Abstract
Polymers are widely applied in electronic equipment due to their comprehensive performance. However, the poor thermal conductivity (TC) limits their application in thermal management. In this paper, a series of multifunctional nanofibrillated Cellulose (NFC) composite films with high TC, electrical insulation, and excellent antibacterial properties were prepared by using zinc oxide@reduced graphene oxide (ZnO@rGO) as the fillers. The results show that a thermal conduction pathway is effectively constructed in the NFC/ZnO@rGO composite films with high in-plane TC of 8.07 W·m−1·K−1, far exceeding the 1.10 W·m−1·K−1 of pure NFC film. The insulated ZnO loaded on the surface of rGO cuts off the formation of a conductive path, so that the composite films retain the original electrical insulation (ρs > 1014 Ω, ρv > 1014 Ω·m). Moreover, the composite films exhibit excellent antibacterial properties because of ZnO. Therefore, the multifunctional NFC-based composite films could be applied in various thermal management systems with different requirements.
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