Enhancing electromagnetic interference (EMI) shielding effectiveness (SE) of polymer nanocomposites (PNCs) relies on modification of carbon nanotube (CNT) distributions achieved by controlling fabrication parameters. However, establishing correlations between fabrication parameters, CNT distributions, and SE properties is a challenging task due to the restrictions on the traditionally implemented CNT network detection techniques and qualitative CNT distribution descriptors. Herein an SE enhancing methodology for single‐walled carbon nanotubes/polyimide (SWCNT/PI) nanocomposite films in which AC sinusoidal voltages (5, 10, and 15 V at 10 Hz) are applied during processing to control CNT distribution is presented. The prepared nanocomposite samples are characterized using scattering‐parameter measurements for SE estimation and second‐harmonic electrostatic force microscopy (2ω_e‐EFM) for subsurface CNT network detection. The detected CNT networks are described by implementing the uniform‐distancing (CNT_D), agglomeration (CNT_A), and shielding (CNT_S) quantitative CNT descriptors. The results show enhancement on the nanocomposite SE values with the increment on the CNT_S descriptor, which increases with lower applied voltages during processing. The SWCNT/PI nanocomposite studied herein exhibits a predominant absorption SE mechanism, which makes it a candidate for potential EMI absorber material applications. The proposed methodology represents an alternative for the quantitative assessment of correlations between PNC properties, CNT distributions, and fabrication parameters.

中文翻译：

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通过修改表面碳纳米管的分布来增强聚合物纳米复合材料的电磁干扰屏蔽效果

增强聚合物纳米复合材料（PNC）的电磁干扰（EMI）屏蔽效能（SE）依赖于通过控制制造参数来实现碳纳米管（CNT）分布的改性。但是，由于对传统实现的CNT网络检测技术和定性CNT分布描述符的限制，因此在制造参数，CNT分布和SE属性之间建立相关性是一项艰巨的任务。本文介绍了一种单壁碳纳米管/聚酰亚胺（SWCNT / PI）纳米复合膜的SE增强方法，其中在处理过程中施加了AC正弦电压（10 Hz时为5 V，10 V和15 V）以控制CNT的分布。ω _ë -EFM），用于地下CNT网络检测。通过实现均匀距离（CNT _D），团聚（CNT _A）和屏蔽（CNT _S）定量CNT描述子来描述检测到的CNT网络。结果表明，随着CNT _S描述符的增加，纳米复合材料的SE值增强，而在处理过程中，施加的电压越低，纳米复合材料SE值就越高。本文研究的SWCNT / PI纳米复合材料展现出主要的吸收SE机制，这使其成为潜在的EMI吸收剂材料应用的候选者。所提出的方法代表了定量评估PNC属性，CNT分布和制造参数之间的相关性的替代方法。