In the present paper, hetrostructured Bi₂S₃-TiO₂ (BST) nanoparticle (NPs) was synthesized by modified hydrothermal technique using titanium butoxide as precursor of TiO₂ and Bi(NO₃)₃ and thiosemicarbazide as precursors of Bi₂S₃. The synthesized BST NPs was characterized by using XRD, TEM and FTIR spectra. BST NPs form stable dispersion and displays high fluorescence emission at 818 nm. The synthesized nanoparticles show excellent fluorescent property and highly selective for Fe (III) ions due to binding affinity of the BST NPs with Fe (III) ion as evident from the higher value of Stern-Volmer constant (K_sv = 7859 M⁻¹). The number of binding sites of BST NPs was evaluated from the double logarithm regression method and was found to be 0.948. The intensity of the fluorescence emission drop linearly in concentration range from 15 μM to 5000 μM and linear plot of the Stern-Volmer confirmed the static quenching of BST. The optimum pH obtained was 3.35. The detection limit of the synthesis BST sensor was 0.1173 μM.

本文以丁醇钛为TiO _2的前驱体，Bi（NO ₃）₃和硫代氨基脲为Bi ₂ S _3的前驱体，采用改进的水热法合成了纳米结构的Bi ₂ S ₃ -TiO ₂（BST）纳米粒子。。利用XRD，TEM和FTIR光谱对合成的BST NP进行了表征。BST NP形成稳定的分散体，并在818 nm处显示高荧光发射。由于BST NP与Fe（III）离子的结合亲和力，合成的纳米粒子显示出出色的荧光性质和对Fe（III）离子的高度选择性，从较高的Stern-Volmer常数（K _sv = 7859 M ^-1）。通过双对数回归方法评估了BST NPs的结合位点数，结果为0.948。荧光发射强度在15μM至5000μM的浓度范围内呈线性下降，而斯特恩-沃尔默（Stern-Volmer）的线性图证实了BST的静态猝灭。获得的最佳pH为3.35。合成BST传感器的检测限为0.1173μM。