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Recently, there has been an increasing demand in the electronic equipment industry such as mobile phones, laptop computers, and tablets, modems and antennas, which require the shift to centimeter-scale wavelengths in the microwave range . The growth of devices functioning at this GHz frequency range creates the serious risk of electromagnetic interference (EMI) problems. Furthermore, health concern issues are being raised all over the world due to electromagnetic radiation, which could affect human health, resulting in memory loss, fatigue, lack of sleep, headaches, etc. 1 In order to protect biological systems and electronic equipment against potential damage due to electromagnetic (EM) pollution, especially caused by the explosive utilization of gigahertz (GHz) EM waves, a functional material with low density, strong absorption, thin thickness, and wide absorption frequency range is intensively pursued. 2-4 Nowadays, researchers have been attempting to study all kinds of materials which can absorb EM wave by converting EM energy into thermal energy or dissipating them through interference, which depend on their dielectric loss and/or magnetic loss ability. 5 The balance of permittivity and permeability, which is called EM wave impedance matching, is beneficial for

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