Ammonium Ion Sensitive Electrode Based on the Extended gate Field Effect Transistor Structure

• Main Authors: Jun-Qi Wang, 王俊棋
• Other Authors: Shen-Kan Hsiung
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/2899as

碩士 === 中原大學 === 醫學工程研究所 === 91 === In blood the urea concentration can response the unusual absorption of the protein. The main product was the protein metabolism of the mammalian in the urea. And the more we ingest protein the more urea was produced. At the same time, it was also related to the renal function and the important parameter of the clinical diagnosis. In this study, the extended-gate field effect transistor of the SnO2/ITO glass was applied to fabricate the durable ammonium ion selective electrode and confer with the influence, including the different additive, added different polymer, the pH value, the concentration of the buffer solution…etc. After a series of the experiments, the optimized measurement environment of the ammonium ion selective electrode was in 0.5mM Tris/EDTA pH 7.5 and the best response curves can be gotten. The ammonium ion selective electrode structure can detect the ammonium ion concentration from 10-5 ~ 1M, and sensitivity of the linear range is about 47.64 mV/pNH . In addition, the ammonium ion selective electrode must emphasize the stability and reproducibility. The emphasis of the ion selective electrode also include the ion interference. Therefore, we must find out the optimize measurement environment to fabricate a stable ammonium ion selective electrode. After that, the long-term used electrode can be developed.