Pullanchiyodan Abhilash, S Nair Kanakangi, Surendran Kuzhichalil P
Materials Science and Technology Division, National Institute for Interdisciplinary Science and Technology (NIIST-CSIR), Thiruvananthapuram 695019, India.
Academy of Scientific and Innovative Research (AcSIR), New Delhi 110001, India.
ACS Omega. 2017 Dec 11;2(12):8825-8835. doi: 10.1021/acsomega.7b01436. eCollection 2017 Dec 31.
High-thermal-conductivity and low-dielectric-loss polymer nanocomposites have gained tremendous attention in microelectronics technology. Against this background, the present study deals with the development of a high-thermal-conductivity, low-dielectric-constant, and low-loss polymer nanocomposite based on silver nanoparticle (AgNP)-decorated boron nitride nanosheets (BNNSs) as the filler in poly(methyl methacrylate) (PMMA) matrix. The nanocomposites were prepared through a facile solution-blending process. Elemental mapping of the prepared nanocomposite indicates the uniform distribution of filler particle in PMMA matrix. An impressive high-thermal conductivity (TC) enhancement of around 363% was achieved for nanocomposite of 0.35 of hybrid filler (1.48 W/m K) compared to pristine PMMA (0.32 W/m K). The addition of AgNP reduces the thermal contact resistance ( ) by bridging individual BNNS, thereby improving thermal transport. Measured TC values were fitted with a theoretical model that showed good agreement. Dielectric measurements performed at radiofrequencies and microwave frequencies revealed that the nanocomposites show a low dielectric constant (<5), low loss (10), and very low alternating current conductivity (10 S/cm). The results suggest that silver-decorated BNNS is a promising hybrid filler for effective thermal management.
高导热率和低介电损耗的聚合物纳米复合材料在微电子技术中受到了极大的关注。在此背景下，本研究致力于开发一种基于银纳米颗粒（AgNP）修饰的氮化硼纳米片（BNNSs）作为聚甲基丙烯酸甲酯（PMMA）基体填料的高导热率、低介电常数和低损耗聚合物纳米复合材料。通过简便的溶液共混工艺制备了纳米复合材料。对制备的纳米复合材料进行元素映射表明填料颗粒在PMMA基体中均匀分布。与原始PMMA（0.32W/m·K）相比，含0.35 混合填料（1.48W/m·K）的纳米复合材料实现了约363%的令人印象深刻的高导热率（TC）增强。AgNP的添加通过连接单个BNNS降低了热接触电阻（ ），从而改善了热传输。测量的TC值与理论模型拟合良好，结果吻合。在射频和微波频率下进行的介电测量表明，纳米复合材料具有低介电常数（<5）、低损耗（10）和极低的交流电导率（10 S/cm）。结果表明，银修饰的BNNS是一种用于有效热管理的有前途的混合填料。
