Dopamine dithiocarbamate functionalized silver nanoparticles as coiorimetric sensors for the detection of cobalt ion

摘要

A coiorimetric assay has been developed for facile, rapid and sensitive detection of Co~(2+) using dopamine dithiocarbamate functionalized silver nanoparticles (DDTC-Ag NPs) as a coiorimetric sensor based on unique surface plasmon resonance properties. The presence of Co~(2+) induces the aggregation of Ag NPs through coordinate covalent bonds between the catechol groups of DDTC on the surface of Ag NPs and cobalt ions, resulting in a color change from bright yellow to reddish. These color changes are measured by UV-vis spectrophotometry, and can be directly read out with the naked eye.