The Cavity Perturbation Technique to Detect Cobalt Ferrite and Cobalt Ferrite-Barium Titanate Core-Shell Nanocomposites in the Microwave Frequency Range for Biomedical Applications

Abstract

This paper focuses on the cavity perturbation technique to measure the dielectric properties of nanoparticles: (i) cobalt ferrite (ii) barium titanate and (iii) core-shell cobalt ferrite-barium titanate. The shift in TE₁₀₃ and TE₁₀₅ resonant mode is compared for the above three nanomaterials which in turn is correlated to its dielectric properties. Barium titanate has the highest shift in resonance peak and it is directly proportional to its relative permittivity followed by cobalt ferrite-barium titanate and cobalt ferrite respectively. However, the half power bandwidth, $\Delta f$ is highest for the cobalt ferrite nanoparticles and least for barium titanate. Approximately 1.145 MHz shift and 3.391 MHz shift is observed for the insertion of the lossy core-shell cobalt ferrite in TE₁₀₃ and TE₁₀₅ modes. The quality factor for barium titante was measured to be approximately twice to that of cobalt ferrite for this particular experiment.

Keywords:

• Cavity perturbation
• cobalt ferrite
• cobalt ferrite-barium titanate
• core-shell
• nanocomposites

Acknowledgments

The authors acknowledge the contribution of Dr. Chonglin Chen, The University of Texas at San Antonio and Dr. Yongcan Cao, The University of Texas San Antonio for their valuable insight on the topic.

Disclosure Statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This research is supported by Graduate Assistantship with the Department of Electrical Engineering, The University of Texas San Antonio, and Materials Research Graduate (MRG) Fellowship from MeMDRL Lab, The University of Texas at San Antonio.