Journal
TUNGSTEN
Volume 5, Issue 1, Pages 109-117Publisher
SPRINGERNATURE
DOI: 10.1007/s42864-022-00159-0
Keywords
Cobalt; Coordination polymer; H-bonding interactions; Humidity sensor; Finger detection
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Coordination polymers (CPs) are emerging as the next generation of macromolecule materials in many industrial and technological applications, such as gas/humidity sensing. In this contribution, a new one dimensional (1D) CP with excellent humidity sensing performance and stability has been successfully synthesized.
Coordination polymers (CPs) are emerging as the next generation of macromolecule materials in many industrial and technological applications, e. g. gas/humidity sensing. The design of CP-based sensors with high performance and low cost is of significance, but this work is still in the infancy stage. In this contribution, a new one dimensional (1D) CP has been successfully synthesized by a simple solvent evaporation method at room temperature, namely [Co(DPP)(H2O)(2)](n)center dot(TCA)(2)(H2O)(4) (named as Co-1, HTCA = 3-thiophenezoic acid, DPP = 1, 3-di(4-pyridyl)propane). The Co-1 structure contains abundant H-bonding interactions, weaving it from 1D chain structure into three dimensional (3D) pillared-layer structure. As an impedimetric humidity sensing material, this CP exhibits short response time, small hysteresis, excellent repeatability, and good stability in the working range of 11%-97% relative humidity (RH). Furthermore, it also shows excellent performance in monitoring the moisture content of human finger skin. By analyzing the complex impedance spectra, the humidity sensing mechanism of Co-1 sensor was expounded at different RH ranges.
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