A photoelectrochemical sensor based on ??cyclodextrin?modified MoS ₂ quantum dots?WS ₂ nanosheet composites for the detection of benzo [a]pyrene

A photoelectrochemical sensor has been developed for the detection of polycyclic aromatic hydrocarbon pollutant benzo [a]pyrene (BaP). An n-butyl lithium intercalation stripping method is applied to prepare tungsten disulphide nanosheets (WS2 NSs). WS2 NSs and ?-cyclodextrin (?-CD)-modified MoS2 quantum dots (QDs) are then compounded by hydrogen bonding between amino hydroxyl groups. After assembly on an indium tin oxide electrode, energy level matching synergistic photoelectric effect ?-CD-MoS2 QDs reduced combination photogenerated electrons holes enhanced photocurrent signal observed. As a result host–guest interaction ?-CD BaP, BaP could bind in nanocomposites, which hinders electron migration electrode weakened signal. Thus, trace realized. The rate change also related concentration from 1 20 nmol/L with limit 0.33 nmol/L. In summary, highly sensitive selective successfully constructed.