title: Ratiometric fluorescence detection of mercuric ion based on the nanohybrid of fluorescence carbon dots and quantum dots.
abstract: A novel nanohybrid ratiometric fluorescence probe comprised of carbon dots (C-dots) and hydrophilic CdSe@ZnS quantum dots (QDs) has been developed by simply mixing the blue-emission C-dots with red-emission carboxylmethyldithiocarbamate modified CdSe@ZnS QDs (GDTC-QDs). The nanohybrid ratiometric fluorescence probe exhibits dual emissions at 436 nm and 629 nm under a single excitation wavelength. Due to the strong chelating ability of GDTC on the surface of QDs to mercuric ion (Hg(2+)), the fluorescence of the GDTC-QDs in the nanohybrid system could be selectively quenched in the presence of Hg(2+) while the fluorescence of the C-dots remained constant, resulting in an obviously distinguishable fluorescence color evolution (from red to blue) of the nanohybrid system. The detection limit of this method was found to be as low as 0.1 μM. Furthermore, the recovery result for Hg(2+) in real samples including tap water and lake water by this method was satisfying, suggesting its potential application for Hg(2+) sensing.
authors.affiliation: Department of Chemistry, University of Science & Technology of China, Hefei, Anhui 230026, China.
authors.forename: Benmei
authors.initials: B
authors.lastname: Cao
authors.forename: Chao
authors.initials: C
authors.lastname: Yuan
authors.forename: Bianhua
authors.initials: B
authors.lastname: Liu
authors.forename: Changlong
authors.initials: C
authors.lastname: Jiang
authors.forename: Guijian
authors.initials: G
authors.lastname: Guan
authors.forename: Ming-Yong
authors.initials: MY
authors.lastname: Han
mesh_terms: D002244:Carbon / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry*; D017669:Mercury Compounds / Q000032:analysis*; D015335:Molecular Probes; D036103:Nanotechnology / Q000379:methods* / Q000592:standards; D045663:Quantum Dots; D013050:Spectrometry, Fluorescence / Q000379:methods / Q000592:standards
chemical_list: D005456:Fluorescent Dyes; D017669:Mercury Compounds; D015335:Molecular Probes; D002244:Carbon