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Polyaniline (PANI) is one of the most studied conducting polymers. Obtained in its conducting form (known as "emeraldine salt") by chemical or electrochemical oxidation of aniline in aqueous acidic medium, this polymer manifests an array of attractive properties. In our work, we investigate the properties of PANI in the form of nanofibers and estab...
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... was pointed out that at a high current density, polymer seeds are firstly deposited on the substrate and then at a lower current density, the polymer nanowire arrays grew from the nucleation sites. These findings were verified from our experimental study and the SEM images shown in Figure 6. ...
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... where the resistivity ρ is computed from the voltage measured for the variations in current values (Qasim et al. 2007). ...
The major goal of this work is to fabricate a chemiresistive sensor using the properties of nanostructured tungsten trioxide (WO3) doped polyaniline (PAni) nanocomposite to detect malaria biomarker volatile organic compounds (VOCs). The nanocomposite with a mixed morphology of fibers and rod-shaped particles is synthesized using a chemical polymerization method. The mixed morphology of the particles provided a large surface area and porous structure to the nanocomposite and hence more ‘target trap zones’ were formed in the sensing layer to produce a drastic change in resistance while sensing a target VOC vapour. The morphological and structural characterization of the nanocomposite was done using FESEM, XRD and FT-IR methods. Electrical and dielectric studies was performed to study the transport properties of the WO3 doped polyaniline nanocomposite at room temperature. The thermal stability characteristics of the nanocomposite was analyzed using TGA (Thermogravimetric analysis). The sensing studies of the drop casted sensors using the nanocomposites were done and sensing and selectivity characteristics were plotted. The sensor showed good selectivity towards the target VOCs. The sensor with a doping concentration of 15% WO3 in the polyaniline matrix has shown a better response and recovery towards the malaria biomarkers 3-Carene and α-Pinene. The sensor can be used to develop a handheld portable device for malaria biomarker detection from human breath.
