Abstract
Capacitive–resistive humidity sensors based on polythiophene (P3HT) organic semiconductor as an active material hybrid with three types of metallic nanoparticles (NP) (Ag, Al, and Cu) were synthesized by pulsed laser ablation (PLA). The hybrid P3HT/metallic nanoparticles were deposited on indium-tin-oxide (ITO) substrate at room temperature. The surface morphology of theses samples was studied by using field emission scanning electron micrographs (FE-SEM), which indicated the formation of nanoparticles with grain size of about 50nm. The electrical characteristics of the sensors were examined as a function of the relative humidity levels. The sensors showed an increase in the capacitance with variation in the humidity level. While the resistivity While the resistivity decrease nonlinearity in the variation of humidity level from 10% to 100%.. The results show that the recovery and response times were higher for the Al/P3HT/Cu/Al sensor compared with those of the other nanoparticles.
Highlights
For many years, metal oxide semiconductors were essential to fabricate sensors and used in many applications such as industrial process control, toxic and chemical material detection, and environmental monitoring [1, 2]
Organic semiconductors are a new class of π-conjugated backbones of macromolecules, where the electrons can move via an π-electron cloud
The aim of this work was to increase the sensitivity for humidity by using P3HT with different metallic nanoparticles as an active material in manufacturing Al/ P3HT / metallic nanoparticles/Al
Summary
Metal oxide semiconductors were essential to fabricate sensors and used in many applications such as industrial process control, toxic and chemical material detection, and environmental monitoring [1, 2]. Iraqi Journal of Science, 2021, Vol 62, No 4, pp: 1158-1163 sensors to provide better sensitivities for different gases [3, 4]. Their high sensitivities came from their high surface to volume ratio. The main problems of high cost and high temperature fabrication procedures urged the scientists to search for better materials. Organic semiconductors are a new class of π-conjugated backbones of macromolecules, where the electrons can move via an π-electron cloud. They are distinguished by their low cost and easy fabrication. Polythiopene (P3HT) was used extensively in transistors, solar cells, and sensors applications due to its elevated hole mobility, good stability, and good electrical conductivity [8, 9]
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