Department of Physical and Analytical Chemistry, Faculty of Chemistry, University of Oviedo, Av. Julián Clavería 8, 33006, Oviedo, Spain.
Laboratorio de Investigación y Desarrollo de Métodos Analíticos (LIDMA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, 47 y 115, 1900, La Plata, Argentina.
Mikrochim Acta. 2023 Feb 18;190(3):97. doi: 10.1007/s00604-023-05659-5.
A fast and efficient method was developed for obtaining europium(III)-doped surface-modified carbon dots with a hydrophobic coating. This surface functionalization improved the dispersibility of the nanoparticles in non-polar media, as well as modified the accessibility of water molecules to the europium ions. These two features allowed studying the application of doped carbon dots as moisture nanochemosensor, demonstrating high stability over time of both the photoluminescent signal intensity and the stability of the dispersions. The developed nanochemosensor was used to determine water in toluene with a detection limit of 8.5 × 10 M and a quantification limit of 2.4 × 10 M. The proposed system matches and even improves other methodologies for water determination in organic solvents; it has a low detection limit and a fast response time (almost instantaneous) and requires neither expensive material nor trained personnel. The results suggest a promising future for the development of a new sensing phase for moisture determination in lubricant base oil.
开发了一种快速有效的方法，用于获得具有疏水性涂层的铕(III)掺杂表面修饰碳点。这种表面功能化提高了纳米粒子在非极性介质中的分散性，并改变了水分子与铕离子的可及性。这两个特点使得可以研究掺杂碳点作为水分纳米化学传感器的应用，证明了荧光信号强度和分散体稳定性随时间的高稳定性。开发的纳米化学传感器用于测定甲苯中的水，检测限为 8.5×10 M，定量限为 2.4×10 M。所提出的系统与其他用于有机溶剂中水测定的方法相匹配，甚至更好；它具有低检测限和快速响应时间（几乎瞬间），既不需要昂贵的材料也不需要训练有素的人员。结果表明，为开发用于确定润滑剂基础油中水分的新型传感相，具有广阔的前景。
