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

• Autor(a) principal: Pereira, Camila F. [UNESP]
• Data de Publicação: 2018
• Outros Autores: Olean-Oliveira, André [UNESP], David-Parra, Diego N. [UNESP], Teixeira, Marcos F.S. [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1016/j.talanta.2018.07.080; http://hdl.handle.net/11449/176651
• topic: Chemical sensor; Electrochemical device; Impedance; Metallopolymer; Resistive sensor

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.