Abstract
It is urgent and significant to develop a thermal interface material (TIM) with both high thermal conductivity and excellent mechanical strength for high-performance electronic devices. For the first time, we designed and fabricated a sandwich structured TIM, constructed by a cellulose nanofiber (CNF) core layer sandwiched by reduced graphene oxide (rGO) shell, with copper ions as a crosslinker, via a facile and scalable vacuum filtration process. The continuous rGO layers on the surface of the composite provided a good thermal conductive pathway for the composite films. The thermal conductivity of the sandwiched films with 8.0 wt% rGO reached 29.5 W/mK, which is over eight times than the CNF films, and realized an ultrafast thermal diffusion time at 73 ms. The sandwich structure combined with the cross-linker of copper ions also plays a synergistic role in construct mechanical strength. Compared to the CNF, the tensile strength of the sandwiched films with 8.0 wt% rGO unprecedentedly reached 314 MPa (nearly three times of bare CNF films), and the elongation increased 63%. In addition, the films also shows high water stability and excellent flexibility, which makes it a very promising for advanced flexible or wearable electronics. This work provides a new insight in rational structure design and novel scalable fabrication strategy to develop TIM with outstanding mechanical strength and thermal conductivity.
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This work was supported by National Natural Science Foundation of China (NSFC No. 51663003), Science and Technology Foundation of Guizhou Province (Grant No. [2019] 2166).
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Shan, B., Xiong, Y., Li, Y. et al. Sandwich structured RGO/CNF/RGO composite films for superior mechanical and thermally conductive properties. Cellulose 27, 5055–5069 (2020). https://doi.org/10.1007/s10570-020-03150-5
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DOI: https://doi.org/10.1007/s10570-020-03150-5