期刊
ANALYST
卷 141, 期 15, 页码 4685-4693出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6an00740f
关键词
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资金
- National Basic Research Program of China [2011CB933700]
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China (NSFC) [41521001]
- Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) [2014029]
The instant and on-site detection of selenium still remains a challenge for environmental monitoring and medical prevention. We herein developed a ratiometric fluorescent nanosensor for accurate and on-site sensing of SeO32- by linking the recognition molecule 3,3'-diaminobenzidine (DAB) onto the surface of carboxyl group modified CdTe@SiO2. The fluorescence of DAB on the surface of silica nanospheres could be selectively and efficiently enhanced by SeO32- through a surface chelating reaction between DAB and SeO32-. Thus, in the presence of SeO32-, the nanosensor would show two characteristic fluorescence emissions of Se-DAB and CdTe QDs under a single excitation wavelength. The selectivity and the optimal conditions for the detection of SeO32- were carefully investigated. The ratio of F-530/F-635 linearly increased with increasing SeO32- concentration in the range of 0 to 2.5 mu M and the detection limit reaches as low as 6.68 nM (0.53 ppb). This developed nanosensor has the capability of on-site detection in an aqueous system without any separation step. The Se concentrations in selenium-rich food were detected and the results were consistent with the values determined by ICP-AES.
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