Abstract In this study, a sensitive fluorescence sensor was synthesized for the detection of Cu2+ ions based on the quenching of fluorophore. The sensor is composed of pyranine functionalized amino silane shell modified magnetite (Fe3O4) core nanostructures. The synthesized nanomaterials were characterized by Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Powder Diffraction (XRD), Vibrating Sample Magnetometer (VSM) and Transmission Electron Microscopy (TEM). The fluorescent magnetic nanoparticles were analyzed by fluorescence spectroscopy. The characterization data showed that the magnetic core was highly superparamagnetic with an average particles diameter up to 10 nm. The fluorescence response of Fe3O4@-SiO2-NH2-Pyr nanosensor towards Cu2+ ions showed an enhanced and selective fluorescence quenching. Pyranine functionalized magnetic nanoparticles were found to be highly selective for Cu2+ ions without giving any response to other interfering cations and biomolecules. The nanosensor not only provided a sensitive (LOD = 6 nM), fast and selective detection of Cu2+ ions but a new fluorescent and biocompatible material with potential uses in biological and environmental fields.

中文翻译：

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用于灵敏荧光检测 Cu 2+ 离子的吡喃功能化 Fe 3 O 4 纳米颗粒

摘要 本研究合成了一种基于荧光团猝灭的灵敏的荧光传感器，用于检测Cu2+离子。该传感器由吡喃功能化的氨基硅烷壳改性磁铁矿 (Fe3O4) 核纳米结构组成。通过傅里叶变换红外光谱 (FTIR)、X 射线粉末衍射 (XRD)、振动样品磁强计 (VSM) 和透射电子显微镜 (TEM) 对合成的纳米材料进行了表征。通过荧光光谱分析荧光磁性纳米颗粒。表征数据表明，磁芯具有高度超顺磁性，平均粒径可达 10 nm。Fe3O4@-SiO2-NH2-Pyr纳米传感器对Cu2+离子的荧光响应显示出增强的选择性荧光猝灭。发现吡喃功能化磁性纳米粒子对 Cu2+ 离子具有高度选择性，而不会对其他干扰阳离子和生物分子产生任何响应。该纳米传感器不仅提供了对 Cu2+ 离子的灵敏 (LOD = 6 nM)、快速和选择性检测，而且是一种在生物和环境领域具有潜在用途的新型荧光和生物相容性材料。