One-dimensional nitrogen-doped carbon nanotube arrays fabricated by template carbonization over anodized TiO2 nanotube arrays

Template carbonization of polypyrrole nanofilm coated on TiO2 nanotube arrays is proposed to fabricate one-dimensional nitrogen-doped carbon nanotube arrays (N-CNTAs) without using any foreign catalyst. Ultra-thin nitrogen-doped carbon nanofilm with thickness of 1 similar to 2 nm is formed on the wall of TiO2 nanotubes. The N-CNTAs possess high density of graphitic edge planes and exhibit an ideal Nernst behavior towards [Fe(CN)(6)](3/4) redox couple. Determination of dopamine has been demonstrated in the linear range of 5-175 mu M with a detection limit of 0.19 mu M (S/N = 3). Selective monitoring of uric acid with a linear range of 0.1-150 mu M in the coexistence of 1 mM ascorbic acid has also been illustrated. (C) 2019 Elsevier B.V. All rights reserved.