Journal
SENSORS AND ACTUATORS A-PHYSICAL
Volume 295, Issue -, Pages 687-695Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2019.06.050
Keywords
Metal organic frameworks; QCM humidity sensor; ZnCo(2)o(4)/polypyrrole; Bimodal exponential kinetic adsorption model
Funding
- National Natural Science Foundation of China [51777215]
- Key Research & Development Plan Project of Shandong Province [2018GSF117002]
- Fundamental Research Funds for the Central Universities of China [18CX07010A]
- Key Laboratory of Engieering Dielectrics and Its Application (Harbin University of Science and Technology), Ministry of Education [KFZ1801]
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A metal organic frameworks (MOFs)-derived ZnCo2O4/Polypyrrole (ZnCo2O4/PPy) nanocomposite coated QCM humidity sensor with high performance was demonstrated in this paper. The element composition, morphology and nanostructure of the ZnCo2O4/PPy nanocomposite were characterized by energy dispersive spectroscopy (EDS), FT-IR spectrums, X-ray diffraction (XRD), scanning electron microscopy (SEM), and atomic force microscopy (AFM). All humidity sensing tests of ZnCo2O4/PPy QCM sensor were performed under room temperature environment. The experimental results revealed that the ZnCo2O4/PPy sensor exhibits excellent humidity sensing behavior. Comparing with pure PPy and pure ZnCo2O4 sensor, ZnCo2O4/PPy film coated QCM humidity sensor displays higher sensitivity (58.4 Hz/%RH) and better response/recovery properties (8 s/7 s). Besides, the equivalent circuit elements parameters of ZnCo2O4/PPy coated QCM sensor at various RH environments were determined by the modified Butterworth-Van-Dyke (BVD) equivalent circuit model. And the adsorption kinetics of water molecules was investigated by bimodal exponential kinetic adsorption model. (C) 2019 Elsevier B.V. All rights reserved.
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