene nano sheets such as folds around the edges, wrinkles, and crumples were observed in SEM micrographs. Moreover, well distributed CNTs were anchored on graphene sheets. The effect of varying the concentration of CNTs on the synthesized G/CNTs was depicted. The concentrations of the embedded CNTs on graphene sheets were 2, 5, 10, and 15 wt%. Interestingly, a noticeable strong deformation in the surface of CNTs was detected which might be attributed to the relatively long time of hydrothermal treatment. Seebeck coefficient was measured for the prepared nano-composite and it can be significant in heat management.