Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/3848
標題: 多層壁奈米碳管/三氧化二鋁包覆二氧化矽奈米複合薄膜作為電化學感測器之探討
Electrochemical sensors based on multiwalled carbon nanotubes/alumina-coated silica nanoparticals composite
作者: 盧子蓉
Lu, Tzu-Lung
關鍵字: Carbon nanotube
奈米碳管
Electrochemical sensor
Square-wave voltammetry
電化學感測器
方波伏安法
出版社: 化學工程學系所
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摘要: 本研究成功的利用多層壁奈米碳管-三氧化二鋁包覆二氧化矽(MWNT-ACS)奈米複合薄膜修飾玻璃碳電極製備出電化學感測器偵測阿斯匹靈與乙醯胺酚。此MWNT-ACS奈米複合薄膜之分散均勻與否在本研究中以場發射電子顯微鏡觀察。可看出奈米碳管均勻的分散在MWNT-ACS奈米複合薄膜。第一部分利用循環伏安法與方波伏安法探討阿斯匹靈的電化學行為於MWNT-ACS奈米複合薄膜修飾電極。在循環伏安法中,與未修飾電極與奈米碳管修飾電極相較,奈米碳管有較小的氧化電位與較大的電流訊號。顯示奈米碳管有良好的電催化行為。利用方波伏安法偵測阿斯匹靈,有不錯的電化學效能參數:靈敏度81.4 A M-1 cm-2,偵測極限 3.77 μM。MWNT-ACS奈米複合薄膜修飾電極於市售真實樣品之偵測亦有不錯的效果。 在第二部分乙醯胺酚的感測研究中,同樣以循環伏安法與方波伏安法探討乙醯胺酚的電化學行為於MWNT-ACS奈米複合薄膜修飾電極。由於奈米碳管的電催化性質與高表面積,碳管修飾電極擁有較小的氧化電位與高氧化還原電流訊號。以方波伏安法進行測試,發現以MWNT-ACS修飾GCE之工作電極在對乙醯胺酚偵測,可以得到很高的靈敏度。效能參數分別為靈敏度376.5 A M-1 cm-2,偵測極限0.05 µM。接著針對市售藥品之乙醯胺酚含量做偵測,發現偵測值與商標值接近,表示此電極能有效的應用於市售樣品之測量。
A high sensitive electrochemical sensor based on a multiwalled carbon nanotube-alumina-coated silica (MWNT-ACS) nanocomposite modified glassy carbon electrode was applied to the determination of acetaminophen and aspirin. The morphology of the MWNT-ACS nanocomposite was characterized by field emission scanning electron microscopy. MWNTs were well dispersed in the MWNT-ACS nanocomposite. The first part is the introduction of electrochemical behavior of aspirin by using MWNTs-ACS nanocomposite modified glassy carbon electrode with cyclic voltammetry and square-wave voltammetry. In cyclic voltammetric responses, the enhanced current response and the lower oxidation potential were obvious evidences for the electrocatalytic ability of MWNTs toward ASA oxidation. The anodic peak currents varied linearly with the square root of scan rates over the range of 0.025-0.3 V s-1, which suggested a diffusion-controlled process for the electrochemical reaction. The determination of ASA at the MWNT-ACS nanocomposite modified glassy carbon electrode with square-wave voltammetry displayed a high sensitivity of 81.4 A M-1 cm-2 and a low detection limit of 3.77 μM (S/N = 3). The proposed methodology was successfully applied to the detection of ASA in pharmaceutical drugs with satisfactory results. The second part of this study is to detect acetaminophen based on MWNT-ACS nanocomposite modified glassy carbon electrode. Electrocatalytic behavior of the MWNT-ACS nanocomposite modified glassy carbon electrode was investigated using cyclic voltammetry and square-wave voltammetry. Compared to an unmodified glassy carbon electrode, the MWNT-ACS modified glassy carbon electrode exhibited low oxidation potential and enhanced peak current for the redox reaction of acetaminophen. The sensitivity was estimated to be 376.5 A M-1 cm-2 and the detection limit was found to be 0.05 μM using square-wave voltammetry. The commercial samples were detected by the proposed method with satisfactory results.
URI: http://hdl.handle.net/11455/3848
其他識別: U0005-2806201011151500
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2806201011151500
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