| Abstrakt: |
The utilization of carbon paste as an electrochemical biosensor electrode in glucose electro-oxidation reactions increases significantly. Typically, oxidizing glucose is electrochemically slow and challenging. The electro-oxidation reaction on a carbon electrode surface has the electron-transfer rate constant, k0, representing their reaction rate. It is necessary to add some catalysts, such as gold nanoparticles (AuNP), to carbon paste to increase the oxidation rate of glucose. This research uses carbon paste containing the incorporated gold nanoparticles on Cu-BTC MOF as a glucose electro-oxidation electrode to improve the catalytic activity of oxidizing glucose. Mixing Cu-BTC with gold nanoparticle solution without any polymer stabilizer produces the gold nanoparticles/Cu-BTC composite (AuNP@Cu-BTC). Adding the gold nanoparticle changed Cu-BTC's color from bright blue to darker blue. Investigation of the catalytic activity (k0) conducted by cyclic voltammetry method. As a result, the carbon paste electrode containing AuNP@Cu-BTC composite has a k0 value of 2.29x10−4 cm2 s−1, significantly larger than standard carbon paste, carbon paste with gold nanoparticles, and carbon paste with Cu-BTC that has a k0 value of 2.7x10−7 cm2 s−1, 4.55x10−5 cm2 s−1, and 9.38x10−5 cm2 s−1, respectively. In conclusion, adding gold nanoparticles and Cu-BTC MOF as catalysts can increase glucose electro-oxidation's electron-transfer rate constant. [ABSTRACT FROM AUTHOR] |
