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- W4386475609 abstract "Thermally conductive films are essential interface materials placed between a heat source and a heat sink to address the heat dissipation issue, especially for electronic devices confined in narrow spaces. However, developing a thermally conductive film with a combination of high thermal conductivity, good mechanical strength, and excellent electrical properties remains a challenging task. In this study, we aimed to overcome this challenge by preparing composite films using polydopamine (PDA) nanoparticle-functionalized boron nitride nanosheet (BNNS) and poly-p-phenylene benzodiazole (PBO) nanofiber through a combination strategy of deprotonation and hot-pressing techniques. The resulting BNNS@PDA/PBO nanofiber composite film demonstrated an impressive in-plane thermal conductivity of 45.15 W/(m·K), with only 37.5 wt% of BNNS@PDA. This represents the optimal value of thermal conductivity per unit enhancement. Detailed analysis of the heat conduction mechanism confirmed that the PDA-induced nacre lamellar structure and enhanced interfacial interaction were key factors contributing to this high-performance realization. Meanwhile, other necessary properties during film realistic service such as strong mechanical properties (ultimate tensile strength = 104.9 MPa), excellent thermal stabilities (T5% = 670.03 ℃), ultra-low thermal expansion (2.29 ppm/K), low dielectric loss (tanδ = 0.03) and good scratch resistance (wear rate:6.85 × 10−11 m3 N−1 m−1) are also integrally achieved. Intriguingly, the as-prepared films also exhibit a tunable photothermal conversion performance (70 °C rise @0.5 W/mm2 for 120 s). This multifunctionality, combined with its superior performance, highlights the great potential of BNNS@PDA/PBO nanofiber composite films in heat management applications, such as small electronic devices, intelligent wearable equipment, and photothermal therapy." @default.
- W4386475609 created "2023-09-07" @default.
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- W4386475609 date "2023-10-01" @default.
- W4386475609 modified "2023-10-09" @default.
- W4386475609 title "Bio-inspired robust and highly thermal conductive BNNS/PBO nanofiber films with excellent thermal stability, wear resistance, and adjustable photothermal properties" @default.
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- W4386475609 doi "https://doi.org/10.1016/j.cej.2023.145916" @default.
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