新型微流通池pH－ISFET集成传感器

设计与制备了带Ｔｉ／Ａｕ膜参考电极的长臂式ｐＨ－ＩＳＦＥＴ集成传感器与微流通池。在静态和流动分析系统测量中表明：由蠕动泵驱动的待测液流动极畅，且试样量极少，响应速度快。     

Applicability of 0.05 mol kg potassium hydrogen phthalate as reference value pH standard in water–organic solvent mixtures

The applicability of 0.05 mol kg⁻¹ potassium hydrogen phthalate (KHPh(S), S=the solvent under study) as reference value pH standard (RVS) was studied in water–organic solvent mixtures. Phthalic acid in various aqueous organic solvent mixtures was titrated potentiometrically with Bu₄NOH (MeOH), using a pH-ISFET and a glass electrode as pH-sensors, and the buffer capacity of the HPh⁻ solution was roughly estimated from the difference between the first and second half-neutralization potentials. The influence of potassium ion to the buffer capacity was also studied, titrating KHPh and Et₄NHPh with CF₃SO₃H and Bu₄NOH (MeOH) and comparing the titration curves. The KHPh solution loses its buffer capacity if the solvent mixture has an aprotic property. For aqueous mixtures of protophilic aprotic solvents (e.g. DMSO and DMF), it is unsuitable as RVS if the water content is less than ca. 40 (v/v)%. The necessity of selecting subsidiary pH standard(s) is suggested for the solvent systems in which KHPh is inapplicable.     

采用离子注入方法调整和控制氢离子敏场效应管(pH-ISFET)阈值电压

本文首先分析了影响pH-ISFET阈值电压的几个因素.随后给出了在不同的离子注入参数下SOS型MISFET的阈值电压(V_T)_M及对应的参比电极-溶液-pH-ISFET的阈值电压(V_T)_R和△V_T=(V_T)_R-(V_T)_M的实测值曲线.最后对结果进行了讨论.