检出限
荧光
线性范围
试剂
量子产额
二乙烯三胺
化学
选择性
光致发光
材料科学
碳纤维
分析化学(期刊)
量子点
分析物
纳米技术
色谱法
光电子学
催化作用
光学
物理化学
物理
复合材料
复合数
有机化学
生物化学
作者
Jiangling He,Haoran Zhang,Jinliang Zou,Yingliang Liu,Jianle Zhuang,Yong Xiao,Bingfu Lei
标识
DOI:10.1016/j.bios.2015.12.084
摘要
Herein, we report a simple, one-step reflux method for synthesis of photoluminescent carbon dots (CDs) using citric acid as the carbon source and diethylenetriamine (DETA) as the surface passivation reagent along with a high quantum yield (82.40%), the fluorescence intensity of the CDs was found to be effectively quenched by Hg(II) ions. Upon addition of I(-) to the CDs/Hg(II) complex dispersion, the fluorescence intensity of the CDs was significantly recovered. Furthermore, we developed an "off-on" fluorescence assay for the detection of I(-) using CDs/Hg(II) as a fluorescence probe. This probe enables the selective detection of Hg(II) with a linear range of 0-80 μM and a limit of detection is 0.201 µM and a limit of detection about I(-) is 0.234 µM with a linear range of 0-70 μM. Most importantly, the sensors can be successfully applied to the determination of Hg(II) and I(-) in real lake water and urine of cattles, the "off-on" sensor demonstrates high selectivity, repeatability, stability, which offer this CDs-based "off-on" fluorescent sensor a promising platform for environmental and biological sensing applications.
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