Carbonized polydopamine nanoparticle reinforced graphene films with superior thermal conductivity
Carbonized polydopamine nanoparticle reinforced graphene films with superior thermal conductivity
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DOI：
10.1016/j.carbon.2019.04.038
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发表时间：
2019-08
期刊：
影响因子：
10.9
通讯作者：
R. Zou;Feng Liu;N. Hu;H. Ning;Xiaoping Jiang;Chaohe Xu;S. Fu;Yuanqing Li;Xiaoyuan Zhou
中科院分区：
文献类型：
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作者：
R. Zou;Feng Liu;N. Hu;H. Ning;Xiaoping Jiang;Chaohe Xu;S. Fu;Yuanqing Li;Xiaoyuan Zhou
电子元件变得越来越小型化和复杂化，导致发热水平增加。迫切需要开发具有优异导热性的轻质和超薄材料来改善热管理。在这里，通过真空过滤氧化石墨烯-聚多巴胺（GO-PDA）溶液并对所得GO-PDA薄膜进行石墨化来制备石墨烯薄膜（GF）。在 GO-PDA 薄膜中，GO 片材通过 PDA 进行交联和还原。石墨化将PDA转化为具有纳米级石墨晶体结构的碳化PDA纳米粒子（CPDA NPs）。 GF 的石墨烯片通过 CPDA NP 进行共价交联和增强，获得致密且平坦的结构，具有良好的片层排列和高密度，使得 CPDA NP 增强的 GF 具有 47MPa 的拉伸强度、0.89×106Sm−1 的电导率和 1584Wm−1K−1 的高导热率。相比之下，没有PDA的GF的拉伸强度仅为6.4MPa，电导率为0.30×106Sm−1，热导率为244Wm−1K−1。
Electronic components are becoming miniaturized and complicated, leading to increased levels of heat generation. Developing lightweight and ultrathin materials with superior thermal conductivity is urgently required to improve thermal management. Here, graphene films (GFs) were fabricated by vacuum filtration of graphene oxide-polydopamine (GO-PDA) solutions and graphitization of the obtained GO-PDA films. In the GO-PDA films, the GO sheets were crosslinked and reduced by PDA. Graphitization transformed PDA into carbonized PDA nanoparticles (CPDA NPs) with the crystal structure of nanosized graphites. The graphene sheets of GFs were covalently crosslinked and reinforced by the CPDA NPs to acquire a dense and flat structure with good sheet alignment and high density, rendering CPDA NP-reinforced GFs with a tensile strength of 47 MPa, an electrical conductivity of 0.89 × 106S m−1, and a high thermal conductivity of 1584 W m−1K−1. In comparison, the GFs without the PDA only have a tensile strength of 6.4 MPa, an electrical conductivity of 0.30 × 106S m−1, and a thermal conductivity of 244 W m−1K−1.