A chemiresistor sensor based on a cobalt(salen) metallopolymer for dissolved molecular oxygen

Abstract:  A resistance detection device for dissolved molecular oxygen in aqueous solutions is prepared using a chemiresistor material as sensor platform. The chemiresistive circuit element is fashioned from a thin film of a cobalt-salen metallopolymer electrodeposited on a platinum electrode. Electrochemical impedance spectroscopy shows that the resistive and capacitive properties of the sensor platform depend on the presence of dissolved oxygen. The electrical circuit models are R(Q/R)(Q/R) and R(Q/R)(Q/RW) in the absence and presence of oxygen, respectively. The chemiresistor sensor exhibits good sensitivity (0.483 k Omega L mg(-1)), excellent reversibility and excellent linearity over a range of dissolved oxygen concentrations typically found under environmental conditions (2.72-40.9 mg L-1). The sensor fabricated in this work can potentially serve as an alternative sensor for the detection of dissolved oxygen in environmental samples.

Author(s): Pereira, CF; Olean-Oliveira, A; David-Parra, DN; Teixeira, MFS

TALANTA

Volume: 190 Pages: 119-125 Published: DEC 1 2018

PDF: A chemiresistor sensor based on a cobalt(salen) metallopolymer for dissolved molecular oxygen

DOI: 10.1016/j.talanta.2018.07.080