聚苯胺修饰碳纤维针型复合微pH传感器  

A Micro Needle-Concentric pH Sensor Based on Polyaniline-Modified Carbon Fibre

作　　者：蔡沛祥[1] 张润建[1] 朱芳[1] 邱灿辉 

机构地区：[1]中山大学化学系,广州510275

出　　处：《分析化学》1997年第11期1250-1254,共5页Chinese Journal of Analytical Chemistry

摘　　要：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。A Carbon fibre electrode modified with polyaniline by electro-polymerization was prepared to work as pH-sensitive electrode. A syringe needle filled with K3Fe(CN )6/ K4Fe(CN)6 redox system was used as reference electrode. The micro needle-concentric pH sensor was constructed by inserting the polyaniline-modified carbon fibre electrode in the needle reference electrode obtained above. The sensor shows a over-Nernst response in the pH range of 2-12 with a slope of -78 mV/pH and a response time of less than 1 min. The sensor has been successfully employed to determine pH in vivo and in micro region of fruit.

关 键 词：针型复合 PH传感器 聚苯胺 碳纤维微电极 

分 类 号：O657.1[理学—分析化学]