Abstract
We investigated the effect of HMT (hexamethylenetetraamine) on the anodic growth of TiO2 nanotube arrays. The tube length increases to 4.3 μm with HMT concentration increasing to 0.04 mol·L−1. Adsorption of HMT on the TiO2 surface is shown to markedly decrease the chemical dissolution rate of tube mouth, resulting in longer nanotube length. Furthermore, Pt nanoparticles were successfully deposited on the surface of TiO2 nanotubes by ac electrodeposition method. The TiO2/Pt composites were characterized by field emission scanning electron microscope (FESEM), X-ray photoelectron spectra (XPS), and photoelectrochemistry. An enhancement in photocurrent density has been achieved upon modification of TiO2 nanotubes with Pt nanoparticles.
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