A near-infrared turn-on fluorescent nanosensor for zinc(II) based on CuInS2 quantum dots modified with 8-aminoquinoline
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- 作者：Ziping Liu (1)
Guangying Li (2)
Qiang Ma (1)
Linlin Liu (1)
Xingguang Su (1) - 关键词：CuInS2 QDs ; NIR fluorescent nanosensor ; Fluorescence “turn ; on-/li> Zn(II) ; 8 ; aminoquinoline
- 刊名：Microchimica Acta
- 出版年：2014
- 出版时间：August 2014
- 年：2014
- 卷：181
- 期：11-12
- 页码：1385-1391
- 全文大小：590 KB
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Guangying Li (2)
Qiang Ma (1)
Linlin Liu (1)
Xingguang Su (1)
1. Department of Analytical Chemistry, College of Chemistry, Jilin University, Changchun, 130012, China
2. Department of Psychology, The Affiliated Hospital to Changchun University of Chinese Medicine, Changchun, 130021, China - ISSN：1436-5073
文摘
We describe a novel near-infrared (NIR) “turn-on-fluorescent nanosensor for highly sensitive and selective detection of Zn(II) ion. It is based on the use of the fluorescent probe 8-aminoquinoline conjugate to CuInS2 quantum dots. Water-soluble CuInS2 QDs capped by mercaptopropionic acid (MPA) were synthesized in aqueous solution via a hydrothermal method, and the carboxy groups on the surface of the capped QDs were then covalently linked to the amino groups of the probe 8-aminoquinoline to form the conjugate acting as a nanosensor. The fluorescence of the modified QDs is almost completely quenched via a hole-transfer mechanism. If, however, Zn(II) is added, the lone pair electrons of the nitrogen atom of 8-aminoquinoline become involved into the mechanism of binding Zn(II), and hole-transfer quenching is suppressed which results in turn-on fluorescence. The nanoprobe enables Zn(II) to be determined by measurement of the increase in fluorescence intensity. Under optimized experimental conditions, the nanosensor displays a wide and fairly linear response in the 0.005 to 1?mM concentration range, with a 4.5?μM detection limit. The nanosensor reported here was successfully employed to the detection of Zn(II) in spiked tap water samples. Figure 1 The fluorescence of CuInS2 quantum dots (QDs) is quenched by 8-aminoquinoline via the hole-transfer mechanism. In the presence of Zn(II), the hole-transfer process is suppressed which results in turn-on the fluorescence. Therefore, a nanosensor is constructed to detect Zn(II).