Highly anisotropic thermal conductivity and electrical insulation of nanofibrillated cellulose/Al2O3@rGO composite films: effect of the particle size

Meng Ma; Qindan Chu; Hao Lin; Lin Xu; Huiwen He; Yanqin Shi; Si Chen; Xu Wang

doi:10.1088/1361-6528/ac44e7

Highly anisotropic thermal conductivity and electrical insulation of nanofibrillated cellulose/Al₂O₃@rGO composite films: effect of the particle size

Nanotechnology. 2022 Jan 7;33(13). doi: 10.1088/1361-6528/ac44e7.

Authors

Meng Ma¹, Qindan Chu¹, Hao Lin¹, Lin Xu¹, Huiwen He¹, Yanqin Shi¹, Si Chen¹, Xu Wang¹

Affiliation

¹ College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, People's Republic of China.

PMID: 34929686
DOI: 10.1088/1361-6528/ac44e7

Abstract

Nanofibrillated cellulose (NFC) film has received tremendous attention due to its excellent electrical insulation, which shows great application prospects in the field of electronic devices. However, the low efficient heat dissipation of NFC film largely limits its use in advanced applications. In this work, the reduced graphene oxide hybrid fillers loaded alumina (Al₂O₃) particles with different sizes were synthesized by different drying methods, and then they were mixed with NFC to prepare a series of NFC-based composite films. The effect of Al₂O₃particle sizes on the thermal conductivity of NFC-based composite films was studied. The results showed that the surface areas of l-Al₂O₃particles were smaller than that of s-Al₂O₃particles, resulting in the smaller interface thermal resistance and superior thermal conductivity of the film containing l-Al₂O₃particles. The NFC-based composite films showed great potential for applications in thermal management by adjusting the particle size of fillers.

Keywords: composite films; electrical insulation; heat dissipation; hybrid filler; nanofibrillated cellulose; particle size.