Synthesis and characterization of nano-fibres graphene oxide for sensing humidity (original) (raw)
2023, Journal of the Pakistan Institute of Chemical Engineers
Relative humidity is the prime parameter in industrial processes, which are measured through the ceramic, metal oxide and polymeric sensors. Ceramic and metal oxide sensors show nonlinear resistive behaviours with increasing relative humidity and high sintering temperature for hydro-desorption. The transformation of ceramic and metallic sensors with polymeric sensors is due to its eco-friendly synthesis fabrication, less heatintensive and high sensitivity. In this research work, a polymeric sensor of enhanced electric properties with sustainable captive and resistive response was synthesised from nano-fibres graphene oxide for sensing humidity. The synthesized graphene oxide through the modified Hammer method was mixed with poly-vinyl alcohol (GO/PVA) in the ratio of 5 wt % for four hours at 90 ºC. Nano fibres of graphene oxide and poly-vinyl alcohol (GO/PVA) solutions were obtained at the 24V DC electric field; 0.5 ml/h feed rate and 10 cm tip-tocollector distance through electrospinning. GO/PVA fibres were deposited on the silver inter-digited electrodes of 8mm and five combs of 20ìm consecutive distance. SEM analysis shows that the fibres were in the nano-range with no major cracks while XRD and FTIR spectrum investigated the fingerprints and functional groups of GO and GO/PVA respectively. The parametric study of resistive and capacitive was analysed at different response and recovery times at various frequencies in the range of 0 % to 82% relative humidity.
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