title: Highly thermally conductive papers with percolative layered boron nitride nanosheets.
abstract: In this work, we report a dielectric nanocomposite paper with layered boron nitride (BN) nanosheets wired by one-dimensional (1D) nanofibrillated cellulose (NFC) that has superior thermal and mechanical properties. These nanocomposite papers are fabricated from a filtration of BN and NFC suspensions, in which NFC is used as a stabilizer to stabilize BN nanosheets. In these nanocomposite papers, two-dimensional (2D) nanosheets form a thermally conductive network, while 1D NFC provides mechanical strength. A high thermal conductivity has been achieved along the BN paper surface (up to 145.7 W/m K for 50 wt % of BN), which is an order of magnitude higher than that in randomly distributed BN nanosheet composites and is even comparable to the thermal conductivity of aluminum alloys. Such a high thermal conductivity is mainly attributed to the structural alignment within the BN nanosheet papers; the effects of the interfacial thermal contact resistance are minimized by the fact that the heat transfer is in the direction parallel to the interface between BN nanosheets and that a large contact area occurs between BN nanosheets.
authors.affiliation: Department of Materials Science and Engineering, University of Maryland , College Park, Maryland 20742, United States.
authors.forename: Hongli
authors.initials: H
authors.lastname: Zhu
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Li
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Fang
authors.forename: Jiajun
authors.initials: J
authors.lastname: Xu
authors.forename: Fangyu
authors.initials: F
authors.lastname: Cao
authors.forename: Jiayu
authors.initials: J
authors.lastname: Wan
authors.forename: Colin
authors.initials: C
authors.lastname: Preston
authors.forename: Bao
authors.initials: B
authors.lastname: Yang
authors.forename: Liangbing
authors.initials: L
authors.lastname: Hu