MoS2-QD-Based Dual-Model Photoluminescence Sensing Platform for Effective Determination of Al~(3+) and Fe~(3+) Simultaneously in Various Environment

摘要

The development of a sensitive sensing platform with multiple ions recognition ability in various environment is of great importance. In this paper, cysteine-functionalized MoS2 quantum dots (Cys-MoS2 QDs) with stable fluorescence are synthesized by a simple amidation reaction. The resultant Cys-MoS2 QDs show good dispersion in aqueous solution and blue emission (λem= 428 nm) with a quantum yield (~5%). The Cys- MoS2 QDs drastically have improved the surface chemical reactivities, which exhibit sensitive and selective “turn-on” response to Al~(3+) and “turn-off” response to Fe~(3+) simultaneously. Furthermore, we testify the feasibility of applying this fluorescent probe for real sample analysis through the detection of Al~(3+) and Fe~(3+) ions in lake water and tap water. Moreover, using HeLa cells as the model, the resultant nanosensor is demonstrated to monitor Al~(3+) and Fe~(3+) ions in living cells. Thus, resultant Cys-MoS2 QDs could be used as a “turnon” and “turn-off” dual-model photoluminescence sensing platform for effective determination of Al~(3+) and Fe~(3+) simultaneously in various environment.