High-density arrays of polythiophene nanotubes were successfully prepared through electrochemical polymerization of the monomer in the pores of porous anodic alumina (PAA) template. The resultant polymeric tubular structures were identified by the field-emission scanning electron microscopy with a diameter of the order of ca 100 nmand a length of up to several micrometers. Different characterizations, including SEM, TEMand EDS,were employed to prove that conducting polythiophene nanotubes were synthesized successfully by this facile method. The synthesized polythiophene nanotubes were employed for proposing a new electrochemical sensor for Riboflavin (RF). Under optimal conditions, the suggested sensor could be used for determination of RF ranging from 0.01 to 65 μM with a low detection limit of 3 nM. The prepared sensor possessed accurate and rapid response to RF and good sensitivity, stability and repeatability. Furthermore it showed an average recovery of 97% in human plasma.
