A‐Site Doped Aurivillius Layered Perovskite Thin Film (Bi_4‐xDy_xTi₃O₁₂) Electrode for Mercury Ions Sensor

Abstract

Heavy metals are highly polluting the environment and are considered a serious concern. As a result, early detection of these heavy metals is critical. In this research work, we focus on a new electrochemical sensor based on rare earth element (Dysprosium, Dy) modified with Aruvillius layered Perovskite (Bismuth titanate, Bi 4 Ti 3 O 12 , BTO) thin film electrodes with different concentrations of (0, 2 %, 4 %, 6 %) Dysprosium (Dy)was prepared using the sol-gel spin coating method for mercury (Hg 2 + ) ions detection.The X-ray diffraction analysis reveals the prepared sample exhibits a polycrystalline orthorhombic structure. The highest emission peak at 575 nm is discerned in the more visible region corresponding to the transition of 4F 9/2 !6H 3/2 . In the X-ray photoelectron spectro-scopy analysis, the existence of Bi, Ti, O, and Dy is demonstrating the successful formation of prepared material. In the electrochemical section, various parameters such as pH, scan rate, and different concentrations of (Hg 2 + ) ions were investigated. From the Cyclic Voltammetry and Electrochemical Impedance analysis, 4 % Dy doped BTO has been identified as an active electrochemical participant and has low charge transfer resistance. The stability analysis result shows the better stability of the electrode during the cycling for sensing application with a lower detection limit of 1.27 μM. It indicated that the modified 4 % Dy doped BTO thin film electrode can be explored for real-time analysis.

A Fluorescent Polymer Coated Sensor Chip for Mercury Ion (Hg2+) Determination in Lake Water

“…[16] The development of novel fluorescent probes for the sensitive and selective measurement of Hg 2 + has recently received considerable attention. As reported, thin film sensors, membranes, [17] film-based sensors, [18] perovskite thin films, [19] fluorescent gold nanorods [20] and graphene oxide DNA-based sensors [21] do not exhibit very high sensitivity. For some of the reported sensors, the sensitivity is satisfactory, but the sensing process is relatively time-consuming (approximately 1 h).…”