期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 245, 期 -, 页码 386-394出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.01.166
关键词
Carbon dots; Two-photon fluorescence; Simultaneous sensing; Dual-emitting; Switching
资金
- National Natural Science Foundation of China [21305079]
- Natural Science Foundation of Shandong [ZR2014BQ001, ZR2016BB37]
- Postdoctoral Applied Research Project of Qingdao [2015136]
- Project of Shandong Province Higher Educational Science and Technology Program [J14LM02]
Dual-emitting carbon dot/carbon dot (CD1/CD2) conjugates were prepared from combination of poly(ethylenimine)-functionalized CD1 with carboxyl-modified CD2. When excited with a laser of 800 nm, the CD1/CD2 conjugates showed two-photon fluorescence (TPF) emissions peaked at 465 nm (CD1) and 600 nm (CD2). The TPF peak intensities at 465 nm decreased near linearly after the addition of Cu2+ (0-3.2 mu M) due to inner filter effect, with a linear coefficient (R-2) of 0.9933 and a limit of detection (LOD) of 0.05 mu M. The TPF peak intensities at 600nm were almost linearly reduced by Hg2+ (0-8.5 mu M, R-2=0.9970, LOD =0.08 mu M) originating from the nonradiative recombination of excitons through electron transfer. Notably, the TPF peak intensities at 465 and 600nm could be near wholly recovered by respective addition of S2- and I-. Thus, the CD1/CD2 conjugates were developed as a novel TPF dual switching sensor for reversible and simultaneous sensing of Cu2+ and Hg2+. This novel sensor enabled highly selective and sensitive detection of Cu2+ and Hg2+ over other metal ions and biological molecules in real water samples and biological fluids, with high detection recoveries. (C) 2017 Elsevier B.V. All rights reserved.
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