Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 194, Issue -, Pages 377-383Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2021.11.079
Keywords
Biomedical devices; Mechanical mixing; Capacitance; Pressing; Frequency; Impedance
Funding
- Research and Development Office (RDO) at the Ministry of Education, Kingdom of Saudi Arabia [HIQI-13-2019]
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Nanocomposites of chitosan and cerium oxide-cadmium oxide nanoparticles were developed to fabricate impedimetric humidity sensors, showing high sensitivity and fast response and recovery times. These sensors are suitable for environmental monitoring and biomedical applications.
Nanocomposites of chitosan and cerium oxide-cadmium 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 k Omega/%RH to -2091.1 k Omega/%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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