“…Carbon materials such as graphite, graphene and carbon nanotubes (CNTs) have attracted a lot of attention [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. Among them, the last one, which possesses excellent properties such as low density, high tensile strength, high elastic modulus, and high thermal conductivity (>3000 W·m −1 ·K −1 ) [ 14 , 15 , 16 ], is used in the fields of composite materials [ 17 ], solar cells [ 18 ] and optical devices [ 19 ].…”