کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5400214 | 1505915 | 2014 | 8 صفحه PDF | دانلود رایگان |

- A Hg(II) sensing system owing high accuracy and good selectivity was reported.
- An up-conversion host of β-NaYF4:Yb3+/Er3+ served as the excitation core.
- A rhodamine-based probe was grafted onto the surface of the excitation source.
- The fluorescence enhancement effect could be activated only by Hg(II).
In this work, a rhodamine derivative was synthesized and grafted onto the surface of an up-conversion host of β-NaYF4:Yb3+/Er3+, resulting in a Hg(II)-sensing system. The obtained nanocomposite was fully characterized and studied by electron microscopy images, wide-angle XRD diffraction patterns, IR spectra and thermogravimetry, which confirmed the successful construction of the nanocomposite. The analysis on absorption and emission spectra suggested that the up-conversion host could efficiently excite the probe, which was later proved by the emission decay characteristics. The sensing performance of the nanocomposite towards Hg(II) was studied by steady emission spectra. It was found that the fluorescence from the probe increased with the increasing Hg(II) concentration, showing an “off-on” effect. In addition, the fluorescence enhancement effect could be activated only by Hg(II), suggesting that the nanocomposite owned a high selectivity towards Hg(II).
Journal: Journal of Luminescence - Volume 145, January 2014, Pages 539-546