Lee Tae Yoon
Department of Biomedical Engineering and Department of Convergence System Engineering, Chungnam National University, Daejeon 34134, Republic of Korea.
Department of Biomedical Engineering and Department of Convergence System Engineering, Chungnam National University, Daejeon 34134, Republic of Korea; Department of Technology Education, Chungnam National University, Daejeon 34134, Republic of Korea.
Spectrochim Acta A Mol Biomol Spectrosc. 2024 Dec 15;323:124841. doi: 10.1016/j.saa.2024.124841. Epub 2024 Jul 16.
The presence of trace water impurities in organic solvents can significantly influence chemical reactions and product quality; thus, the accurate detection of water content in these solvents is a critical requirement for industrial applications. Accordingly, an eco-friendly, effective, and economical sensor for detecting trace quantities of miscible water in organic solvents is required for industrial applications. In this study, we synthesized biomass-derived multi-atom-doped carbon dots (MACDs) as fluorescent probes and employed them for the detection of trace amounts of water impurities in several water-miscible organic solvents. The MACDs exhibited stable dual-color fluorescence emission under ultraviolet light irradiation and red and blue emissions in organic solvents and water. The fluorescence quantum yield was approximately 11 %, which indicates an excited intraparticle proton transfer response due to an increase in the water content within a wide response range from 0 % to 100 % (v/v) in organic solvents. The intensity of the red emission signal at 670 nm gradually decreased with an increase in the water content in the organic solvent. The MACDs could detect water with an instant response time of 55 s, a high sensitivity, and low limits of detection of 0.08 %, 1.36 %, 0.03 %, 0.04 %, 0.12 %, and 0.05 % (v/v) in ethanol, acetonitrile, dimethylformamide, methanol, isopropanol, and tetrahydrofuran, respectively. Hence, biomass-derived MACDs can serve as efficient and eco-friendly water sensors in organic solvents.
有机溶剂中痕量水杂质的存在会显著影响化学反应和产品质量；因此，准确检测这些溶剂中的水分含量是工业应用的关键要求。相应地，工业应用需要一种环保、有效且经济的传感器来检测有机溶剂中微量的可混溶水。在本研究中，我们合成了生物质衍生的多原子掺杂碳点（MACD）作为荧光探针，并将其用于检测几种与水混溶的有机溶剂中的微量水杂质。MACD在紫外光照射下表现出稳定的双色荧光发射，在有机溶剂和水中分别发出红色和蓝色发射光。荧光量子产率约为11%，这表明在有机溶剂中0%至100%（v/v）的宽响应范围内，由于含水量增加而产生了激发态粒子内质子转移响应。670nm处红色发射信号的强度随着有机溶剂中含水量的增加而逐渐降低。MACD可以在55秒的即时响应时间内检测水，具有高灵敏度，在乙醇、乙腈、二甲基甲酰胺、甲醇、异丙醇和四氢呋喃中的检测限分别为0.08%、1.36%、0.03%、0.04%、0.12%和0.05%（v/v）。因此，生物质衍生的MACD可以作为有机溶剂中高效且环保的水传感器。
