Table 1.

A brief overview of the main advantages and disadvantages related to composite production using carbonaceous fillers.

Filler	Advantages	Disadvantages
CNTs	Increment of mechanical properties with low filler loading Low percolation threshold	High cost Complex production and purification Poor dispersibility into polymers
Graphene	Increment of mechanical properties with low filler loading Low percolation threshold Production of transparent composites	Very high cost Complex production and purification Poor dispersibility into polymers
Graphene oxide	Increment of mechanical properties with low filler loading Production of transparent composites	High cost Poor electrical properties
Carbon fibers	Superior mechanical and electrical performance Resistance to harsh environment	Very high price Complex production Delamination phenomena Difficult to dispose
Carbon black	Very cheap Great annual-based production Tunable properties of related composites Highly compatibility with several polymers	Oil derived
Biochar	Cheap Tunable properties of related composites Biomass and waste derived Highly compatibility with several polymers	Poor annual-based production Poorly standardized production