期刊
RSC ADVANCES
卷 4, 期 8, 页码 3701-3705出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra45893h
关键词
-
资金
- National Natural Science Foundation of China [21075018, 21305017]
- Program for New Century Excellent Talents in Chinese University [NCET-10-0019]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1116]
A simple, sensitive, rapid fluorescence (FL) sensor has been developed to detect cyanide ions (CN-) based on the branched polyethylenimine-capped carbon quantum dots (BPEI-GQDs). The amino groups at the surfaces of BPEI-GQDs can selectively and sensitively capture copper ions (Cu2+) to form absorbent cupric amine, which can quench the FL of BPEI-GQDs through an inner filter effect. CN- can combine strongly with Cu2+ to [Cu(CN)(x)](n-) species, preventing Cu2+ from being captured by the amino groups of BPEI-GQDs. As a result, Cu2+ can't quench the FL of BPEI-GQDs anymore in the presence of CN-. In other words, CN- can turn on the FL signal of BPEI-GQDs/Cu2+ system, producing a recovered FL signal. After optimizing experimental conditions, we demonstrated that this easy methodology could offer a sensitive, selective, simple and rapid method for detection of CN- with a detection limit of 0.65 mu M (S/N = 3) and a linear response range of 2 to 200 mu M.
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