Bioinspired Engineering of Nanomaterials for Electrocatalytic Sensing of Heavy Metals and Organic Analytes

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dc.contributor.authorDash, Smruti Ranjan
dc.date.accessioned2022-09-29T08:04:17Z
dc.date.accessioned2023-10-19T06:11:10Z
dc.date.available2022-09-29T08:04:17Z
dc.date.available2023-10-19T06:11:10Z
dc.date.issued2021
dc.descriptionSupervisors: Golder, Animes Kumar and Bag, Subhendu Sekharen_US
dc.description.abstractThis work focuses on the bioinspired synthesis of various spherical and tailor-made nanoparticles using reducing and capping agents present in the leaves extract of the Psidium guajava (guava) plant. These bioinspired synthesized nanoparticles were used in the modification of graphite paste electrodes (GPEs) and glassy carbon electrodes (GCEs) by drop-casting method for electrochemical sensing of different organic analytes like ascorbic acid, dipyrone (drug), chlorpyrifos (organophosphate pesticide), and inorganic analytes (heavy metal ions). The mass spectra analysis of the bio-extract revealed the presence of various antioxidants and polyphenols like ascorbic acid, quercetin, chlorogenic acid, caffeic acid, naringenin, and rutin. These components could successfully reduce metal precursors like silver nitrate and chloroplatinic acid to produce stable silver, platinum, and tailor-made bimetallic core-shell Ag@Pt nanoparticles. The biomass residue generated during bio-extract preparation was also used to synthesize carbon dots for electrocatalytic sensing of chlorpyrifos. The fabrication of a miniaturized three-electrode system was also successful for the electrochemical sensing of heavy metal ions. A portable electrochemical sensing device that can be applied for on-field monitoring of heavy metal ions was successfully developed using a fluorine-doped tin oxide based three-electrode system. Silver-coated copper nanorods (Cu@Ag) synthesized in an environmentally friendly method showed improved sensing capabilities than copper nanorods modified FTOs. Cu@AgNR/FTOs could successfully quantify Pb(II), Zn(II), Cd(II), and Hg(II) both in single metal systems and in mixed metal matrices with the detection limits in the nanomolar range. The device showed repeatability of up to 4 cycles, thus providing an alternative to the conventional screen-printed electrodes that are typically single-use devices and generate a lot of plastic wastesen_US
dc.identifier.otherROLL NO.146152008
dc.identifier.urihttps://gyan.iitg.ac.in/handle/123456789/2186
dc.language.isoenen_US
dc.relation.ispartofseriesTH-2726;
dc.subjectMetal Nanoparticles Synthesisen_US
dc.subjectBioinspired Routeen_US
dc.subjectCore-shell Nanoparticlesen_US
dc.subjectBioinspired Nanocompositeen_US
dc.subjectCarbon Dotsen_US
dc.subjectElectrocatalysisen_US
dc.subjectAnodic Stripping Voltammetryen_US
dc.subjectSquare Wave Voltammetryen_US
dc.subjectAscorbic Acid Sensingen_US
dc.subjectHeavy Metal Sensingen_US
dc.subjectDipyrone Sensingen_US
dc.subjectChlorpyrifos Sensingen_US
dc.subjectMiniaturized Sensing Deviceen_US
dc.titleBioinspired Engineering of Nanomaterials for Electrocatalytic Sensing of Heavy Metals and Organic Analytesen_US
dc.typeThesisen_US
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