A Ratiometric Fluorescence Probe of Dopamine-Functionalized Carbon Nanodots for Hypochlorite Detection

A dopamine-functionalized carbon nanodot (C-dots) ratiometric fluorescence probe for hypochlorite (ClO−) detection is reported. Fluorescent C-dots with maximal emission at 420 nm are synthesized via the hydrothermal synthesis of 3-hydroxyphenylboric acid 160 °C 8 h. After modified dopamine 5 min, obtained exhibit two emissions and 460 nm. intensity gets quenched addition ClO− fluorescent almost unaffected. Therefore can be used as highly sensitive ClO−. The ratio (I460nm/I420nm) has a linear relationship concentration from 2 μM to 60 limit (LOD) 0.6 μM. It shows high selectivity toward other anions (SO42−, Cl−, NO3−, S2−, CO32−), metal ions (Mg2+, Ba2+, Ag+, Fe3+, Ca2+, Na+, Cr6+, Cr3+, Hg+), or substances such H2O2, glutamate, cysteine, citric acid. When it utilized in tap water, average recoveries 95.7% 103.2% relative standard deviations (RSDs) lower than 5%.