Black phosphorus quantum dots sensitized lucigenin chemiluminescence in mild alkaline condition and its application in sensitive detection of Co2+

摘要

As a novel 2-dimensional nanomaterials, black phosphorus quantum dots (BPQDs) have attracted many interests in recent years. In the present work, the potential application of BPQDs in lucigenin chemiluminescence (CL) was researched. Under mild alkaline condition, lucigenin CL was extremely weak, and was difficult for analytical application. Both BPQDs and Co2+ exhibited enhancing effect on lucigenin CL due to their catalytic effects. The synergic effect of BPQDs and Co2+ could generate the strongest CL emission in weak alkaline solution, which provided the possibility for higher sensitive detection of Co2+. Several impacting factors, such as the concentrations of lucigenin and H2O2, the pH value, the mixing sequence of reagents, and the diluted ratio of BPQDs were investigated. Under the optimal condition, Co2+ was sensitively detected in the range of 8.0 x 10(-9) to 8.0 x 10(-8) mol L-1, and the detection limit was determined as 3.0 x 10(-9) mol L-1 (3 sigma). The proposed method exhibited higher sensitivity, wider linear range, and good selectivity compared with traditional CL method. Finally, the mechanism for BPQDs sensitized lucigenin CL was discussed.