Structural and Electromagnetic Shielding Effectiveness of Carbon-coated Cobalt Ferrite Nanoparticles Prepared via Hydrothermal Method

Abstract

|The rapid advancement of communication technology has led to an increase in electromagnetic interference (EMI), or electromagnetic (EM) pollution. This is a cause for concern, as EMI can disrupt communication services, damage electronic equipment, and pose health risks. Regulatory bodies are working to develop standards for the safe use of wireless devices, but the problem of EMI is likely to continue to grow as the number of Internet of Thing (IoT) devices continues to increase. To address this issue, this study investigated the effectiveness of carbon-coated cobalt ferrite nanoparticles as a potential material for electromagnetic shielding. The synthesis of cobalt ferrite (CoFe 2 O 4 ) nanoparticles was successfully achieved using the co-precipitation method. Subsequently, a carbon coating was applied to the nanoparticles through a hydrothermal process using a 200 mL autoclave made of te(cid:13)on-lined stainless steel. This process was carried out at a temperature of 180 ◦ C for a duration of 12 hours, with a heating rate of 8 ◦ C per minute. This study examined both uncoated and carbon-coated CoFe 2 O 4 nanoparticles at various ratios of glucose to CoFe 2 O 4 (1 : 1 ; 2 : 1, and 3 : 1) using techniques such as X-ray diffraction (XRD), (cid:12)eld emission scanning electron microscopy (FESEM), and higher resolution transmission electron microscopy (HRTEM) analysis. The XRD analysis revealed distinct and well-de(cid:12)ned peaks corresponding to CoFe 2 O 4 , indicating the successful synthesis of the nanoparticles. The crystallite size of the uncoated CoFe 2 O 4 nanoparticles was measured to be 11.47 nm, while for the carbon-coated CoFe 2 O 4 , the average crystallite size was determined to be 14.15 nm through XRD analysis