Abstract
A highly thermally conductive heat spreader for applications in electronic devices is becoming increasingly demanding, and therefore the removal of excess heat requires an efficient heat dissipating device. Boron nitride nanosheets (BNNSs) were prepared as thermally conductive fillers using hexagonal boron nitride (h-BN) powder as raw material by a water exfoliation method. A composite film was prepared by vacuum filtration using cellulose nanofibers (CNFs) as the substrate with an in-plane thermal conductivity (TC) of 82.4 W m−1 K−1, thermal conductivity enhancement increasing by 9,486% compared to pure cellulose film. Thus, CNF/BNNS composite films are promising as effective thermal interface materials (TIMs) in electronic devices and electronic component applications.
Highlights
In recent years, with the continuous improvement of technology, high-power electronic devices and highly integrated electronic components are developed towards more precision and miniaturization
We found that the thermal conductivity of the cellulose nanofibers (CNFs)/Boron nitride nanosheets (BNNSs) composite films increased with increasing BNNS filler content
The thickness of BNNS was measured by an atomic force microscope (AFM)
Summary
With the continuous improvement of technology, high-power electronic devices and highly integrated electronic components are developed towards more precision and miniaturization. We prepared CNF/BNNS composite films by controlling the suspension concentration at 0.15% and increasing the BNNS filler content. We found that the thermal conductivity of the CNF/BNNS composite films increased with increasing BNNS filler content. When the BNNS filler concentration was 90%, the CNF/BNNS composite films had the highest thermal conductivity of 70.4 W m−1 K−1. We have investigated the in-plane thermal conductivity of the CNF/BNNS composite films in these two ways, the effect of varying the suspension concentration with a 90% BNNS filler content. The prepared dispersion was further dispersed in the sonicator for another 30 min to obtain the final suspension by adding 33 ml and vacuum filtering through a polycarbonate membrane with a pore size of 0.22 μm to obtain a CNF/BNNS composite film with a thickness of about 30 μm. Infrared photos were taken by an infrared camera (Fluke, Ti400, WA, United States)
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