Song Kai, Mo Jingang, Lu Chengwen
School of Life Science, Changchun Normal University, Changchun 130032, China.
School of Life Science, Changchun Normal University, Changchun 130032, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2017 May 15;179:125-131. doi: 10.1016/j.saa.2017.02.034. Epub 2017 Feb 20.
This paper reported two nanocomposite sensing platforms for Hg(II) detection with improved photostability, using two rhodamine derivatives as chemosensors and up-conversion nanocrystals as excitation host, respectively. There existed a secondary energy transfer from this excitation host to these chemosensors, which was confirmed by spectral analysis, energy transfer radius calculation and emission decay lifetime comparison. In this case, chemosensor photostability was greatly improved. Further analysis suggested that these chemosensors recognized Hg(II) following a simple binding stoichiometry of 1:1. Hg(II) sensing performance of these sensing platforms was analyzed through their emission spectra upon various Hg(II) concentrations. Emission spectral response, Stern-Volmer equation, emission stability and sensing selectivity were discussed in detail. It was finally concluded that these chemosensors showed emission turn on effect towards Hg(II), with high photostability, good selectivity and linear response.
本文报道了两种用于汞（II）检测的纳米复合传感平台，它们分别使用两种罗丹明衍生物作为化学传感器、上转换纳米晶体作为激发主体，从而具有更高的光稳定性。从激发主体到这些化学传感器存在二次能量转移，这通过光谱分析、能量转移半径计算和发射衰减寿命比较得到了证实。在这种情况下，化学传感器的光稳定性得到了极大提高。进一步分析表明，这些化学传感器以简单的1:1结合化学计量比识别汞（II）。通过这些传感平台在不同汞（II）浓度下的发射光谱分析了它们对汞（II）的传感性能。详细讨论了发射光谱响应、斯特恩-沃尔默方程、发射稳定性和传感选择性。最终得出结论，这些化学传感器对汞（II）表现出发射开启效应，具有高光稳定性、良好的选择性和线性响应。
