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Although TiO 2  was formerly a common material for photocatalysis reactions, its wide band gap (3.2 eV) results in absorbing only ultraviolet light, which accounts for merely 4% of total sunlight. Modifying TiO 2  has become a focus of photocatalysis reaction research, and combining two metal oxide semiconductors is the most common method in the photocatalytic enhancement process. When MoO 3  and TiO 2  come into contact to form a heterogeneous interface, the photogenerated holes excited from the valence band of MoO 3  should be transferred to the valence band of TiO 2  to effectively reduce the charge recombination of photogenerated electron–hole pairs. This can efficiently separate the pairs and promote photocatalysis efficiency. In addition, photocurrent enhancement is attributed to the strong near-field and light-scattering effects from plasmonic Ag nanoparticles. In this work, we fabricated MoO 3 -coated TiO 2  nanotube heterostructures with a 3D hierarchical configuration through two-step anodic oxidation and a facile hydrothermal method. This 3D hierarchical structure consists of a TiO 2  nanotube core and a MoO 3  shell (referred to as TNTs@MoO 3 ), as characterized by field emission scanning electron microscopy and X-ray photoelectron spectroscopy.   Electronic supplementary material  The online version of this article (10.1186/s11671-017-2327-y) contains supplementary material, which is available to authorized users.

Photocatalytic Activities Enhanced by Au-Plasmonic Nanoparticles on TiO2 Nanotube Photoelectrode Coated with MoO3