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首页> 外文期刊>Journal of Applied Polymer Science >Electromagnetic interference shielding properties of graphene quantum-dots reinforced poly(vinyl alcohol)/polypyrrole blend nanocomposites
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Electromagnetic interference shielding properties of graphene quantum-dots reinforced poly(vinyl alcohol)/polypyrrole blend nanocomposites

机译：石墨烯量子点增强聚（乙烯醇）/聚吡咯混合物纳米复合材料的电磁干扰屏蔽性能

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摘要

Graphene quantum dots (GQDs) reinforced poly(vinyl alcohol) (PVA)/polypyrrole (WPPy) nanocomposite films with various GQDs loadings were synthesized using the versatile solvent casting method. The structural and morphological properties of PVA/WPPy/GQDs nanocomposite films were investigated by employing Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy. The thermogravimetric analysis revealed enhanced thermal stability of synthesized nanocomposites while enhanced dielectric properties were also observed. The maximum dielectric constant value for PVA/WPPy/GQDs nanocomposite films was observed to be epsilon = 6,311.85 (50 Hz, 150 degrees C). The electromagnetic interference (EMI) shielding effectiveness (SE) of nanocomposite films was determined in the X-band (8-12 GHz) and Ku-band (12-18 GHz) frequency region. The EMI SE was found to be increased from 0.8 dB for the pure PVA film to 9.8 dB for the PVA/WPPy/GQDs nanocomposite film containing 10 wt% GQDs loading. The enhanced EMI shielding efficiency of nanocomposite films has resulted from the homogenous dispersion of GQDs in PVA/WPPy blend nanocomposites. Thus, the prepared nanocomposites are envisioned to utilize as a lightweight, flexible, and low-cost material for EMI shielding applications.
机译：使用多功能溶剂浇铸法合成石墨烯量子点（GQDS）增强聚（乙烯醇）（PVA）/聚吡咯（PVA）/聚吡咯（WPPY）纳米复合膜的各种GQDS载体。通过采用傅里叶变换红外光谱，X射线衍射和扫描电子显微镜研究PVA / WPPY / GQDS纳米复合膜的结构和形态学性能。热重分析显示了合成纳米复合材料的增强的热稳定性，同时还观察到增强的介电性质。观察到PVA / WPPY / GQDS纳米复合膜的最大介电常数值是EPSILON = 6,311.85（50Hz，150℃）。在X波段（8-12GHz）和Ku波段（12-18GHz）频率区域中测定纳米复合膜的电磁干扰（EMI）屏蔽效果（SE）。发现EMI SE从纯PVA薄膜的0.8dB增加到含有10wt％GQDS负载的PVA / WPPY / GQD纳米复合膜的9.8dB。纳米复合膜的增强的EMI屏蔽效率是由于GQD在PVA / WPPY混合物纳米复合材料中的均匀分散。因此，设想制备的纳米复合材料以用作EMI屏蔽应用的轻质，柔性和低成本的材料。

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