Electrochemical performance of gold nanoparticles decorated on Multi-walled Carbon Nanotube (MWCNT) Screen-printed Electrode (SPE)

Abstract

The modification of the multi-walled carbon nanotube screen-printed electrode (MWCNT/SPE) with gold nanoparticles (AuNP) was achieved through drop-casting method utilizing gold nanoparticles synthesized via the Turkevich method. The combination of nanomaterial based on carbon (multi-walled carbon nanotubes) and the noble metal (gold nanoparticles) aims to exploit the synergistic benefits of the two materials in electrochemical measurement. Electrochemical performance was evaluated through techniques including cyclic voltammetry and electrochemical impedance spectroscopy (EIS). The results indicated an increase in the electroactive surface area of the modified working electrodes compared to the unmodified ones. This increase in electroactive surface area can be attributed to the successful decoration of AuNP, which facilitates greater surface interactions and improved electron transfer kinetics, crucial for efficient catalytic reactions. The decoration of AuNP also makes sure that the electrode will have good biocompatibility for future bioanalytical applications. This investigation’s main goal was to determine the effects of the AuNP modification methods to the carbon electrode’s electroactive surface area for further contributing to the development of efficient label-free sensing platforms for diverse applications in biosensing.