Preparation and characterization of TiO_2 nanobelts deposited with Bi_2Se_3 nanoplates

摘要

Bi_2Se_3-deposited TiO_2 nanobelts have been prepared through hydrolytic adsorption of Bi-species and hydro-thermal treatment process. Various measurement results demonstrate that the hexagonal semiconductor Bi_2Se_3 particles, with nanoplate-like morphology and controllable content, are deposited on the surface of an-atase TiO_2 nanobelts. Their length is mainly in the range of 20-60 nm. Due to the quantum size effect of Bi_2Se_3 nanoplates, this type of nanocomposites exhibits very strong visible light absorption. They also show high BET special surface area, which decreases to different extent with increasing Bi_2Se_3 content. Low Bi_2Se_3 content is found to be beneficial for visible light photocatalytic degradation of Rhodamine B. The visible light photocatalytic activity of nanocomposite with low Bi_2Se_3 content is much higher than that of the pure TiO_2 nanobelts.