Silica-coated carbon dots conjugated to CdTe quantum dots: a ratiometric fluorescent probe for copper(II)
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- 作者：Hanbing Rao ; Wei Liu ; Zhiwei Lu ; Yanying Wang ; Hongwei Ge ; Ping Zou…
- 关键词：C ; dot@SiO2@Q ; dots hybrid spheres ; Carbodiimide chemistry ; Dual emission ; TEM ; DLS ; Quenching
- 刊名：Microchimica Acta
- 出版年：2016
- 出版时间：February 2016
- 年：2016
- 卷：183
- 期：2
- 页码：581-588
- 全文大小：2,251 KB
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Wei Liu (1)
Zhiwei Lu (1)
Yanying Wang (1)
Hongwei Ge (1)
Ping Zou (1)
Xianxiang Wang (1)
Hua He (2)
Xianying Zeng (3)
Yongjia Wang (4)
1. College of Science, Sichuan Agricultural University, Ya’an, 625014, People’s Republic of China
2. Animal Genetics and Breeding Institute of Sichuan Agricultural University, Sichuan Ya’An, 625014, People’s Republic of China
3. College of Life Science, Sichuan Agricultural University, Ya’an, 625014, People’s Republic of China
4. Ya’an City Agricultural Products Quality, Safety Monitoring and Testing Center, Ya’an, 625014, People’s Republic of China - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Analytical Chemistry
Inorganic Chemistry
Physical Chemistry
Characterization and Evaluation Materials
Monitoring, Environmental Analysis and Environmental Ecotoxicology - 出版者：Springer Wien
- ISSN：1436-5073
文摘
The surface of CdTe quantum dots (Q-dots) was modified with thioglycolic acid (TGA) and these Q-dots were then covalently conjugated to amino-functionalized silica-coated carbon dots (C-dot@SiO2) via carbodiimide chemistry. The Q-dots form kind of “satellites” on the surface of the C-dot@SiO2 nanoparticles. The nanoparticle conjugates display dual emission (with peaks at 441 nm and 605 nm) under UV excitation and were further characterized by transmission electron microscopy, UV–vis absorption and FTIR spectroscopy. The C-dot@SiO2@Q-dots hybrid spheres are shown to represent a ratiometric fluorescent probe for Cu2+ in that the emission of the Q-dots is quenched by Cu2+, while the emission of the C-dots (which are coated with SiO2) is not quenched. The ratio of the fluorescence intensities at 441 and 655 nm is related to the concentration of Cu2+ in the range from 0.1 to 1.0 μM, with a 0.096 μM lower detection limit. The ratiometric probe was successfully applied to the determination of Cu2+ in (spiked) vegetable and fruit samples by the standard addition method, and recoveries ranged from 96.7 to 100.8 %.