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Abstract
Conductive polymer polyaniline (PANI) was synthesized by oxidative polymerization of aniline hydrochloride as a source of aniline and ammonium persulfate as an oxidation agent. The polymerization process is relatively easy and cheap. The reaction was carried out in presence of polymer substrate, in our case polyethylene terephthalate (PET) as a representative of smooth surface substrate and polyvinylidenfluoride (PVDF) nanofibers membrane as a representative of porous substrate. Both these substrates were covered by polyaniline (PANI) and used as a sensing element for organic vapors detection. The detection was made by measuring and the record of the change of resistivity during adsorption and desorption of saturated vapors. The result shows that sensitivity decreases with increasing polarity of chosen solvent in order N,N- Dimethylformamide (DMF), N,N-Dimethylacetamide (DMAc) and Dimethyl sulfoxide (DMSO). The PANI base sensing element on PVDF substrate improves sensitivity, selectivity and it also has good reversibility and repeatability.
Highlights
Conducting polymers were first discovered in 1976 by MacDiarmid, Shirakawa and Heeger [1]
FTIR spectra of the PANI coated and uncoated polyethylene terephthalate (PET) and PVDF membrane were collected on the NICOLET 6700 FTIR Spectrophotometer using attenuated total reflectance ATR-FTIR
The synthesis was made on two different substrates PET foil and PVDF membrane which is made by electrospinning technology
Summary
Conducting polymers were first discovered in 1976 by MacDiarmid, Shirakawa and Heeger [1]. Emeraldine salt is a conductive polyaniline polymer. Different membranes has been used to coat PANI and used sensors. We are using PET foil and PVDF membrane as substrate for PANI.
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