Ionothermal synthesis of carbon dots from cellulose in deep eutectic solvent: A sensitive probe for detecting Cu2+ and glutathione with “off-on” pattern

深共晶溶剂 纤维素 溶剂 硫黄 碳纤维 荧光 离子液体 水溶液中的金属离子 无机化学 共晶体系 材料科学 化学 金属 光化学 有机化学 催化作用 合金 物理 量子力学 复合数 复合材料
作者
Yumeng Wang,Mi Feng,Bin He,Xinyan Chen,Jianli Zeng,Jian Sun
出处
期刊:Applied Surface Science [Elsevier BV]
卷期号:599: 153705-153705 被引量:19
标识
DOI:10.1016/j.apsusc.2022.153705
摘要

Ultrasensitive and stable carbon dots with “off–on” pattern were prepared from microcrystalline cellulose by one-step ionothermal method in deep eutectic solvents. • Carbon dots (CDs) were prepared from microcrystalline cellulose by one-step ionothermal method in deep eutectic solvents (DESs). • The urea and sulfamic acid-based DES acted both solvent and dopant for making CDs with the best fluorescence intensity. • CDs acted as a sensitive probe for detecting Cu 2+ and glutathione with “Off-on” pattern. • The fluorescence intensity of CDs can still retain 85% after 50 days. Highly sensitive detection of metal ions and biothiols is very important for environment-friendly and human health but under great challenges of high-cost and complex experimental operation. In this work, we reported a simple and effective ionothermal method for the synthesis of nitrogen and sulfur doped carbon dots (N, S-CDs) from cellulose, which can be used as an on–off fluorescent sensor for the sensitive detection of copper ions (Cu 2+ ) and glutathione (GSH). In this process, cellulose was used as a renewable carbon source, and deep eutectic solvent (DES) prepared by urea/sulfamic acid was used as a green solvent and nitrogen sulfur dopant. The as-prepared CDs have excellent optical properties, pH resistance, excellent photostability and hydrophilicity, with a quantum yield (QY) of 7.17% and the fluorescence intensity of the CDs still reached 85% of the initial intensity after 50 days. The fluorescent probe can selectively detect Cu 2+ with a high sensitivity of 23.4 nM. In addition, the addition of GSH can restore the fluorescence of CDs by forming a more stable Cu 2+ -GSH complex. Therefore, the CDs-Cu 2+ complex can be used as a secondary sensor with a detection range of 5.98 μM.
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