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Materials for electronics that function as electrical and/or thermal conductors are often rigid, expensive, difficult to source, and sometimes toxic. An electrically and thermally conductive nanocomposite that is lightweight, flexible, and ecofriendly could improve the environmental friendliness of the electronics sector and enable new applications. Considering this, flexible and electrically and thermally conductive materials are fabricated by functionalizing paper with nanocarbon conductive inks. Carnauba wax is emulsified in isopropyl alcohol and mixed with graphene nanoplatelets (GNPs) or with hybrids of GNPs and carbon nanofibers (CNFs). The percolation threshold of the hybrid samples is lowered compared with the pure GNP composites, due to their increased filler aspect ratio. The hybrid samples also exhibit superior bending and folding stability. Densification of the coating to decrease their sheet resistance enables them to achieve as low as ≈50 Ω sq −1  for the GNP‐based paper. The densification procedure improves the bending stability, the abrasion resistance, and the electromagnetic interference shielding of the paper‐based conductors. Finally, the compressed samples show an impressive enhancement of their thermal diffusivity. The flexible and multifunctional nanocarbon coated paper is a promising electrical conductor and thermally dissipative material and, at the same time, can increase the environmental sustainability of the electronics sector.

Hybrid Graphene/Carbon Nanofiber Wax Emulsion for Paper‐Based Electronics and Thermal Management