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Photoreduction route for Cu2O/TiO2 nanotubes junction for enhanced photocatalytic activity

Authors
  • Pham, Van Viet1
  • Dai-Phat Bui1
  • Tran, Hong Huy1
  • Cao, Minh Thi2
  • Nguyen, Tri Khoa3
  • Kim, Yong Soo3
  • Le, Van Hieu
Type
Published Article
Journal
RSC Advances
Publisher
The Royal Society of Chemistry
Publication Date
Jan 06, 2018
Volume
8
Identifiers
DOI: 10.1039/c8ra01363b
Source
MyScienceWork
License
Green

Abstract

Here, we synthesized copper(I) oxide and titanium dioxide nanotubes (TNTs) heterojunctions (HJs) by a photoreduction method using a low-power UV lamp without involving any additional steps, such as chemical reduction, surfactant, or protection agents. Transmission electron microscopy, X-ray diffraction, Raman scattering, X-ray photoelectron spectroscopy, diffuse reflectance spectra, and photoluminescence spectroscopy were carried out to verify the formation of a HJ between the Cu2O nanoparticles (Cu2O NPs) and TNTs. The efficiency and the rate of methylene blue photo-degradation over the Cu2O/TNTs HJ were found to be nearly double and triple compared to the isolated TNTs. The enhanced efficiency is attributed to the narrow band gap and defect states caused by the oxygen vacancies in the vicinity of HJs. Moreover, the type II band alignment of Cu2O NPs and TNTs naturally separates the photo-generated carriers and constrains the recombination process owing to the internal electric field across the Cu2O/TNTs interface.

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