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

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

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

Arquivos

2-s2.0-85050755625.pdf (1.21 MB)

Data

2018-12-01

Autores

Pereira, Camila F.

Olean-Oliveira, André

David-Parra, Diego N.

Teixeira, Marcos F.S.

Tipo

Artigo

Direito de acesso

Acesso aberto

Resumo

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.