Ultrasensitive quantum dot fluorescence quenching assay for selective detection of mercury ions in drinking water
Mercury is one of the most acutely toxic substances at trace level to human health and living thing. Developing a rapid, cheap and water soluble metal sensor for detecting mercury ions at ppb level remains a challenge. Herein, a metal sensor consisting of MPA coated Mn doped ZnSe/ZnS colloidal nanop...
| Main Authors: | , , , , |
|---|---|
| Format: | Journal Article |
| Published: |
Nature Publishing Group
2014
|
| Online Access: | http://hdl.handle.net/20.500.11937/36304 |
| _version_ | 1848754731680268288 |
|---|---|
| author | Ke, J. Li, Xin Yong Zhao, Q. Hou, Y. Chen, J. |
| author_facet | Ke, J. Li, Xin Yong Zhao, Q. Hou, Y. Chen, J. |
| author_sort | Ke, J. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Mercury is one of the most acutely toxic substances at trace level to human health and living thing. Developing a rapid, cheap and water soluble metal sensor for detecting mercury ions at ppb level remains a challenge. Herein, a metal sensor consisting of MPA coated Mn doped ZnSe/ZnS colloidal nanoparticles was utilized to ultrasensitively and selectively detect Hg 2+ ions with a low detection limit (0.1 nM) over a dynamic range from 0 to 20 nM. According to strong interaction between thiol(s) and mercury ions, mercaptopropionic acid (MPA) was used as a highly unique acceptor for mercury ions in the as-obtained ultrasensitive sensor. In the presence of mercury ions, colloidal nanoparticles rapidly agglomerated due to changes of surface chemical properties, which results in severe quenching of fluorescent intensity. Meanwhile, we find that the original ligands are separated from the surface of colloidal nanoparticles involving strongly chelation between mercury ion and thiol(s) proved by controlled IR analysis. The result shows that the QD-based metal ions sensor possesses satisfactory precision, high sensitivity and selectivity, and could be applied for the quantification analysis of real samples. |
| first_indexed | 2025-11-14T08:45:04Z |
| format | Journal Article |
| id | curtin-20.500.11937-36304 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:45:04Z |
| publishDate | 2014 |
| publisher | Nature Publishing Group |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-363042017-09-13T15:24:46Z Ultrasensitive quantum dot fluorescence quenching assay for selective detection of mercury ions in drinking water Ke, J. Li, Xin Yong Zhao, Q. Hou, Y. Chen, J. Mercury is one of the most acutely toxic substances at trace level to human health and living thing. Developing a rapid, cheap and water soluble metal sensor for detecting mercury ions at ppb level remains a challenge. Herein, a metal sensor consisting of MPA coated Mn doped ZnSe/ZnS colloidal nanoparticles was utilized to ultrasensitively and selectively detect Hg 2+ ions with a low detection limit (0.1 nM) over a dynamic range from 0 to 20 nM. According to strong interaction between thiol(s) and mercury ions, mercaptopropionic acid (MPA) was used as a highly unique acceptor for mercury ions in the as-obtained ultrasensitive sensor. In the presence of mercury ions, colloidal nanoparticles rapidly agglomerated due to changes of surface chemical properties, which results in severe quenching of fluorescent intensity. Meanwhile, we find that the original ligands are separated from the surface of colloidal nanoparticles involving strongly chelation between mercury ion and thiol(s) proved by controlled IR analysis. The result shows that the QD-based metal ions sensor possesses satisfactory precision, high sensitivity and selectivity, and could be applied for the quantification analysis of real samples. 2014 Journal Article http://hdl.handle.net/20.500.11937/36304 10.1038/srep05624 Nature Publishing Group unknown |
| spellingShingle | Ke, J. Li, Xin Yong Zhao, Q. Hou, Y. Chen, J. Ultrasensitive quantum dot fluorescence quenching assay for selective detection of mercury ions in drinking water |
| title | Ultrasensitive quantum dot fluorescence quenching assay for selective detection of mercury ions in drinking water |
| title_full | Ultrasensitive quantum dot fluorescence quenching assay for selective detection of mercury ions in drinking water |
| title_fullStr | Ultrasensitive quantum dot fluorescence quenching assay for selective detection of mercury ions in drinking water |
| title_full_unstemmed | Ultrasensitive quantum dot fluorescence quenching assay for selective detection of mercury ions in drinking water |
| title_short | Ultrasensitive quantum dot fluorescence quenching assay for selective detection of mercury ions in drinking water |
| title_sort | ultrasensitive quantum dot fluorescence quenching assay for selective detection of mercury ions in drinking water |
| url | http://hdl.handle.net/20.500.11937/36304 |