Carbon Nanotube/Graphene Nanoribbon/Polyvinylidene Fluoride Hybrid Nanocomposites: Rheological and Dielectric Properties
Carbon Nanotube/Graphene Nanoribbon/Polyvinylidene Fluoride Hybrid Nanocomposites: Rheological and Dielectric Properties
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DOI：
10.1021/acs.jpcc.6b10741
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发表时间：
2017-01-12
影响因子：
3.7
通讯作者：
Sundararaj, Uttandaraman
中科院分区：
文献类型：
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作者：
Arjmand, Mohammad;Sadeghi, Soheil;Sundararaj, Uttandaraman
本研究的结果表明，石墨烯纳米粒子诱导的多壁碳纳米管/石墨烯纳米粒子/聚偏氟乙烯（MWCNT/GNR/PVDF）纳米复合材料的宽带介电性能的巨大协同效应的潜力。使用熔融混合技术在各种纳米填料总含量和MWCNT/GNR重量比下制备纳米复合材料。与纳米复合材料的AC电导率测量相结合的流变学揭示了与GNR相比MWCNT对相邻或交错的高度上级能力;即，多壁碳纳米管具有更高的参与电催化网络的能力。宽带介电谱表明，与MWCNT或GNR二元纳米复合材料相比，MWCNT/GNR/PVDF三元（混合）纳米复合材料具有上级介电性能。例如，在1.5重量%和1000 Hz下，MWCNT/GNR比率为3：1的三元纳米复合材料呈现出41.4和0.91的真实的介电常数和耗散因子，超过了分别为39.3和86.7的真实的介电常数和耗散因子的二元MWCNT纳米复合材料。我们将这种协同效应归因于GNRs作为次级导电纳米填料的交错能力差，其充当额外的纳米电极。事实上，GNR作为额外的纳米电极的作用以及它们桥接MWCNT的不良倾向导致了具有低能量损失的有效纳米电容器结构。
Results of the present study demonstrate the potential of graphene nanoribbon to induce giant synergistic effects in the broadband dielectric properties of multiwalled carbon nanotube/graphene nanoribbon/polyvinylidene fluoride (MWCNT/GNR/PVDF) nanocomposites. The nanocomposites were prepared using a melt-mixing technique at various nanofiller total contents and MWCNT/GNR weight ratios. Rheology coupled with AC conductivity measurements of the nanocomposites unearthed highly superior capability of MWCNT to neighbor or interlace compared to GNR; i.e., the MWCNT has higher ability to participate in a percolative network. Broadband dielectric spectroscopy demonstrated superior dielectric properties for MWCNT/GNR/PVDF ternary (hybrid) nanocomposites compared to the MWCNT or GNR binary nanocomposites. For instance, at 1.5 wt % and 1000 Hz, the ternary nanocomposite with an MWCNT/GNR ratio of 3:1 presented a real permittivity and dissipation factor of 41.4 and 0.91, surpassing the binary MWCNT nanocomposite with a real permittivity and dissipation factor of 39.3 and 86.7, respectively. We attribute this synergistic effect to the poor interlacing ability of GNRs, as secondary conductive nanofillers, acting as extra nanoelectrodes. In fact, the role of GNRs as extra nanoelectrodes in conjunction with their poor propensity to bridge MWCNTs led to effective nanocapacitor structures with low energy loss.