Abstract
Pd–TiO 2 nanotube arrays (Pd–TNTs) which are highly ordered and vertically grown on Ti–0.2Pd alloy were fabricated by electrochemical anodization for the first time. The obtained Pd–TNTs were utilized as a “super vessel” for assembly of myoglobin (Mb) and biosensing applications. Experimental results demonstrate that the resulting Pd–TNTs display an enhanced capability for the immobilization of myoglobin. The direct electrochemistry of the immobilized Mb is dramatically facilitated, indicated by a couple of well-defined redox peaks and a very large electron transfer rate constant ( k s) of 20.7 s − 1 . Furthermore, Mb/Pd–TNTs present excellent electrocatalytic activity for the detection of trichloroacetic acid with a wide linear range from 0.5 to 96 μM and a low detection limit of 94 nM (3 N/S). Pd–TNTs with highly ordered nanotubular structure open a facile way to obtain ideal materials for biomolecular assembly and construct electrochemical biosensors.
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