Fabrication and Thermal Conductivity Characterization of Ultrathin Films Based on Boron Nitride Nanosheet and Polyimide
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As electronic devices become smaller and higher performance, heat generation is becoming an important issue. Accordingly, a demand for materials capable of efficiently and rapidly releasing heat is rapidly increasing. Because boron nitride nanosheet (BNNS) has excellent thermal conductivity and electrical insulation, it has been widely investigated as an functional nanomaterial in the heat release management. In this study, we have fabricated a series of ultrathin films based on BNNS and polyimide (PI) via spin-coating and following heat treatment. The molecular and morphological structures of BNNS/PI-based ultrathin films were characterized with aids of TEM, AFM, and XPS. The thermal conductivity and associated performance of the ultrathin films were investigated by using Ångström’s method and infrared thermal imaging.