Nanocomposites composed of cobalt ferrite (CoFe₂O₄), thermoplastic polyurethane (TPU), and fly ash were fabricated to enhance electromagnetic interference (EMI) shielding. The change in electrical conductivity because of increasing the concentrations of fly ash and cobalt ferrite was estimated, and the increase in electrical conductivity was observed in results. Electromagnetic interference (EMI) shielding is the key application area of these nanocomposites in microwave frequency ranging from 0.1 to 20 GHz and in near infrared (NIR) region of wavelength which ranges from 700 to 2500 nm. Maximum DC conductivity achieved was 5.54*10⁻⁷ S/cm. Transmission observance in the NIR region was lower than 0.5%. Highest EMI shielding of 35 dB was achieved at a wide range of frequency from 0.1 to 8 GHz.

制备了由钴铁氧体（CoFe ₂ O ₄），热塑性聚氨酯（TPU）和粉煤灰组成的纳米复合材料，以增强电磁干扰（EMI）屏蔽。估计了由于飞灰和铁氧体钴的浓度增加而引起的电导率变化，结果观察到电导率增加。电磁干扰（EMI）屏蔽是这些纳米复合材料在0.1至20 GHz微波频率以及700至2500 nm波长的近红外（NIR）区域中的关键应用领域。达到的最大直流电导率为5.54 * 10 ^-7 S /厘米 近红外区的透射率低于0.5％。在0.1至8 GHz的宽频率范围内实现了35 dB的最高EMI屏蔽。