Ultrasound‐assisted reverse micelle synthesis of Eu-MOF as a turn-off luminescent sensor for the ultrasensitive and selective detection of caffeine

In this work, Europium-metal organic framework (Eu-MOF) was successfully fabricated via an efficient and rapid ultrasound-assisted reverse micelle method. The as-synthesized Eu-MOF served as a fluorescence sensor to detection of caffeine via a fluorescent quenching mechanism. The effect of detection parameters including pH, incubation time, and temperature on the fluorescence detection of caffeine were studied by response surface methodology (RSM). The developed fluorescence sensor exhibited excellent sensitivity and selectivity for the detection of caffeine with a good linear relationship and limit of detection (LOD) of 0.0316 μM. The proposed system was used for the detection of caffeine in real samples and exhibited high accuracy and precision with recoveries ranging from 96.40 to 103.20% and relative standard deviations (RSD) of 2.04 to 4.43%. The highly sensitive and selective detection of as-synthesized, Eu-MOF which was synthesized by efficient and rapid ultrasound-assisted reverse micelle procedure, may make it a potential luminescent sensor in the future.