Performances and biosensing mechanisms of interdigitated capacitive sensors based on the hetero-mixture of SnO<inf>2</inf> and In<inf>2</inf> O<inf>3</inf>

Abstract

© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This study aims to discuss the synthesis and fabrication of SnO2-In2 O3-based thick-films and their biosensing applications. The structural characterization of SnO2-In2 O3 nanocomposites was performed using X-ray diffraction, Raman spectroscopy and transmission electron microscopy. Furthermore, the screen-printing technology was used in the fabrication of conductive electrodes to form an interdigitated capacitive structure, and the sensor layer based on the mixture of SnO2 and In2 O3 . Moreover, the sensing performance of the developed structure was tested using Pseudomonas aeruginosa (P. aeruginosa) and Staphylococcus aureus (S. aureus) bacteria. In addition, the validation of sensing characteristics was performed by electrochemical impedance spectroscopic and self-resonant frequency analysis. Finally, the sensing properties were analyzed for two consecutive days, and changes in both P. aeruginosa and S. aureus pathogens growing media were also studied.