A novel ionic liquid stabilized molecularly imprinted optosensing material based on quantum dots and graphene oxide...

This work prepared a novel ionic liquid stabilized molecularly imprinted optosensing material based on quantum dots (QDs) and graphene oxide (GO) composites using a one-step polymerization for highly selective and sensitive specific recognition of vitamin E (VE). Here, GO was first introduced to the molecularly imprinted polymer (MIP) because of its ultra-high specific surface area which increases the rate of mass-transfer relative to that of traditional bulk MIP. The ionic liquid was used to provide the desired surface binding groups between the QDs and the GO, but also to improve their fluorescence stability by virtue of its high thermal and chemical stability. Under optimal conditions, the relative fluorescence intensity of MIP decreased linearly with the increasing concentration of VE in the range of 2.30×10(-2)-9.20×10(2)μM with a detection limit of 3.5nM and the precision for five replicate detections of 92μM VE was 1.67% (relative standard deviation). At three concentration levels, the recoveries for two samples achieved were 93.00-100.14% and 92.00-102.00%, respectively.