Ultra-Sensitive Boscalid Sensors Based On A Beta-Cyclodextrin Modified Perfluorinated Copper Phthalocyanine Field-Effect Transistor

The increasing use of pesticides has raised concerns about the risks of exposure to pesticides. Rapid, simple and sensitive detection of pesticides is still a challenge in the current analytical technology. Herein, a perfluorinated copper phthalocyanine (F16CuPc) organic field-effect transistor (OFET) modified by beta-cyclodextrin (beta-CD) was used to detect boscalid molecules in solution. As a molecular carrier, beta-CD will capture boscalid to form an inclusion complex. The hydroxyl group in beta-CD and the carbonyl group in boscalid form a dipole-dipole interaction with F16CuPc, which induces more carriers in the device channel, which finally manifests as a significant increase in the maximum current of the device. When using beta-CD as the modification layer, the detection limit of the device can be as low as 2.40 x 10(-11) g L-1, which is 5 orders of magnitude lower than the internationally permitted MRL value.