期刊
JOURNAL OF LUMINESCENCE
卷 145, 期 -, 页码 364-370出版社
ELSEVIER
DOI: 10.1016/j.jlumin.2013.07.021
关键词
Hg(II); Upconversion nanobars; Sensor; Rhodamine derivative
类别
资金
- Ministry of National Foundation of China for Young Scholars [9140C0905040706]
In this paper, we reported an off-on optical sensor for Hg(II) detection using upconversion beta-NaYF4:Yb3+/Er3+ nanobars as the excitation source and a rhodamine derivative as the probe. The nanocomposite was characterized and studied by electron microscopy, XRD analysis, IR spectra, thermogravimetty and photophysical measurements. The energy transfer mechanism between the upconversion excitation source and the rhodamine based probe was analyzed by their emission/excitation spectra and excited state lifetime comparison. Experimental results suggested that the upconversion emission form the excitation source could effectively excite the probe. The sensing performance of the nanocomposite towards Hg(II) was also studied. It was found that the emission intensity of the nanocomposite increased with the increasing Hg(II) concentration, showing an off-on phenomenon. In addition, the emission signal of the nanocomposite was immune to other metal ions, providing a high selectivity towards Hg(II). (C) 2013 Elsevier B.V. All rights reserved.
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