Optical properties and high-frequency (K-band) microwave absorption performance of CoFe2O4@Bi2/3Cu3Ti4O12@Graphene composite

Abstract

Electromagnetic pollution has been on the rise due to advancement in electronics. This type of pollution could affect the operation of electronic devices and may causes radiation related disease. The sol-gel auto-combustion method was used to prepare CoFe₂O₄ and Bi_2/3Cu₃Ti₄O₁₂ whereas mechanical blending was used to prepare CoFe₂O₄@Bi_2/3Cu₃Ti₄O₁₂@graphene composite. The XRD analysis affirm the purity of the prepared samples which was later confirmed by FTIR analysis. The presence of Bi_2/3Cu₃Ti₄O₁₂ and graphene resulted in the reduction of the magnetic interaction which is supported by VSM analysis and the plot of ${\mu }^{\prime }$ and ${\mu }^{″}$. CoFe₂O₄@Bi_2/3Cu₃Ti₄O₁₂@graphene composite possesses the lowest value of $E_g$ (3.76 eV). The magnetic parameters of CoFe₂O₄ tend to decrease with the addition of Bi_2/3Cu₃Ti₄O₁₂ and graphene. The sample CoFe₂O₄@Bi_2/3Cu₃Ti₄O₁₂@graphene composite shows the least $RL$ of $-$ 25.73 dB for an absorber thickness of 2.00 mm at a frequency of 21.59 dB with 3.00 bandwidth of effective absorption. The results demonstrate the possibility of applying CoFe₂O₄@Bi_2/3Cu₃Ti₄O₁₂@graphene composite as an efficient microwave absorber.