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標題: | 平面式離子選擇電極研究與水耕養液巨量元素感測應用 Study of planar ion selective electrodes and macro-element sensing for hydroponics |
作者: | Chien-Wen Yao 姚傑文 |
指導教授: | 陳林祈 |
關鍵字: | 離子選擇電極,接觸層,導電高分子,奈米碳管,水耕栽培, ion selective electrode,contact layer,conducting polymer,carbon nanotubes,water cultivate, |
出版年 : | 2014 |
學位: | 碩士 |
摘要: | 植物工廠中植物的栽培主要是以水耕為主,因為其具有能使作物生長離開土壤,避免地力損失、連作障礙等弊病,利於生長過程的自動化,同時營養液可以循環使用的優勢。然而水耕作物的營養大多來自於水耕養液中的各成份離子濃度,在生長過程中各離子的成份消長不易監控,且傳統的固態離子選擇電極又有離子與電子訊號轉換上的限制,故在本論文中製造平面式的固態離子選擇電極輔以一接觸層的結構用以解決訊號傳遞問題並將其應用在植物工廠的水耕養液分析上。此外固態離子選擇電極的水層效應亦是需要克服的問題,因此本論文使用五種不同的導電材料做為選擇膜以及導電基材之間的接觸層,其中包括氨基修飾的多層奈米碳管、酯類修飾的多層奈米碳管、聚吡咯、聚噻吩以及聚鄰氨基酚。由循環伏安法(電容提升約4.5倍,相較於無接觸層)、電化學阻抗分析法(電容提升約7倍,電阻減少四分之一,相較於無接觸層)以及計時電位法(電容提升約4.33倍,電阻減少77%,相較於無接觸層)的結果以及再現性的評估,發現到聚鄰氨基酚具有極佳的高電容以及低電阻的特性,有助於感測時離子與電子間的訊號傳遞,此外其疏水的結構(接觸角增加11.2度)亦可避免水層所帶來的電壓不穩定性。
而在電極製作部分,本論文使用開路電位法量測鉀離子、鈣離子、銨根、硝酸根、鎂離子這五種離子感測電極的靈敏度,分別是55.0mV/decade、26.7 mV/decade、55.8 mV/decade、55.3 mV/decade、26.1 mV/decade。同時,這些電極的偵測極限也分別在7.2 The main cultivation in a plant factory is hydroponics owing to its advantages of no soil needed, avoiding the loss of soil fertility and continuous cropping obstacle. Also, the productions of the plant growth are automatic and the nutrient can be recycled. However, the ion concentrations are difficult to monitor during the plant cultivation. Besides, the traditional solid-state ion selective electrodes are limited by the ion-to-electron transduction. Hence, we would manufacture the planar solid-state ion selective electrodes with a contact layer in order to overcome the signal issue and ap-ply it to monitor the nutrient. In this thesis, we utilized five conducting materials in-cluding multi walled carbon nanotubes modified NH2, multi walled carbon nanotubes modified ester, polypyrrole, polythiophene and poly-o-aminophenol as a contact layer between ion selective membrane and conducting substrate. By cyclic voltammetry(the capacitance enhanced 4.5 times comparing to the electrode without the contact layer), electrochemical impedance spectroscopy(the capacitance increased 7 times and the resistance decreased around one forth than the electrode without the contact layer), chronopotentiometry (the capacitance increased 4.33 times and the resistance de-creased around 77% than the electrode without the contact layer) and reproductively, poly-o-aminophenol have the best performance to enlarge the capacitance and reduce the resistance of the ion sensor. Moreover, its hydrophobic structure (contact angle increased 11.2 degrees) avoids the potential instability resulting from water layer. In the ion selective electrode part, the sensitivities of potassium, calcium, ammonium, nitrate and magnesium ISEs are 55.0mV/decade、26.7 mV/decade、55.8 mV/decade、55.3 mV/decade、26.1 mV/decade, respectively by measuring their open circuit po-tentials. Furthermore, the detection limits of those electrodes are7.2 |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/16922 |
全文授權: | 未授權 |
顯示於系所單位: | 生物機電工程學系 |
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