隨著現代人的飲食習慣以及生活品質的改善，逐漸出現一些常見的病症，更甚者有可能會對人生命造成很大的疑慮，腎衰竭也是其中之一，現行腎衰竭患者嚴重者需固定進行洗腎以維持基本生命需要，但有效控制血鉀離子就可以更有效的控制洗腎次數，可有效降低醫療支出，並使病患能花費更少時間金錢在這部份的開銷；普魯士藍 (Prussian blue) 是一種特殊的化學組成物，具有針對於一價離子的良好吸引力，本實驗以電沉積法在電極上修飾一層普魯士藍薄膜，在給予特殊啟動電壓，便可以使其抓取一價離子的能力大幅提升，故可以將其應用為特殊辨識元件，如此製作出來的電極就可以使用在FET上，在鈉鉀離子被抓取後，造成表面電荷的改變，來使得FET輸出的電流產生變化，以此反推得溶液中離子濃度，在完成驗證後，接著量測不同濃度的氯化鉀 (KCl) 及氯化鈉 (NaCl) 並建立資料庫，以及濃度曲線。

With the improvement of life quality in modern society, it comes with some common diseases. Kidney failure is one of the risky diseases. Nowadays, kidney failure patients need to take a regular dialysis treatment in order to extend their lives. However, through controlling the times of dialysis treatment by the potassium concentration in blood can reduce medical expenses effectively, by which patients could save both money and time, which is more efficient.
Prussian blue is a special chemical composition; it has good affinity for mono-ion. In this research, we use electrical deposition method to coat Prussian blue membrane on the surface of electrode. When we input specific starting voltage to the membrane, its ability to capture mono-ion increase notably. That’s the reason we apply this unique characteristic in this research. In our system, Prussian blue is the recognition element. The electrode with Prussian blue membrane can use in the field effect transistor system. After potassium and sodium ion been captured, it caused the surface charge change. Currents between source and drain will change as well. By calculating the changes of current, ion concentration in solution can be found. Finally, both potassium and sodium concertation’s database and the concentration dependent curve of the research were built up.

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