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.

A flexible solar-blind 2D boron nitride nanopaper-based photodetector with high thermal resistance

“…After dispersing the NFC and h-BN mixed suspensions in a sonic bath, the material was then filtered and collected on a membrane, followed by drying under mechanical pressure to obtain the BN paper (see Methods). 32 Finally, the flexible BN PDs were fabricated by directly sputtering Pt electrodes onto the BN paper surface through a shadow mask (the dimensions of the device are shown in Fig. S1).…”

Hot pressing-induced alignment of hexagonal boron nitride in SEBS elastomer for superior thermally conductive composites

“…[3][4][5] Therefore, there is an urgent need to develop a new strategy to prepare desired materials with high thermal conductivity. Inorganic llers, such as aluminum nitride, 6,7 alumina, 8,9 or boron nitride, [1][2][3][4][5][10][11][12][13][14][15][16][17] have been added to polymer matrices to improve the thermal performance because of their high thermal conductivity and electric insulation. Hexagonal boron nitride (hBN), also called white graphite, has attracted much attention due to its high thermal conductivity, relatively lower density, and a large band gap (nearly 5.9 eV), which make it suitable for applications in thermally conductive and insulating composites.…”

“…Hexagonal boron nitride (hBN), also called white graphite, has attracted much attention due to its high thermal conductivity, relatively lower density, and a large band gap (nearly 5.9 eV), which make it suitable for applications in thermally conductive and insulating composites. [1][2][3][4]10,13,18,19 In recent years, much effort has been directed to the rational design and controlled preparation of hBN-lled polymer composites. 1,[3][4][5]13,[20][21][22][23][24] As reported previously, the thermal property of hBN-lled composites is mainly inuenced by the interface and dispersion state of hBN in polymer composites.…”

“…[1][2][3][4]10,13,18,19 In recent years, much effort has been directed to the rational design and controlled preparation of hBN-lled polymer composites. 1,[3][4][5]13,[20][21][22][23][24] As reported previously, the thermal property of hBN-lled composites is mainly inuenced by the interface and dispersion state of hBN in polymer composites. 1,4,5,[20][21][22][23]25,26 The interface is mainly inuenced by the compatibility between the llers and matrix.…”

“…1,[3][4][5]13,[20][21][22][23][24] As reported previously, the thermal property of hBN-lled composites is mainly inuenced by the interface and dispersion state of hBN in polymer composites. 1,4,5,[20][21][22][23]25,26 The interface is mainly inuenced by the compatibility between the llers and matrix. Modication by hBN can enhance the affinity of the hBN/polymer interface.…”