Preparation and sensing performance of a PANI/MXene@PP complex nonwoven flexible pH sensor
To prepare a dual-electrode flexible pH sensor based on polypropylene spunbonded nonwoven fabric(PP SF),an oil-based polyurethane(OPU)coating was initially applied to the surface of PP SF,and the OPU/PP SF was fabricated.Subsequently,screen printing technology was employed to transfer the reference electrode of silver/silver chloride paste(Ag/AgCl),and conductive carbon paste(C),respectively onto the OPU/PP SF surface.Next,acid-doped polyaniline(PANI)prepared via chemical oxidative polymerization and the superhydrophobically modified F-Ti3C2Tx MXene were coated on the carbon layer to form the PANI/F-Ti3C2Tx MXene@PP SF flexible pH sensor.The results indicate that the surface of the obtained PANI/F-Ti3C2Tx MXene@PP SF flexible pH sensor exhibits a coral-like structure.Within the pH range of 2 to 10,the PANI/F-Ti3C2Tx MXene@PP SF flexible pH sensor demonstrates excellent mechanical properties(with higher tensile strength and elongation at break than those of PP SF),high sensitivity(-37.07 mV/pH),and good linearity(R2=0.98).Furthermore,this flexible pH sensor has low potential change rate(0.092 mV/h)and excellent reproducibility(with a sensitivity standard deviation of 0.36％).This study might serve as reference for the research of flexible pH sensors based on PP SF substrate.
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