Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 36, Pages 30909-30917Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b08061
Keywords
electrospun; boron nitride nanosheets; thermal conductivity; nanocomposites; PDMS
Funding
- Special Fund of the National Priority Basic Research of China [2014CB239503]
- National Natural Science Foundation of China [51522703, 51477096]
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The continuous evolution toward semiconductor technology in the more-than-Moore era and rapidly increasing power density of modern electronic devices call for advanced thermal interface materials (TIMs). Here, we report a novel strategy to construct flexible polymer nanocomposite TIMs for advanced thermal management applications. First, aligned polyvinyl alcohol (PVA) supported and interconnected 2D boron nitride nanosheets (BNNSs) composite fiber membranes were fabricated by electrospinning. Then, the nanocomposite TIMs were constructed by rolling the PVA/BNNS composite fiber membranes to form cylinders and subsequently vacuum-assisted impregnation of polydimethylsiloxane (PDMS) into the porous cylinders. The nanocomposite TIMs not only exhibit a superhigh through-plane thermal conductivity enhancement of about 10 times at a low BNNS loading of 15.6 vol % in comparison with the pristine PDMS but also show excellent electrical insulating property (i.e., high volume electrical resistivity). The outstanding thermal management capability of the nanocomposite TIMs was practically confirmed by capturing the surface temperature variations of a working LED chip integrated with the nanocomposite TIMs.
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