Si_3N_4离子敏感场效应晶体管被作为一种特殊的电化学体系来进行研究。与传统的电极不同,它的状态不是由电位来决定,而是由源漏电流I_o来表征。由于在Si_3N_4表面不存在氧化还原反应,因此它是典型的理想极化电极。随着源漏电流I_(?)的不同,在不同的电解液体系里,具有不同的V_g响应。本文以Si_3N_4离子敏感场效应管的V_s—I_D的稳态特性曲线来研究各种不同溶液的pH响应。 Si_3N_4 ion-sensitive field-effect transistor is studied as a special electrochemical system. Unlike traditional electrodes, its state is not determined by the potential, but by the source and drain current I_o to characterize. Because there is no redox reaction on the surface of Si_3N_4, it is a typical ideal polarized electrode. With the different source-drain current I_ (?), Different V_g responses in different electrolyte systems. In this paper, Si_3N_4 ion-sensitive field-effect transistor V_s-I_D steady-state characteristics of the various solutions to study the pH response.