Fabrication of High Surface-area Copper Electrodes for the Application of Electrochemical Sensors

• Main Authors: Chiuan-Ting Jiang, 江權庭
• Other Authors: Ching-Chou Wu
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/kf5sst

碩士 === 國立中興大學 === 生物產業機電工程學系所 === 100 === 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.