A fluorimetric/colorimetric mercury sensor based on Au@SiO2 core/shell nanoparticles has been developed and demonstrated. The porphyrin derivative (2) was attached to Au@SiO2 core/shell nanoparticles by covalent bonds and showed a red color and strong fluorescent properties. In the absence of specific metal ions, the porphyrin-functionalized Au@SiO2 nanoparticles (1) exhibited strong fluorescence emission and were red in color. The addition of Hg2+ ion to 1 resulted in a color change from red to green within 10 s and a weak display of fluorescence. Conversely, no significant changes in fluorescence emission or color were observed in the parallel experiments with Li+, Na+, Ca2+, Cu2+, Cd2+, Co2+, Mn2+, Cd2+, Ag+ and Pb2+. Regarding the reversibility of 1, the fluorescence and color of 1 in the presence of Hg2+ ion were found to be almost reversible when 1 was treated with EDTA solution. Furthermore, a study of the effect of pH on 1 with bound Hg2+ ion indicated that the fluorescence intensity and color change of 1 was almost constant between pH 4 and 10. This sensor has excellent selectivity and sensitivity over other metal ions and has detection limits below the maximum contamination level of 1.2 ppb for Hg2+ ion in drinking water, as defined by the U. S. Environmental Protection Agency (EPA). The results obtained not only allow a practical sensing application for the Hg2+ ion but also serve as a guide for the design of fluorimetric/colorimetric sensors for other targets.
%0 Journal Article
%1 Cho2010
%A Cho, Youngje
%A Lee, Shim S.
%A Jung, Jong H.
%D 2010
%I The Royal Society of Chemistry
%J Analyst
%K 6410 fluorescence sensing
%P 1551-1555
%R 10.1039/c0an00137f
%T Recyclable fluorimetric and colorimetric mercury-specific sensor using porphyrin-functionalized Au@SiO2 core/shell nanoparticles
%U http://dx.doi.org/10.1039/c0an00137f
%V 135
%X A fluorimetric/colorimetric mercury sensor based on Au@SiO2 core/shell nanoparticles has been developed and demonstrated. The porphyrin derivative (2) was attached to Au@SiO2 core/shell nanoparticles by covalent bonds and showed a red color and strong fluorescent properties. In the absence of specific metal ions, the porphyrin-functionalized Au@SiO2 nanoparticles (1) exhibited strong fluorescence emission and were red in color. The addition of Hg2+ ion to 1 resulted in a color change from red to green within 10 s and a weak display of fluorescence. Conversely, no significant changes in fluorescence emission or color were observed in the parallel experiments with Li+, Na+, Ca2+, Cu2+, Cd2+, Co2+, Mn2+, Cd2+, Ag+ and Pb2+. Regarding the reversibility of 1, the fluorescence and color of 1 in the presence of Hg2+ ion were found to be almost reversible when 1 was treated with EDTA solution. Furthermore, a study of the effect of pH on 1 with bound Hg2+ ion indicated that the fluorescence intensity and color change of 1 was almost constant between pH 4 and 10. This sensor has excellent selectivity and sensitivity over other metal ions and has detection limits below the maximum contamination level of 1.2 ppb for Hg2+ ion in drinking water, as defined by the U. S. Environmental Protection Agency (EPA). The results obtained not only allow a practical sensing application for the Hg2+ ion but also serve as a guide for the design of fluorimetric/colorimetric sensors for other targets.
@article{Cho2010,
abstract = {A fluorimetric/colorimetric mercury sensor based on Au@SiO2 core/shell nanoparticles has been developed and demonstrated. The porphyrin derivative (2) was attached to Au@SiO2 core/shell nanoparticles by covalent bonds and showed a red color and strong fluorescent properties. In the absence of specific metal ions, the porphyrin-functionalized Au@SiO2 nanoparticles (1) exhibited strong fluorescence emission and were red in color. The addition of Hg2+ ion to 1 resulted in a color change from red to green within 10 s and a weak display of fluorescence. Conversely, no significant changes in fluorescence emission or color were observed in the parallel experiments with Li+, Na+, Ca2+, Cu2+, Cd2+, Co2+, Mn2+, Cd2+, Ag+ and Pb2+. Regarding the reversibility of 1, the fluorescence and color of 1 in the presence of Hg2+ ion were found to be almost reversible when 1 was treated with EDTA solution. Furthermore, a study of the effect of pH on 1 with bound Hg2+ ion indicated that the fluorescence intensity and color change of 1 was almost constant between pH 4 and 10. This sensor has excellent selectivity and sensitivity over other metal ions and has detection limits below the maximum contamination level of 1.2 ppb for Hg2+ ion in drinking water, as defined by the U. S. Environmental Protection Agency (EPA). The results obtained not only allow a practical sensing application for the Hg2+ ion but also serve as a guide for the design of fluorimetric/colorimetric sensors for other targets.},
added-at = {2011-10-01T00:50:24.000+0200},
author = {Cho, Youngje and Lee, Shim S. and Jung, Jong H.},
biburl = {https://www.bibsonomy.org/bibtex/26c932bbf250c8d08375869a66969fd8b/afcallender},
citeulike-article-id = {7128684},
citeulike-linkout-0 = {http://dx.doi.org/10.1039/c0an00137f},
citeulike-linkout-1 = {http://www.rsc.org/Publishing/Journals/article.asp?doi=c0an00137f},
doi = {10.1039/c0an00137f},
file = {Cho2010.pdf:indexed\\Cho2010.pdf:PDF},
groups = {public},
interhash = {cf6430b55f7834663e9ec75362c56307},
intrahash = {6c932bbf250c8d08375869a66969fd8b},
journal = {Analyst},
keywords = {6410 fluorescence sensing},
pages = {1551-1555},
posted-at = {2010-05-05 13:33:56},
priority = {2},
publisher = {The Royal Society of Chemistry},
timestamp = {2011-10-01T00:50:24.000+0200},
title = {Recyclable fluorimetric and colorimetric mercury-specific sensor using porphyrin-functionalized Au@SiO2 core/shell nanoparticles},
url = {http://dx.doi.org/10.1039/c0an00137f},
username = {afcallender},
volume = 135,
year = 2010
}