量子产额
质子化
荧光
脱质子化
检出限
产量(工程)
碳纤维
紫外线
光化学
化学
分析化学(期刊)
量子点
滤纸
材料科学
核化学
纳米技术
光电子学
色谱法
有机化学
光学
离子
物理
复合数
复合材料
冶金
作者
Chunyu Yu,Xue Li,Xin Qiao,Zhi‐wei Zhang,Danyang Zhang,Hua Liu,Xue-Li Hao,Zhongzhi Wang,Hongpeng You,Liang Zhou
标识
DOI:10.1021/acs.jpcc.2c06449
摘要
Fluorescent carbon quantum dots (r-CDs) were synthesized safely and readily by stirring at room temperature with a yield of 76.5%. The synthesized r-CDs exhibit bright green emission with an absolute quantum yield of 12.0% under the excitation of ultraviolet light. Within the pH range of 3–12, the r-CDs exhibit excellent fluorescence stability. Interestingly, the fluorescence intensity of r-CDs faded promptly when the pH value diminished to 2 and then regained when the pH value returned to 3. This means that r-CDs can be used as "on–off–on" fluorescent probes for pH sensing. The mechanism of this sensitive pH response behavior was discussed in detail, and a possible mechanism of protonation–deprotonation–protonation processes was proposed. In addition, we have proposed a green preparation route for eco-friendly filter paper using anticounterfeiting. Interestingly, the presence of Fe2+ significantly quenched the fluorescence of r-CDs. Experimental results demonstrated the r-CDs can also be used to detect the content of Fe2+ in water, and the detection limit was 8.82 μM/L.
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