A fluorescence sensor based on BSA modified sulfur nanosheets for sequential detection Fe3+ and salicylic acid

Abstract

Sulfur nanosheets (S-NSs) have received increasing attention in biochemistry fielded due to adequate inherent antibacterial, antifungal activities, outstanding stability and reusability. The electron transfer between the iron ions (Fe3+) and S-NSs brings S-NSs aggregation lead to the fluorescence intensity of S-NSs decreases in a wide linear concentration range from 12 to 108 μM. More interestingly, the quenched fluorescence of S-NSs/Fe3+ could be recovered by salicylic acid (SA) in a linear range of 8–80 μM because of a stable complex could be form between SA and Fe3+and the proposed sensor for SA showed the outstanding advantages of simplicity, specificity, and fast. The method included environmentally friendly, low-cost, convenient, and wide linear range, which makes it a novel method for routine applications for Fe3+ and SA detection.