期刊
JOURNAL OF LUMINESCENCE
卷 192, 期 -, 页码 547-554出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2017.07.018
关键词
AIZS quantum dots; Fluorescence; DTAB; Sensors; Copper(II)
类别
资金
- Key Research and Development Project of Ministry of Science and Technology [2016YFC0801200]
- Natural Science Foundation of China [61635004, 61475028, 61575190, 61575033]
- Chongqing Outstanding Youth Project [cstc2014jcyjjq40002]
- Project of Natural Science Foundation of Chongqing [cstc2013jcyjA40029]
- Fundamental Research Funds for the Central Universities [106112015CDJXY120010]
In this study, a facile and effective method based on mini-emulsion/solvent evaporation technique was designed to synthesize water-soluble zinc-doped AgInS2 (AIZS) quantum dots stabilized by dodecyltrimethylammonium bromide (DTAB). Subsequently, the as-synthesized nanocomposites were successfully used as sensitive and selective fluorescence nanoprobe for copper(II) detection. Fluorescence of the cadmium-free AIZS-DTAB QDs could be significantly quenched upon the addition of copper(II), and the quenching degree (I-o/I) was proportionally linear with copper(II) concentration ranging from 0.05 to 10 mu M with a low detection limitation of 15 nM. The quenching mechanism was found to be due to electron transfer mechanism as confirmed by X-ray photoelectron spectroscopy (XPS) measurements. This nano-probe shows good selectivity toward copper(II) in aqueous solution with a quick response of 1 min, offering great potential to determine the copper(II) concentration in drinking water and natural water resources.
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