Voltammetric Determination of Catechol in the Presence of an Interferent Ascorbic Acid at a Sonogel-Carbon Electrode Modified with Titanium Oxide (TiO2)

A newly developed sonogel-carbon electrode was prepared by coating it with a TiO2 sol-gel and heated at 500 ºC. The electrochemical response of the newly developed sonogel-carbon electrode modified with TiO2 was compared to that of an unmodified sonogel- carbon electrode. The modified electrode showed marked enhanced detection of catechol in the prescence of ascorbic acid. Also the sonogel-carbon electrode modified with TiO2 stability was compared to an electrochemically prepared conducting poly(3-methylthiophene) electrode in the detection of catechol over 25 scans. The sonogel-carbon electrode modified with TiO2 was more stable over repetitive scans. This new modified titanium oxide electrode surface could be used in several chemical sensor applications of environmental and biological interest.