| Cu2+对碳点的荧光猝灭机理研究 |
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| 引用本文： | 王杰,、毛小娇,、郑鹄志,、隆异娟.Cu2+对碳点的荧光猝灭机理研究[J].西南农业大学学报,2015,37(5):123-127. |
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| 作者姓名： | 王杰 、毛小娇 、郑鹄志 、隆异娟 |
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| 作者单位： | 西南大学化学化工学院 ,重庆,400715 |
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| 基金项目： | 国家自然科学基金，西南大学中央高校基本业务费，西南大学博士基金 |
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| 摘 要： | 在pH=5.8的Britton-Robinsion(B-R)缓冲溶液中,Cu2+可有效猝灭O,O-2(3-氨丙基)聚乙二醇1500(PEG1500N)钝化的碳点荧光.通过对猝灭机理的研究得出Cu2+对碳点荧光的猝灭是静态猝灭过程.加入Cu2+后,碳点的荧光强度和紫外吸收都明显减弱,且温度越高猝灭越弱,但荧光寿命没有变化.另外,猝灭速率常数Kq=1013 L/(mol·s)也比典型的溶液中扩散控制猝灭速率常数的上限值高很多,这些都证明该过程是静态猝灭过程.猝灭常数为9.0×104 L/mol,Cu2+与碳点的结合比为6∶1.
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| 关 键 词： | 钝化碳点 Cu2+ 荧光 静态猝灭 |
Study of the Mechanism of Quenching Effect of Cu2+ on Fluorescent Carbon Dots |
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| WANG Jie,MAO Xiao-jiao,ZHENG Hu-zhi,LONG Yi-juan.Study of the Mechanism of Quenching Effect of Cu2+ on Fluorescent Carbon Dots[J].Journal of Southwest Agricultural University,2015,37(5):123-127. |
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| Authors: | WANG Jie MAO Xiao-jiao ZHENG Hu-zhi LONG Yi-juan |
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| Abstract: | We found in a previous study that fluorescence of PEG 1500N-passivated carbon dots (C-Dots ) could be quenched effectively by copper ions (Cu2+ ) in pH 5.8 Britton-Robinsion (B-R) buffer solution .In the present study ,the quenching mechanism was discussed and a static quenching process was supposed .A significant decrease in UV absorption and fluorescent intensity were found after Cu2+ addition .A smaller amount of quenching was also found at higher temperature .But no change in fluorescence lifetime was de-tected .Additionally ,the Kq value of 1013 L/(mol · s) was larger than the upper limit of typical diffusion-controlled quenching in solution .All of the above results confirmed the view of static quenching .The quenching constant was 9.0 × 104 L/mol ,and the binding ratio of Cu2+ to C-Dots was 6:1 . |
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