GOLD NANOPARTICLES MODIFIED TITANIA NANOTUBE ARRAYS FOR AMPEROMETRIC DETERMINATION OF ASCORBIC ACID

Development and use of highly ordered, vertically aligned TiO2 nanotube arrays modified with gold nanoparticles for the selective detection of ascorbic acid (AA) in the presence of uric acid and glucose are reported here. Gold nanoparticles were electrodeposited on the Nanotube arrays by CV. The sensor was characterized using SEM, EDS, CV, and EIS. It showed very good performance with a sensitivity of 46.8 mu A mM(-1) cm(-2), response time below 2 seconds and linearity in the range of 1 mu M to 5mM with a detection limit of 0.1 mu M and was tested for the AA concentration in pharmaceutical preparations.