▎ 摘　　要

In this study, the graphene ion-sensitive field-effect transistor in an electrolyte solution with different K+ concentration has been investigated. It is found that by measuring the gate voltage changes, the K+ concentration in the electrolyte can be determined because of the interaction between the K+ ions and the gate. For prediction purpose, the artificial neural network has been employed to predict the I-V characteristic, and it demonstrated superior performance.