Controlled morphology of MWCNTs driven by polymer-grafted nanoparticles for enhanced microwave absorption
Controlled morphology of MWCNTs driven by polymer-grafted nanoparticles for enhanced microwave absorption
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DOI：
10.1039/c7tc02892j
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发表时间：
2017-08
影响因子：
6.4
通讯作者：
Seokjin Yun;A. Kirakosyan;Srivathsava Surabhi;Jong-Ryul Jeong;Jihoon Choi
中科院分区：
文献类型：
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作者：
Seokjin Yun;A. Kirakosyan;Srivathsava Surabhi;Jong-Ryul Jeong;Jihoon Choi
从传统的电子设备到军事和航空航天的特定设备或仪器，开发一种具有更宽带宽和低负载反射损耗的轻量级电磁波吸收材料具有重要的意义。尽管纳米填充物(即碳纳米管、磁性纳米颗粒等)基于聚合物的纳米复合材料(PNC)在这一领域的研究显示出巨大的前景，但通常情况下，对其表面修饰和分散的不良控制阻碍了这些材料在电磁波吸波材料中的进一步发展。在这里，我们介绍并展示了一种基于聚合物接枝纳米颗粒的简单而坚固的平台，以促进纳米填料的可控形态，为策略性地设计具有渗透MWCNT网络和可控NP排列的纳米结构电磁波吸波材料提供了一条途径。与传统的PNC相比，在相同的纳米填充量(1wt%的MWCNT)下，PNC的反射损耗(RL=−26.9dB，5.4Ghz)和带宽(RL<；−10dB4.9 GHz)要大得多。我们发现，聚合物接枝纳米颗粒作为非功能化碳纳米管的基质，并显示出碳纳米管的高分散性，通过将非均相材料(即无机纳米颗粒和碳纳米管)的可控分散所产生的功能结合到一种新型的碳纳米管/纳米颗粒/聚合物纳米结构中，为多功能碳纳米管提供了新的机会。
The development of a lightweight electromagnetic (EM) wave absorber with a wider bandwidth and reflection loss at a low loading is of great interest for applications ranging from conventional electronic devices to specific devices or instruments of the military and aerospace. Although nano-filler (i.e. carbon nanotubes, magnetic nanoparticles, etc.) based polymer nanocomposites (PNCs) have shown great promise in this area of research, typically poor control of their surface modification and dispersion has prevented further development of these materials for application in EM wave absorbers. Here, we introduce and demonstrate a simple and robust platform based on polymer-grafted nanoparticles to facilitate a controlled morphology of nano-fillers, providing a route for strategically designing nanostructured EM wave absorbers with a percolated MWCNT network as well as a controlled NP arrangement. At equal loadings of nano-fillers (1 wt% of MWCNTs), much deeper reflection loss (RL = −26.9 dB at 5.4 GHz) and a wider bandwidth (4.9 GHz for RL < −10 dB) are observed compared to the conventional PNCs. We show that polymer-grafted nanoparticles serve as a matrix for unfunctionalized CNTs and show a much enhanced dispersion of CNTs, providing a novel opportunity for the multi-functional PNCs by combining functions arising from the controlled dispersion of heterogeneous materials (i.e. inorganic nanoparticles and CNTs) in a new type of CNT/NP/polymer nanostructure.