In this report, we have developed a scalable approach to massive synthesis of hexagonal/turbostratic composite boron nitride nanosheets (h/t-BNNSs). The strikingly effective, reliable, and high-throughput (grams) synthesis is performed via a facile chemical foaming process at 1400°C utilizing ammonia borane (AB) as precursor. The characterization results demonstrate that high quality of h/t-BNNSs with lateral size of tens of micrometers and thickness of tens of nanometers are obtained. The growth mechanism of h/t-BNNSs is also discussed based on the thermogravimetric analysis of AB which clearly shows two step weight loss. The h/t-BNNSs are further used for making thermoconductive h/t-BNNSs/epoxy resin composites. The thermal conductivity of the composites is obviously improved due to the introduction of h/t-BNNSs. Consideration of the unique properties of boron nitride, these novel h/t-BNNSs are envisaged to be very valuable for future high performance polymer based material fabrication.
Bibliographical noteKAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported by the National Natural Science Foundation of China (51172050, 51102060, 51102063, 51202045 and 51672059), the Postdoctoral Science Foundation of China (2013M531036), Shandong Province Young and Middle-Aged Scientists Research Awards Fund (BS2013CL003), the Fundamental Research Funds for the Central Universities (HIT. ICRST.2010009), the Natural Scientific Research Innovation Foundation in Harbin Institute of Technology (HIT.NSRIF.2011109, HIT.NSRIF.2010121), and the Scientific Research Foundation of Harbin Institute of Technology at Weihai (HIT(WH)X201108). The authors acknowledge Mr. Baoyou Zhang and Dr. Guohua Fan for their technical assistance with FESEM and HRTEM observations, respectively.