Journal
TALANTA
Volume 81, Issue 1-2, Pages 433-437Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2009.12.020
Keywords
Silica nanoparticles; Mercury ion; Rhodamine 6G; Ratiometric fluorescence
Categories
Funding
- National Nature Scientific Foundation of China (NSFC) [20775064, 20735002]
- National Basic Research Program of China [2010CB732402]
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Novel ratiometric fluorescent silica nanoparticles with high selectivity towards Hg2+ were synthesized for the detection of Hg2+, Hg2+ promoted the ring opening of spirolactam in the rhodamine moiety grafted onto the silica nanoparticles, resulting in a change in the fluorescence intensity. The fluorescence intensity was proportional to the Hg2+ concentration, and the detection limit (S/N = 3) for Hg2+ was found to be 2.59 x 10(-9) mol L-1 with a linear range from 0.4 to 8 x 10(-7) mol L-1. In addition, the morphology of the silica nanoparticles, the effects of pH and co-existing substances, and the reversibility were investigated. The proposed approach was successfully applied to the determination of Hg2+ in water samples. (C) 2010 Elsevier B.V. All rights reserved.
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