N-掺杂的荧光碳点比率识别Ag+的性能

doi:10.19894/j.issn.1000-0518.210066

摘要/Abstract

摘要： 以中性红和甲酰胺为前驱体,通过一步水热法合成了粒径约为3.88 nm的氮掺杂的碳点(N-CDs)。该碳点具有好的水溶性和光稳定性,并且与Ag⁺的结合呈比率荧光发射的特点,基于此建立了测定Ag⁺的一种新分析方法,进一步考察了离子强度、pH的变化对N-CDs荧光强度的影响。在优化条件下,Ag⁺浓度在0~12 μmol/L的范围与荧光强度的比值(520/580 nm)呈现良好的线性关系,检测限为0.14 μmol/L。干扰研究显示碳点对Ag⁺具有高的灵敏度和好的选择性。二者相互作用的研究表明,碳点通过表面的胺基与Ag⁺结合而实现其选择性识别。将碳点N-CDs应用于实际水样(自来水、泉水和河水)中Ag⁺的检测,加标回收率在98.5%~104.2%之间。

关键词: 碳点, 比率荧光识别, Ag⁺

Abstract: Nitrogen doped carbon dots (N-CDs) with an average size of 3.88 nm were prepared via a one-pot hydrothermal method by using neutral red and formamide as the carbon precursors. The as-synthesized N-CDs exhibit excellent water dispersibility as well as good photostability. Moreover, on the basis of ratiometric fluorescence emission characteristics by the interaction between N-CDs and Ag⁺, a new analytic method has been developed, and the effects of ionic strength and pH on N-CDs are estimated. Under the optimized condition, a good linearity is presented between the Ag⁺ concentration in the range of 0~12 μmol/L and the fluorescence intensity ratio at 520 and 580 nm (520/580 nm). The detection limit is 0.14 μmol/L. The interference research shows that N-CDs have high sensitivity and selectivity for Ag⁺, which could be attributed to the amino groups on the surface of the N-CDs that could bind to Ag⁺ and form the complex of N -CDs-Ag⁺. In addition, the test results based on different water samples (tap water, spring water and river water) for Ag⁺ detection show that the recoveries are within 98.5%~104.2%.

Key words: Carbon dots, Ratio fluorescent detection, Ag⁺

中图分类号:

O657.3

刘巧玲, 任博荣, 刘睿蓉, 李雨霞, 王桂香, 任紫薇, 董川. N-掺杂的荧光碳点比率识别Ag⁺的性能[J]. 应用化学, 2021, 38(11): 1512-1520.

LIU Qiao-Ling, REN Bo-Rong, LIU Rui-Rong, LI Yu-Xia, WANG Gui-Xiang, REN Zi-Wei, DONG Chuan. N-Doped Carbon Dots with Ratio Fluorescent Detection for Ag⁺[J]. Chinese Journal of Applied Chemistry, 2021, 38(11): 1512-1520.

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