| 硝酸辅助合成水溶性绿光碳点及其在pH测量与Fe3+检测中的应用 |
| Nitric Acid Assisted Synthesis of Water-Soluble Green Fluorescent Carbon Dots for pH Measurement and Fe3+ Ions Detection |
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| 摘要: 以柠檬酸、甲酰胺与浓硝酸为原料合成了绿色荧光碳点（CDs），对其物相、形貌及荧光性能进行了表征，并研究了其在离子检测及荧光标记方面的应用。结果表明：所合成的CDs呈现良好的水溶性；当以360~460 nm波长的光激发时，该CDs发出明亮的绿色荧光，并且发射峰的位置不随激发光波长而改变，其量子产率高达44.2%；同时，该绿光CDs对pH敏感，体系pH值在4.5~8.5范围内时，其归一化荧光强度与pH间有较好的线性关系；此外，该绿光CDs对Fe3+有较好的选择性响应，在0~1 000 μmol·L-1范围内，体系的荧光淬灭效率（I0/I）与Fe3+浓度有良好的线性关系，检出限为9.8 μmol·L-1。 |
| 关键词: 绿光碳点 水溶性 荧光材料 铁离子检测 pH响应 |
| 基金项目: 广西自然科学基金重大项目（No.2016GXNSFEA380001）、桂林市科学研究与技术开发重点项目（No.20170108-10）和桂林医学院博士科研启动项目（No.31304018001）资助。 |
| Abstract: A green fluorescent carbon dots (CDs) was synthesized from citric acid, formamide and concentrated nitric acid. The phase compositions, morphologies and fluorescence properties were characterized. The applications of the as-prepared CDs in ion detection and fluorescence imaging were studied as well. The results show that the as-synthesized CDs presented a good water-solubility and emitted bright green fluorescence with an excitation-independent photoluminescence (PL) behavior when the excitation wavelength ranged from 360 to 460 nm. The quantum yield was as high as 44.2%. Meanwhile, the green fluorescent CDs was pH sensitive and the normalized fluorescence intensity was linearly proportional to the pH values of solutions in a range of 4.5~8.5. Furthermore, the CDs also exhibited excellent selective response to Fe3+ with a good linear relationship between the fluorescence quenching efficiency (I0/I) and the Fe3+ concentration in a range of 0~1 000 μmol·L-1, and the detection limit was calculated to be 9.8 μmol·L-1. |
| Keywords: green fluorescent carbon dots water-soluble fluorescent imaging material iron ion detection pH response |
| 投稿时间：2019-12-27 修订日期：2020-04-22 |
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| 康亚超,黄园媛,孙化振,郑万里,马献力,蒋东丽.硝酸辅助合成水溶性绿光碳点及其在pH测量与Fe3+检测中的应用[J].无机化学学报,2020,36(9):1744-1752. |
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