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Zr doped Barium hexaferrite nanoplatelets and RGO fillers embedded Polyvinylidenefluoride composite films for electromagnetic interference shielding applications
Polymer Testing ( IF 5.1 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.polymertesting.2020.106504
S. Anand , S. Pauline , C. Joseph Prabagar

Abstract In this study, we investigate the effect of M-Type zirconium doped barium hexaferrite nanoparticles addition with reduced graphene oxide (RGO) fillers in Polyvinylidenefluoride (PVDF) matrix to design lightweight and flexible polymer composite films for electromagnetic wave absorption and electromagnetic interference (EMI) shielding. Firstly, Zr doped M-Type barium hexaferrite (BaZrFe11O19) nanoparticles were prepared by sol-gel auto-combustion method and RGO by modified Hummers' method followed by thermal reduction process. PVDF/RGO/BaZrFe11O19 composite films were fabricated using simple solvent casting method. The resultant samples were investigated using various instruments including X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Raman Spectroscopy, High resolution scanning electron microscopy (HRSEM), Energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS) and Vibrating sample magnetometer (VSM) analysis. The EMI shielding effectiveness (SE) of PVDF/RGO/10 wt% BaZrFe11O19 composites films is higher than that of PVDF/RGO/30 wt% BaZrFe11O19 composites in the X-band (8.2 GHz −12.4 GHz) frequency. Inclusion of BaZrFe11O19 nanoplatelets and conductive RGO fillers in the polymer PVDF matrix enhances shielding by conquered absorption with less reflection. The shielding mechanism suggests that in addition to conducting and magnetic losses due to RGO and BaZrFe11O19 respectively, the synergetic effect among RGO, BaZrFe11O19 and PVDF supports shielding by input impedance matching to that of free space, multiple internal reflections from BaZrFe11O19 and subsequent absorption by RGO, eddy current losses, dielectric losses, interfacial polarization losses, and so on. The resultant flexible films show an excellent EMI shielding efficiency (EMI SE) of 48.59 dB at 11.1 GHz for 10 wt% BaZrFe11O19 addition in polymer composite for a very small thickness of 0.2 mm. The higher dielectric loss ( t a n δ e = 1.67) and magnetic loss ( t a n δ μ = 0.41) contribute to the microwave absorption value of 40.98 dB (>99% attenuation) and are found to decrease with the amount of ferrite nanofillers. These results demonstrate that RGO and minimum amount of M-Type doped barium hexaferrite nanofillers embedded with polymer composite films could be one of the promising EMI shielding materials for RADAR and military applications.

中文翻译:

用于电磁干扰屏蔽应用的 Zr 掺杂的六铁酸钡纳米片和 RGO 填料嵌入聚偏二氟乙烯复合膜

摘要 在本研究中,我们研究了在聚偏二氟乙烯 (PVDF) 基体中添加 M 型锆掺杂六铁酸钡纳米粒子与还原氧化石墨烯 (RGO) 填料的效果,以设计用于电磁波吸收和电磁干扰 (EMI) 的轻质柔性聚合物复合薄膜。 ) 屏蔽。首先,采用溶胶-凝胶自燃法制备Zr掺杂的M型六铁酸钡(BaZrFe11O19)纳米颗粒,采用改进的Hummers法制备RGO,然后进行热还原工艺。PVDF/RGO/BaZrFe11O19 复合薄膜采用简单的溶剂浇铸方法制备。使用各种仪器对所得样品进行研究,包括 X 射线衍射 (XRD)、傅里叶变换红外光谱 (FTIR)、拉曼光谱、高分辨率扫描电子显微镜 (HRSEM)、能量色散 X 射线光谱 (EDX)、X 射线光电子能谱 (XPS) 和振动样品磁强计 (VSM) 分析。在X波段(8.2 GHz -12.4 GHz)频率下,PVDF/RGO/10 wt% BaZrFe11O19复合材料薄膜的EMI屏蔽效率(SE)高于PVDF/RGO/30 wt% BaZrFe11O19复合材料。在聚合物 PVDF 基质中包含 BaZrFe11O19 纳米片和导电 RGO 填料,通过减少反射来克服吸收来增强屏蔽。屏蔽机制表明,除了分别由 RGO 和 BaZrFe11O19 引起的传导和磁损耗外,RGO、BaZrFe11O19 和 PVDF 之间的协同效应通过输入阻抗匹配自由空间、BaZrFe11O19 的多次内反射和随后被 RGO 吸收来支持屏蔽, 涡流损耗, 介电损耗, 界面极化损耗等。对于 0.2 毫米的非常小的厚度,在聚合物复合材料中添加 10 wt% BaZrFe11O19 时,所得柔性薄膜在 11.1 GHz 下显示出 48.59 dB 的出色 EMI 屏蔽效率(EMI SE)。较高的介电损耗 (tan δ e = 1.67) 和磁损耗 (tan δ μ = 0.41) 导致微波吸收值为 40.98 dB(> 99% 衰减),并且发现随着铁氧体纳米填料的量增加而降低。这些结果表明,嵌入聚合物复合膜的 RGO 和最少量的 M 型掺杂六铁酸钡纳米填料可能是用于雷达和军事应用的有前途的 EMI 屏蔽材料之一。1 GHz,在聚合物复合材料中添加 10 wt% BaZrFe11O19,厚度仅为 0.2 毫米。较高的介电损耗 (tan δ e = 1.67) 和磁损耗 (tan δ μ = 0.41) 导致微波吸收值为 40.98 dB(> 99% 衰减),并且发现随着铁氧体纳米填料的量增加而降低。这些结果表明,嵌入聚合物复合膜的 RGO 和最少量的 M 型掺杂六铁酸钡纳米填料可能是用于雷达和军事应用的有前途的 EMI 屏蔽材料之一。1 GHz,在聚合物复合材料中添加 10 wt% BaZrFe11O19,厚度仅为 0.2 毫米。较高的介电损耗 (tan δ e = 1.67) 和磁损耗 (tan δ μ = 0.41) 导致微波吸收值为 40.98 dB(>99% 衰减),并且发现随着铁氧体纳米填料的量增加而降低。这些结果表明,嵌入聚合物复合膜的 RGO 和最少量的 M 型掺杂六铁酸钡纳米填料可能是用于雷达和军事应用的有前途的 EMI 屏蔽材料之一。
更新日期:2020-06-01
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