可压缩石墨烯/碳纳米管自组装及热导率研究

Self-assembly and thermal conductivity of compressible Graphene/Carbon nanotubes

高功率器件的散热难题已经成为解决电子信息产业技术的关键瓶颈之一,可通过提高热界面材料本身热导率及提高热界面材料的压缩回弹性,以降低其在实际应用中的接触热阻。在修正Hummers法的基础上进行优化,制备氧化石墨;用酸化碳纳米管作为连接氧化石墨壁的桥梁,通过抗坏血酸还原氧化石墨自组装获得石墨烯/碳纳米管气凝胶,并对其热导率及压缩性能进行研究。结果表明,自组装的气凝胶拥有优异的压缩回弹性能,且在80%的压缩下热导率达4 W/(m·K)左右。气凝胶的制备为电子封装中弹性热界面材料的制备提供了简易可行的新途径。

The heat dissipation problem of high power devices has become one of the key bottlenecks to solve the technology of the electronic information industry.Therefore,in addition to improving the thermal conductivity of the thermal interface material itself,it is necessary to improve the compression resilience of the thermal interface material to reduce its contact thermal resistance in practical applications.The modified Hummers method was used to optimize the preparation of graphite oxide,and acidified carbon nanotubes were used as the bridge connecting the walls of graphite oxide.The graphene/carbon nanotubes aerogel was obtained by reducing graphite oxide with ascorbic acid by self-assembly.The thermal conductivity and compression properties of the aerogel were studied.It was found that the self-assembled aerogels had excellent compressive resilience and the thermal conductivity could reach about 4 W/m·K at 80%compression.The aerogel provides a simple and feasible new way for the preparation of elastic thermal interface materials in electronic packaging.