A ratio-metric fluorescent sensing system based on CdTe@ZIF-8 nanocomposites for the visual detection of tetracycline
In this experiment,CdTe@ZIF-8 nanocomposites were prepared by introducing CdTe quantum dots with red fluorescence into the synthesis system of ZIF-8,and used as fluorescent probes to construct ratio-metric fluorescent sensing system for the detection of tetracycline.Due to the loading of CdTe quantum dots,the nanocomposites exhibit red fluorescence emission at 640 nm.In the presence of tetracycline,a newly generated green fluorescence emission at 520 nm of the nanocomposites could be observed.As the concentration of tetracycline increased,the green emission at 520 nm gradually increased,while the red emission at 640 nm gradually decreased.In addition,the ratio of the two emission peaks(I520/I640)showed a good linear relationship with the concentration of tetracycline.Therefore,the quantitative detection of tetracycline could be realized by monitoring the value of I520/I640.Moreover,under the irradiation of a 365 nm handheld UV lamp,the fluorescence color of the system changed from red through orange and yellow to green as the tetracycline concentration increased,which could be distinguished by the naked eye,leading to the visual detection of tetracycline.
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