β-Cyclodextrin-Incorporated MOFs for Ultrasensitive Photoelectrochemical Transistor Detection of Perfluorooctane Sulfonate in Real Sample from Mariculture Water Body

Perfluorooctane sulfonate (PFOS) constitutes a mounting global environmental crisis, the extensive application and exceptional chemical persistence of which have resulted in widespread contamination of water bodies and thus serious threats to human health. Currently, research on β-cyclodextrin (β-CD)-based strategies for PFOS detection has rapidly become a popular research topic. In this work, we report ultrasensitive PFOS detection of real sample from mariculture water body based on the synergy of β-CD-incorporated MOF (β-CD-MOF) with a graphene photoelectrochemical transistor (GPECT), a latest detecting technique with high sensitivity. The β-CD-MOF as the sensing module on the photogate allows selective PFOS recognition and the altered interfacial capacitance and charge-transfer resistance of GPECT. The practical applicability of the work is further confirmed by detecting PFOS in real sample from mariculture water body with a low detection limit of 0.48 fg mL−1, which is superior to many recently reported methods by two orders of magnitude.