Fabrication and characterization of chitosan-CeO2-CdO nanocomposite based impedimetric humidity sensors.
Int J Biol Macromol
; 194: 377-383, 2022 Jan 01.
Article
em En
| MEDLINE
| ID: mdl-34800523
ABSTRACT
Nanocomposites of chitosan and cerium oxidecadmium oxide (CeO2-CdO) nanopowder were developed to fabricate impedimetric humidity sensors. The low temperature-stirring was used to synthesize CeO2-CdO nanopowder. Average particle size of synthesized nanopowder was 100 ± 20 nm. Various composition of chitosan-CeO2-CdO nanocomposites were developed using echo-friendly (mechanical mixing) technique. Pellets of 13.0 mm diameter and 1.0 ± 0.1 mm thickness were prepared using hydraulic press under the pressure of 375 MPa. Silver paste was used to deposit the electrodes; the length of each electrode was 12.0 mm and the gap between two electrodes was 2.0 ± 0.5 mm. The mechanism of sensing is based on impedimetric change in response to humidity variation. Fabricated sensors showed high sensitivities ranging from -930.0 kΩ/%RH to -2091.1 kΩ/%RH. Response and recovery times are up to 1 s, while the humidity sensing range is 5 to 95%RH. The fabricated sensors are very attractive to use in several devices for environmental monitoring and biomedical applications.
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MEDLINE
Assunto principal:
Óxidos
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Cério
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Compostos de Cádmio
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Quitosana
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Nanocompostos
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Umidade
Idioma:
En
Ano de publicação:
2022
Tipo de documento:
Article