Analytical and Environmental Science Division and Centralized Instrument Facility; Academy of Scientific and Innovative Research (AcSIR).
Division of Biotechnology and Phycology, CSIR-Central Salt & Marine Chemicals Research Institute (CSMCRI), Bhavnagar, India; Academy of Scientific and Innovative Research (AcSIR).
Colloids Surf B Biointerfaces. 2018 Jul 1;167:126-133. doi: 10.1016/j.colsurfb.2018.04.008. Epub 2018 Apr 4.
We report a one pot green strategy for the synthesis of carbon dots using tulsi leaves and their potential application in sensing of Cr(VI) selectively. The detection mechanism is based on the phenomenon called inner filter effect (IFE) and a good linear static quenching was observed in the range of 1.6 μM to 50 μM with a detection limit of 4.5 ppb. The reversible switching in fluorescence has been tested and a good recovery in fluorescence was observed up to three consecutive cycles upon addition of ascorbic acid as reducing agent. Also the low toxicity, high fluorescence and photostabilty of the CDs make them excellent imaging and patterning agent. The acid and alkali resistant property of these CDs makes it suitable for real sample analysis. The fluorescent CDs were applied for successful detection of Cr(VI) in water with spike-recoveries ranging from 93 to 99%.
我们报告了一种使用圣罗勒叶一锅绿色合成碳点的策略，以及它们在选择性检测六价铬（Cr(VI)）方面的潜在应用。检测机制基于内滤效应（IFE）现象，在 1.6 μM 至 50 μM 的范围内观察到良好的线性静态猝灭，检测限为 4.5 ppb。已经测试了荧光的可逆开关，并且在添加抗坏血酸作为还原剂时观察到荧光的良好恢复，连续三个循环。此外，碳点的低毒性、高光致发光和光稳定性使其成为优秀的成像和图案化试剂。这些碳点的酸碱抗性使其适用于实际样品分析。荧光碳点成功地用于水样中 Cr(VI)的检测，加标回收率在 93%至 99%之间。
