期刊
BIOSENSORS & BIOELECTRONICS
卷 51, 期 -, 页码 40-46出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2013.07.028
关键词
Core-satellite; CdTe/Silica/Au NCs; Hybrid sphere; Ratiometric fluorescent probe; Cu2+
类别
资金
- National Basic Research Program of China [2011CB707703, 2012CB910601]
- National Natural Science Foundation of China [21075069, 21275078]
- Tianjin Natural Science Foundation [11JCZDJC21700]
Herein, we synthesized a novel core-satellite CdTe/Silica/Au NCs hybrid sphere by covalently linking the separately synthesized highly fluorescent bovine serum albumin (BSA) stabilized gold nanoclusters (Au@BSA NCs) to the surface of the amino functionalized CdTe@SiO2 spheres by using the EDC chemistry. Numerous satellites of Au NCs were linked on the surface of the CdTe@SiO2 by the way of amide bonding. The synthesized dual-emission hybrid spheres were further characterized by the transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), UV-vis absorption spectroscopy, Fourier transform infrared (FTIR) spectroscopy, photoluminescence (PL), etc. Finally, the CdTe/Silica/Au NCs hybrid spheres were developed as ratiometric fluorescence probe for the determination of Cu2+ with high sensitivity and selectivity. The fluorescence intensity ratio (F-545 nm/F-655 mn) of the probe against the concentration of Cu2+ showed a good linear relationship from 6.0 x 10(-7) mol L-1 to 100.0 x 10(-7) mol L-1. It showed an excellent reproducibility (0.67% relative standard deviation for 10 replicate measurements of Cu2+ at 40.0 x 10(-7) mol L-1) and low detection limit (4.1 x 10(-7) mol L-1). Furthermore, the ratiometric fluorescent probe was successfully applied in the determination of Cu2+ in vegetable samples with satisfactory results. (C) 2013 Elsevier B.V. All rights reserved.
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