Graphene/graphitized polydopamine/carbon nanotube all-carbon ternary composite films with improved mechanical properties and through-plane thermal conductivity
Graphene/graphitized polydopamine/carbon nanotube all-carbon ternary composite films with improved mechanical properties and through-plane thermal conductivity
复制标题
石墨烯/石墨化聚多巴胺/碳纳米管全碳三元复合薄膜具有改进的机械性能和穿面导热性
DOI：
10.1021/acsami.0c18373
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发表时间：
2020
影响因子：
9.5
通讯作者：
Cheng Yan
中科院分区：
文献类型：
--
作者：
Rui Zou;Feng Liu;Ning Hu;Huiming Ning;Youkun Gong;Shu Wang;Kaiyan Huang;Xiaoping Jiang;Chaohe Xu;Shaoyun Fu;Yuanqing Li;Cheng Yan
石墨烯薄膜具有导热性能好、重量轻、柔韧性好、成本低等优点，是一种很有前途的便携式电子器件导热材料。然而，玻璃纤维的机械性能和导热性能较差，限制了其应用。在此，通过蒸发组装的（氧化石墨烯）-PDA@CNT膜的化学还原、碳化、石墨化和机械压实来制造石墨烯-（石墨化聚多巴胺）-（碳纳米管）（G-gPDA-CNT）全碳三元复合膜。GgPDA-CNT膜表现出均匀的全碳复合结构，其中石墨烯、gPDA层和CNT的组分通过强共价键交联。这种独特的结构促进了组分之间的负荷转移和能量耗散，由此显著改善了G-gPDA-CNT膜的机械性能。此外，还促进了电子和声子转移，大大提高了G-gPDA-CNT膜的电导率和热导率，特别是通过平面的热导率。G-gPDA-CNT膜显示出67.5MPa的拉伸强度、15.1%的极限拉伸应变、6.07MJ/m3的韧性、6.7 × 105 S·m-1的电导率、1597 W·m-1·K-1的面内热导率和2.65W·m-1·K-1的贯通面热导率，它们分别为2.24、1.44、3.16、1.46、1.15和3.90倍。
Graphene films (GFs) are promising ultrathin.thermally conductive materials for portable electronic devices.because of their excellent thermally conductive property, light.weight, high flexibility, and low cost. However, the application of.GFs is limited due to their poor mechanical properties and.through-plane thermal conductivity. Here, a graphene-(graphitized.polydopamine)-(carbon nanotube) (G-gPDA-CNT) all-carbon.ternary composite film was fabricated by chemical reduction,.carbonization, graphitization, and mechanical compaction of the.evaporation-assembled (graphene oxide)-PDA@CNT film. The GgPDA-.CNT film exhibited a uniform all-carbon composite.structure in which the components of the graphene, gPDA layers,.and CNTs were cross-linked by strong covalent bonds. This unique.structure promoted the load transfer and energy dissipation.between the components by which the mechanical properties of the G-gPDA-CNT film were substantially improved. Furthermore,.electron and phonon transfers were also promoted, greatly improving the electrical and thermal conductivities, especially the.through-plane thermal conductivity of the G-gPDA-CNT film. The G-gPDA-CNT film showed a tensile strength of 67.5 MPa,.15.1% ultimate tensile strain, toughness of 6.07 MJ/m3, electrical conductivity of 6.7 × 105 S·m−1, in-plane thermal conductivity of.1597 W·m−1·K−1, and through-plane thermal conductivity of 2.65 W·m−1·K−1, which were 2.24, 1.44, 3.16, 1.46, 1.15, and 3.90 times.that of the pure GFs, respectively.