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由电聚合法用聚苯胺修饰碳纤维电极作为ＰＨ敏感电极。把Ｋ３Ｆｅ（ＣＮ）６／Ｋ４Ｆｅ（ＣＮ）６体系填入医用注射针头内成为参比电极。把经聚苯胺修饰的碳纤维电极安置入该针型参比电极内构成复合针型微ｐＨ传感器。在ＰＨ ２～１２范围内，该传感器呈现超Ｎｅｒｎｓｔ响应，斜率为－７８ ｍＶ／ｐＨ；响应时间<１ｍｉｎ。该传感器成功地应用于在体ｐＨ测定以及水果内微区ｐＨ测定。
Polyaniline-modified carbon fiber electrodes were used as PH-sensitive electrodes by electropolymerization. The K3Fe (CN) 6 / K4Fe (CN) 6 system was filled into the medical needle to become the reference electrode. The polyaniline modified carbon fiber electrode is placed in the needle reference electrode to form a composite needle micro-pH sensor. The sensor exhibits a super-Nernst response with a slope of -78 mV / pH in the pH range of 2 to 12; response time <1 min. The sensor has been successfully used in in vivo pH measurement and in-fruit microprobe determination.