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

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Pereira, Camila F. [UNESP]
Olean-Oliveira, André [UNESP]
David-Parra, Diego N. [UNESP]
Teixeira, Marcos F.S. [UNESP]

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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 kΩ 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.



Chemical sensor, Electrochemical device, Impedance, Metallopolymer, Resistive sensor

Como citar

Talanta, v. 190, p. 119-125.