Abstract：
Abnormal iron ions levels may lead to some diseases and serious environmental pollution. Herein, optical and visual detection strategies of Fe3+ in water based on co-doped carbon dots (CDs) were established in the present study. Firstly, a one-pot synthetic strategy for the preparation of the N, S, B co-doped CDs with a home microwave oven was developed. Secondly, the optical properties, chemical structures, and morphology of CDs were further characterized by fluorescence spectroscopy, Uv-vis absorption spectroscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and transmission electron microscope. Finally, the results indicated that the fluorescence of the co-doped CDs was quenched by ferric ions via the static mechanism and the aggregation of CDs, accompanied by the increased red color. The multi-mode sensing strategies of Fe3+ with fluorescence photometer, UV-visible spectrophotometer, portable colorimeter and smartphone had the advantages of good selectivity, excellent stability and high sensitivity. Fluorophotometry based on co-doped CDs was a powerful probe platform for measuring lower concentrations of Fe3+ due to its higher sensitivity, better linear relationship, lower limit of detection (0.27 μM) and limit of quantitation (0.91 μM). In addition, the visual detection methods with a portable colorimeter and smartphone had been proven to be very suitable for rapid and simple sensing of higher concentrations of Fe3+. Moreover, the co-doped CDs utilized for Fe3+ probes in tap water and boiler water obtained satisfactory results. Consequently, the efficient, versatile optical and visual multi-mode sensing platform could be extended to apply such a visual analysis of ferric ions in the biological, chemical and other fields.
摘要：
铁离子水平异常可能导致一些疾病和严重的环境污染。在这里，本研究建立了基于共掺杂碳点（CD）的水中Fe3的光学和视觉检测策略。首先,制备N的一锅法合成策略，S,开发了具有家用微波炉的B共掺杂CD。其次,光学性质，化学结构,并通过荧光光谱进一步表征了CD的形态，紫外可见吸收光谱，傅里叶变换红外光谱,X射线光电子能谱,和透射电子显微镜。最后,结果表明,三价铁离子通过静态机理和CD的聚集对共掺杂CD的荧光进行猝灭,伴随着红色的增加。荧光光度计对Fe3+的多模式传感策略,紫外可见分光光度计,便携式比色计和智能手机具有选择性好的优点，优异的稳定性和高灵敏度。基于共掺杂CD的荧光光度法由于其更高的灵敏度，是用于测量较低浓度的Fe3+的强大探针平台。更好的线性关系，检测下限(0.27μM)和定量限(0.91μM)。此外,使用便携式比色计和智能手机的视觉检测方法已被证明非常适合快速和简单地检测更高浓度的Fe3。此外，将共掺杂的CD用于自来水和锅炉水中的Fe3探针，获得了令人满意的结果。因此,高效的,通用的光学和视觉多模式传感平台可以扩展到应用这种视觉分析的铁离子在生物,化学和其他领域。
