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標題: 高表面積化銅電極的製作與在電化學感測器的應用
Fabrication of High Surface-area Copper Electrodes for the Application of Electrochemical Sensors
作者: 江權庭
Jiang, Chiuan-Ting
Contributors: 吳靖宙 博士
Ching-Chou Wu
生物產業機電工程學系所
關鍵字: 氫氧化銅;磷酸銅;銅電極;奈米結構
Cu(OH)2;Cu3(PO4)2.2H2O;copper electrode;nanostructure
日期: 2012
Issue Date: 2013-11-18 11:00:56 (UTC+8)
Publisher: 生物產業機電工程學系所
摘要: 在商業化的感測器發展中,如何減少電極製作成本以及提高靈敏度降低檢測極限變成了現今生物感測器的重要趨勢。本研究中,我們開發製作高表面積化銅電極的方法,在50oC 1 M NaOH中施予-0.181 V電位可穩定製作出長約2.84 ± 0.31 μm針狀結構的Cu(OH)2,由於Cu(OH)2導電性差,此電極無法產生明顯氧化還原反應。因此實驗中利用不同pH值的100 mM Na2HPO4溶液對Cu(OH)2結構進行改質,發現在pH 5.0-7.0的100 mM Na2HPO4溶液中,可進行Cu(OH)2的溶解與產生Cu3(PO2)2.2H2O的再沉積,且在pH 5.0的100 mM Na2HPO4中可得厚度差異較小的片狀奈米結構(51.9 ± 8.63 nm),且其結構具有較好的均一性。比較在不同pH下沉積之Cu3(PO2)2.2H2O的電化學特性,發現其Cu(0)與Cu(+2)氧化還原過電壓會隨著pH值下降而增加,但氧化還原波峰電流隨pH值下降而上升,特別在pH 5.0的100 mM Na2HPO4製作的電極可具有高穩定性與製作再現性等特點。
In the development of commercial biosensors, it is one of the important trends to reduce the electrode fabrication costs, improve the sensitivity, and lower the detection limit. In this study, a method of fabricating high surface-area copper electrode has been developed. By applying -0.181 V potential at 50oC in 1 M NaOH, the 2.84 ± 0.31-μm long needles-like Cu(OH)2 nanostructures can be reproducibly produced. However, the Cu(OH)2-deposited electrodes presented a poor conductivity without obvious redox reaction. Therefore, the dipping treatment for the alteration from the Cu(OH)2 nanostrctures to the sheet-like Cu3(PO4)2.2H2O nanostructures in pH-varied 100 mM Na2HPO4.Cu(OH)2 (pH5.0-7.0) has been discussed by the dissolution of Cu(OH)2 and the redeposition of Cu3(PO4)2.2H2O. The results show that the thickness, 51.9 ± 8.63 nm, of Cu3(PO4)2.2H2O nanosheets produced in 100 mM Na2HPO4 of pH 5.0 has the least variation and the best uniformity. To compare the electrochemical properties of Cu3(PO4)2.2H2O electrodes deposited in pH-varied 100 mM Na2HPO4 solution, the redox overpotential of Cu(0) and Cu(+2) increased with the decrase of Na2HPO4 pH values, and the redox peak current increased with the decreasing pH. Especially, the Cu3(PO4)2.2H2O-deposited electrodes fabricated in 100 mM Na2HPO4 of pH 5.0 exhibited high stability and reproducibility.
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