Size and shape controlled synthesis of aqueous silver nanoparticles and a comparative study of their fluorescence and electrochemical responses towards cholesterol


ABSTRACT:

Five samples of aqueous silver nanoparticles (samples A-E) were synthesized by reducing AgNO3 by NaBH4 in the presence of poly (vinyl pyrrolidone) (PVP) and sodium citrate. By varying the amount of the stabilizer PVP during synthesis process we get all the five samples of different morphology. We have characterized these samples by TEM, UV-Visible spectroscopy and fluorescence spectroscopy. The fluorescence and electrochemical interactions of these samples towards cholesterol have shown that all the samples behave differently towards cholesterol. By comparing their behaviors towards cholesterol it can be concluded that in future sample A whose fluorescence intensity (λex=250 nm; λemi= 220-500 nm; λmax = 341 nm) enhances 4.3 times of its initial value on interaction with cholesterol can be used as a good fluorescence probe and sample C whose redox potential suffers 148 mV –ve shift in presence of cholesterol can be used as a good electrochemical probe for the detection of cholesterol in solution.


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