An "off-on" fluorescence probe for Hg(II) detection using upconversion nanobars as the excitation source: Preparation, characterization and sensing performance
An "off-on" fluorescence probe for Hg(II) detection using upconversion nanobars as the excitation source: Preparation, characterization and sensing performance
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DOI：
10.1016/j.jlumin.2013.07.021
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发表时间：
2014-01-01
影响因子：
3.6
通讯作者：
Zhang, He Ming
中科院分区：
文献类型：
--
作者：
Cui, Xiao;Zhang, He Ming
在本文中，我们报告了一个“关-开”的光学传感器，用于Hg（II）的检测，使用上转换beta-NaYF 4：Yb 3 +/Er 3+纳米棒作为激发源和罗丹明衍生物作为探针。通过电子显微镜、X射线衍射分析、红外光谱、热重分析和水热物理测试对纳米复合材料进行了表征和研究。通过发射/激发光谱和激发态寿命的比较，分析了上转换激发源和罗丹明基探针之间的能量传递机制。实验结果表明，激发源的上转换发射可以有效地激发探针。研究了纳米复合材料对Hg（II）的传感性能。结果发现，纳米复合材料的发光强度增加与Hg（II）浓度的增加，显示出“关”的现象。此外，纳米复合材料的发射信号对其他金属离子免疫，对Hg（II）具有高选择性。(C)2013爱思唯尔有限公司版权所有。
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.