Abstract
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.
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The authors would like to acknowledge Polymer Composites Research Lab and Centre of Excellence on Advanced Material Research Lab of B.M.S. College of Engineering, Bangalore for providing the research facilities.
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Jisha, P., Suma, M.S. & Murugendrappa, M.V. Synthesis and characterization of WO3-doped polyaniline to sense biomarker VOCs of Malaria. Appl Nanosci 11, 29–44 (2021). https://doi.org/10.1007/s13204-020-01551-3
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DOI: https://doi.org/10.1007/s13204-020-01551-3