Biocatalytic Electrodes Based on Single-Walled Carbon Nanotube Network Thin Films

Carbon nanotubes (CNTs) in CNT paste, multi-walled CNT bundles and vertically aligned single-walled CNT (SWNT) arrays have been used as electrode materials. Recently, it was reported that CNTs facilitate the direct or mediated electron transfer from redox enzymes to glassy carbon electrodes. In this paper, we demonstrate a new form of transparent and conducting SWNT thin film electrochemical electrodes and characterize their performance. The SWNT thin film electrodes exhibit a high surface area, high conductivity and tunable current density without the need for a conducting support. Furthermore, we functionalize the SWNT thin film electrodes with active enzymes. Facile immobilization of redox enzymes on these electrodes reveals great potential for future applications, such as biosensors and biofuel cells.