Polyaniline/poly( ε -caprolactone) composite electrospun nanofiber-based gas sensors: optimization of sensing properties by dopants and doping concentration

Electrospinning was utilized to synthesize a polyaniline (PANI)/poly( ε -caprolactone) (PCL) composite in the form of nanofibers to examine its gas sensing performance. Electrical conductivity of the composite nanofibers was tailored by secondary doping with protonic acids including hydrochloride (HCl) or camphorsulfonic acid (HCSA). FT-IR and diffuse reflectance UV–vis spectroscopy were utilized to examine doping-dependent changes in the chemical structure and the protonation state of the nanofibers, respectively. The oxidation and protonation state of the composite nanofibers were shown to strongly depend on the doping agent and duration, demonstrating a simple way of controlling the electrical conductivity of the composite. PANI/PCL electrospun nanofibers having various electrical conductivities via varying dopants and doping concentrations, were configured to chemiresistors for sensing various analytes, including water vapor, NH 3 , and NO 2 . Secondary...



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