In this work, we report the sol–gel spin-coated novel thin film Aurivillius Phase Layered Bismuth titanate (Bi₄Ti₃O₁₂, BTO) thin film coated on FTO glass substrate annealed at 700 °C was prepared and its detection of mercury ion. The structural orientation, surface morphology, chemical composition, vibrational, and optical properties of the prepared thin film were characterized using XRD, SEM, XPS, Raman, UV–Vis, and PL, respectively. From the XRD analysis, the crystal growth is well preferred in (117) plane corresponding to the orthorhombic structure of BTO. SEM images of the prepared thin film exhibited an anisotropic plate-like grained structure. Photoluminescence spectra showed a good optical emission peak at 545 nm. In Raman spectra, the observed phonon modes are well correlated to the orthorhombic phase of BTO thin films. XPS confirmed the oxidation states of Bi₄Ti₃O₁₂ thin film. The electrocatalytic activity of the prepared BTO thin film electrode concerns mercury detection using cyclic voltammetry (CV) and linear sweep voltammetry (LSV) technique. CV analysis disclosed that the prepared thin film electrode is very active in the electrochemical performance of heavy metal (Hg) detection. LSV result reveals that the prepared thin film exhibits enhanced sensitivity and lower detection limit of electrochemical Hg detection. From the electro-oxidation studies, the BTO thin film electrode acts as a favorable candidate for the application of heavy metal detection.

在这项工作中，我们报告了溶胶-凝胶旋涂新型薄膜 Aurivilius 相层状钛酸铋 (Bi ₄ Ti ₃ O ₁₂, BTO) 薄膜涂覆在 FTO 玻璃基板上并在 700 °C 下退火，并对其进行汞离子检测。分别使用 XRD、SEM、XPS、拉曼、UV-Vis 和 PL 表征所制备薄膜的结构取向、表面形貌、化学成分、振动和光学性质。从 XRD 分析来看，晶体生长在 (117) 平面中是很好的，对应于 BTO 的正交结构。制备的薄膜的 SEM 图像显示出各向异性的板状晶粒结构。光致发光光谱在 545 nm 处显示出良好的光发射峰。在拉曼光谱中，观察到的声子模式与 BTO 薄膜的正交相密切相关。XPS 证实了 Bi ₄ Ti ₃ O ₁₂的氧化态薄膜。制备的 BTO 薄膜电极的电催化活性涉及使用循环伏安法 (CV) 和线性扫描伏安法 (LSV) 技术进行汞检测。CV分析表明，制备的薄膜电极对重金属（Hg）检测的电化学性能非常活跃。LSV 结果表明，制备的薄膜表现出增强的电化学 Hg 检测灵敏度和较低的检测限。从电氧化研究来看，BTO 薄膜电极是重金属检测应用的有利候选者。