Sudan Shubam, Kaushal Jyotsna, Singh Thakur Gurjeet, Mahmoud Mohamed H, Alexiou Athanasios, Papadakis Marios, Fetoh Mohammed E Abo-El, Batiha Gaber El-Saber
Chitkara University Institute of Engineering and Technology, Chitkara University, Chitkara University, Rajpura, 140401, Punjab, India.
Centre for Water Sciences, Chitkara College of Pharmacy, Chitkara University, Rajpura, 140401, Punjab, India.
Mikrochim Acta. 2025 Jan 15;192(2):88. doi: 10.1007/s00604-024-06939-4.
The hydrothermal synthesis is presented of copper-doped carbon dots (Cu-CDs) from citric acid, urea, and copper chloride, resulting in blue-fluorescent particles with stable emission at 438 nm when excited at 340 nm. Through comprehensive spectroscopic and microscopic characterization (FTIR, XPS, UV, and HRTEM), the Cu-CDs demonstrated remarkable stability across varying pH levels, ionic strengths, temperatures, and UV exposure. Notably, Cu-CDs exhibit ultra-sensitive and selective detection of hexavalent chromium [Cr(VI)] ions in aqueous environments driven by fluorescence quenching. The system showed a robust linear response to Cr(VI) in the 0-80 µM range, with an impressive limit of detection (LOD) of 0.186 µM, significantly lower than the WHO's permissible limit of 0.96 µM. These findings position Cu-CDs as an effective tool for environmental monitoring and water safety applications.
介绍了以柠檬酸、尿素和氯化铜为原料水热合成铜掺杂碳点（Cu-CDs）的方法，该方法可得到蓝色荧光颗粒，在340nm激发时，在438nm处有稳定发射。通过综合光谱和显微镜表征（FTIR、XPS、UV和HRTEM），Cu-CDs在不同pH值、离子强度、温度和紫外线照射下表现出显著的稳定性。值得注意的是，Cu-CDs在水环境中通过荧光猝灭对六价铬[Cr(VI)]离子表现出超灵敏和选择性检测。该系统在0-80µM范围内对Cr(VI)表现出稳健的线性响应，检测限（LOD）低至0.186µM，显著低于世界卫生组织规定的0.96µM的允许限值。这些发现表明Cu-CDs是环境监测和水安全应用的有效工具。
