A series of emission "turn-on" probes derived from rhodamine for Hg(II) recognition and sensing: Synthesis, characterization and performance

作者：Wan Dajuan; Li Yan-xia; Zhu Peijuan^*

来源：Sensors and Actuators B: Chemical , 2015, 221: 1271-1278.

DOI：10.1016/j.snb.2015.07.109

• Hg(II) detection
• Up-conversion nanoparticles
• Sensor
• Rhodamine derivative

This paper reported six rhodamine derived chemosensors for Hg(II) sensing, hoping to improve sensitivity of environmental Hg(II) monitoring. Up-conversion beta-NaYF4:Yb3+/Er3+ nanocrystals were synthesized and used as an excitation host so that these chemosensors could be excited by near-IR laser radiation (980 nm). Emission of this excitation host overlapped well with absorption of these chemosensors, resulting in an efficient energy transfer which was confirmed by emission decay lifetime analysis. Sensing mechanism of these chemosensors was found as a complexing one with binding stoichiometry of 1:1. Host:chemosensor systems in buffer solution showed emission "turn-on" effect toward Hg(II) with good selectivity. Linear response was obtained. The correlation between sensing performance and chemosensor structure was discussed as well. It was found that S substituent in these chemosensors increased sensitivity and selectivity, but decreased photostability.

• 出版日期2015-12-31
• 单位湖南师范大学