Browsing by Author "Shivani"

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    Electrochemical Detection of Catechol using Synthesized Titanium Oxide Nanoparticles
    (Center of Excellence in Electrochemistry, Univ. of Tehran, 2025) Bindu, A.G.; Bhat, R.S.; Shivani; Hegde, A.
    The fabrication of advanced electrodes has garnered significant attention due to their exceptional sensitivity and selectivity for detecting catechol samples. Titanium dioxide nanoparticles (TiO2 NPs) have emerged as highly effective modifiers for carbon paste electrodes (CPEs), attributed to their unique electrochemical characteristics and enhanced conductivity. In this study, TiO2 NPs are prepared via the combustion method (CM), offering a reliable strategy for boosting electrode performance. This work aims to synthesize the TiO2 NPs by using Titanium (III) sulfate as precursor materials, and citric acid as fuel to get the desired TiO2 NPs. The confirmation of NPs is done through various techniques such as field emission scanning microscopy (FESEM), microstructure analysis by XRD, elemental composition by EDS, and absorption vibration levels by Raman spectroscopy. TiO2 NPs are used for the development of electrode applications to determine catechol (CC) using carbon paste electrodes (CPE). The electrode surface is modified into a TiO2 composite carbon paste electrode (TiCCPE). The electrochemical techniques are performed using a phosphate buffer solution (BS) of 0.1 M at a pH range of 7.0 of a two-electron transfer system with scan rates variation from 0.50-0.400 V/s signifies reaction of absorption-controlled process, and concentration studies from 0.2 µM to 1.6 µM with detection and quantification limit of 0.21 µM and 0.71 µM and was found using Linear sweep voltammetry technique (LSV). The electrode modification associated with synthesized TiO2 NPs assists in an outstanding way to sense the CC, as good sensitivity, stability, selectivity, and reproducibility of catechol detection were assessed using electrochemical techniques throughout the studies. © 2025, Center of Excellence in Electrochemistry, Univ. of Tehran. All rights reserved.
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    Magnesium doped silver ferrite nanohybrid for identification of dihydroxybenzene isomers
    (Elsevier Inc., 2025) Shivani; Bhat, R.S.; Sajankila, S.P.; Badekai Ramachandra, B.R.
    The electrochemical identification of dihydroxybenzene isomers (DHBIs) using the magnetic transition metal oxide (TMO) nanohybrid is one of the best approaches for the study of electrochemical sensors. The DHBIs mainly include the catechol (CL), hydroquinone (HE), and resorcinol (RL). From this point of view, the ternary magnesium-doped silver ferrite (Mg-AgFe2O3) nanohybrid is prepared via the combustion approach, utilizing transition metal salts. The phase structure of the prepared nanohybrid is evaluated by X-ray diffraction (XRD). The surface characteristics were analyzed through Field emission scanning electron microscopy (FESEM). The elemental composition is confirmed by Energy dispersive X-ray (EDX) spectroscopy. The soft magnetic nature of the nanohybrid is evaluated by a Vibrating sample magnetometer (VSM). The prepared Mg-AgFe2O3 nanohybrid is fabricated on the glassy carbon electrode (GCE). The electrode surface is electro-polymerized with glycine, which forms the poly-glycine-reduced graphene oxide-Mg-AgFe2O3-GCE (PG-rGO-Mg-AgFe2O3-GCE). The enhanced electrochemical activity of the prepared electrode for DHBI detection is attributed to the synergistic interaction among the magnetic Mg–AgFe2O3 nanohybrid, reduced graphene oxide (rGO), and the PG diffusion layer. The electrode fabrication is examined through Electrochemical impedance spectroscopy (EIS). The fabricated GCE surface is studied for the electrochemical redox identification of DHBIs by cyclic voltammetry (CV), linear sweep voltammetry (LSV), and differential pulse voltammetry (DPV) techniques. At the optimized pH, the modified electrode surface detects CL, HE, and RL at a limit of detection (LOD) and in the linear range of 0.039 µM (0.4–5.0 µM), 0.036 µM (0.3–3.5 µM), and 0.0086 µM (0.2–3.4 µM), respectively. The fabricated electrode simultaneously detects CL and RL is analyzed using the DPV method. The PG-rGO-Mg-AgFe2O3-GCE surface electrochemically identifies the CL, HE, and RL even in the presence of organic and inorganic interferents. Therefore, the modified electrode surface exhibits high specificity, sensitivity, repeatability, and reproducibility factors for electrochemical identification of the DHBIs. © 2025 Elsevier B.V.