High Crystallinity Boron Nitride Nanosheets: Preparation and the Property of BNNSs/Polyvinyl Alcohol Composite Film

doi:10.15541/jim20180258

Abstract

Abstract:

A kind of hexagonal boron nitride nanosheets (BNNSs) with high crystallinity was synthesized using magnesium borate nanosheets with petal morphology as the template and boron source while ammonia as the nitride source. The morphology and structure of the BNNSs were analyzed by SEM, TEM, XRD, Raman, and FT-IR. The results show that the BNNSs are a kind of single crystalline h-BN with a thickness of about 5 nm and a diameter of 150-300 nm, respectively. The BNNSs aggregate together and inherit the petal shape of magnesium borate. Then, BNNSs/polyvinyl alcohol (PVA) composite films containing different content of BNNSs were prepared. The results show that elastic modulus of the film containing 30% BNNSs is 39.8% higher than that of pure PVA films, while the in-plane thermal diffusivity and thermal conductivity increase about 7 and 8 times, respectively, demonstrating the significant improvement to the thermal performance of PVA by adding this kind of BNNSs.

Key words: boron nitride nanosheets, template, high crystallinity, composite, thermal conductivity

CLC Number:

O611

Ren-Jie GENG, Song-Feng E, Chao-Wei LI, Tao-Tao LI, Jun WU, Ya-Gang YAO. High Crystallinity Boron Nitride Nanosheets: Preparation and the Property of BNNSs/Polyvinyl Alcohol Composite Film[J]. Journal of Inorganic Materials, 2019, 34(4): 401-406.

Figures/Tables 7

Fig. 1 (a) High- and (b) low-magnification SEM images, and (c) XRD pattern of the magnesium borate nanosheets

Fig. 2 (a-b) High- and (c-d) low-magnification SEM images of the BNNSs

Fig. 3 (a-c) TEM images, (d-e) HR-TEM images, and (f) selected area electron diffraction pattern of the BNNSs

Fig. 4 (a) XRD pattern, (b) FT-IR spectrum, (c) Raman spectrum, and (d) UV-Vis spectrum of the BNNSs

Fig. 5 XRD pattern of the crude products

Fig. 6 Influence of the content of BNNSs on the elastic modulus of the BNNSs/PVA composite films with inset showing a picture of the composite film with 30wt% BNNSs

Fig. 7 In-plane (a) and out-plane (b) thermal diffusivity (white histogram) and thermal conductivity (shadow bar graph) of BNNSs/PVA composite films with different filler contents (0, 10wt%, 20wt% and 30wt%)

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