Folic acid functionalized silver nanoparticles with sensitivity and selectivity colorimetric and fluorescent detection for Hg 2+ and efficient catalysis

In this research, folic acid functionalized silver nanoparticles (FA-AgNPs) were selected as a colorimetric and a ‘turn on’ fluorescent sensor for detecting Hg 2+ . After being added into Hg 2+ , AgNPs can emit stable fluorescence at 440 nm when the excitation wavelength is selected at 275 nm. The absorbance and fluorescence of the FA-AgNPs could reflect the concentration of the Hg 2+ ions. Thus, we developed a simple, sensitive analytical method to detect Hg 2+ based on the colorimetric and fluorescence enhancement of FA-AgNPs. The sensor exhibits two linear response ranges between absorbance and fluorescence intensity with Hg 2+ concentration, respectively. Meanwhile, a detection limit of 1 nM is estimated based on the linear relationship between responses with a concentration of Hg 2+ . The high specificity of Hg 2+ with FA-AgNPs interactions provided the excellent selectivity towards detecting Hg 2+ ...

Dongyue Su, Xin Yang, Qingdong Xia, Qi Zhang, Fang Chai, Chungang Wang and Fengyu Qu

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