当前位置: X-MOL 学术Methods Appl. Fluoresc. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Fluorescent ZnO quantum dots synthesized with urea for the selective detection of Cr6+ ion in water with a wide range of concentrations.
Methods and Applications in Fluorescence ( IF 2.4 ) Pub Date : 2019-06-14 , DOI: 10.1088/2050-6120/ab29c8
Zou Tong 1 , Xinxin Xing , Yue Yang , Ping Hong , Zidong Wang , Rongjun Zhao , Xu Zhang , Sijia Peng , Yude Wang
Affiliation  

Nearly monodisperse Zinc oxide (ZnO) quantum dots (QDs) displayed yellow fluorescence were synthesized using urea as dispersant. In this paper, urea-ZnO QDs were used as fluorescent probe to detect Cr6+ in solution. The emission from the as-synthesized urea-ZnO QDs is selectively quenched when Cr6+ ions were added. Moreover, there are two linear relationships between the quenching of fluorescence intensity and the Cr6+ concentrations ranging from 4 μM to 1000 μM, with the detection limit for Cr6+ at 19.53 nM (on basis of 3σ/slope criterion). The quenching of fluorescence is attributed to aggregation of the QDs and charge transfer between the QDs and Cr6+ by measurements of transmission electron microscopy (TEM) images, UV-visible absorption spectra and fluorescence lifetime.

中文翻译:

用尿素合成的荧光ZnO量子点,可在宽范围的浓度下选择性检测水中的Cr6 +离子。

使用尿素作为分散剂合成了呈黄色荧光的几乎单分散的氧化锌(ZnO)量子点(QDs)。本文采用尿素-ZnO量子点作为荧光探针检测溶液中的Cr6 +。当添加Cr6 +离子时,选择性地猝灭了合成后的尿素-ZnO QD的发射。此外,荧光强度的猝灭与Cr6 +浓度在4μM至1000μM之间存在两个线性关系,Cr6 +的检出限为19.53 nM(基于3σ/斜率标准)。荧光的猝灭归因于量子点的聚集以及量子点和Cr6 +之间的电荷转移,这是通过测量透射电子显微镜(TEM)图像,紫外可见吸收光谱和荧光寿命来实现的。
更新日期:2019-11-01
down
wechat
bug