Investigating Visible-Photocatalytic Activity of MoS2-TiO2 Heterostructure Thin Films at Various MoS2 Deposition TimesReportar como inadecuado




Investigating Visible-Photocatalytic Activity of MoS2-TiO2 Heterostructure Thin Films at Various MoS2 Deposition Times - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Journal of Nanomaterials - Volume 2017 2017, Article ID 3197540, 6 pages - https:-doi.org-10.1155-2017-3197540

Research Article

Ho Chi Minh City University of Science, Ho Chi Minh City, Vietnam

Tay Nguyen University, Buon Ma Thuot City, Daklak Province, Vietnam

Correspondence should be addressed to Hang Nguyen Thai Phung

Received 1 March 2017; Revised 24 April 2017; Accepted 7 May 2017; Published 15 June 2017

Academic Editor: Weilu Gao

Copyright © 2017 Hang Nguyen Thai Phung et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

MoS2-TiO2 heterostructure thin films were fabricated by sol-gel and chemical bath deposition methods. Crystal structure, surface morphology, chemical states of all elements, and optical property of the obtained thin films were characterized by using X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and UV-Vis spectroscopy techniques, respectively. Photocatalytic activity of all thin films was evaluated by measuring decomposition rate of methylene blue solution under visible light irradiation. The results indicate that ultrathin MoS2 film on TiO2-glass substrate improves photocatalytic activity of TiO2 in the visible light due to the efficient absorption of visible photon of MoS2 few layers and the transfer of electrons from MoS2 to TiO2. All MoS2-TiO2 heterostructure thin films exhibit higher visible light photocatalytic activity than that of pure MoS2 and TiO2 counterparts. The best MoS2-TiO2 heterostructure thin film at MoS2 layer deposition time of 45 minutes can decompose about 60% MB solution after 150 minutes under visible light irradiation. The mechanism of the enhancement for visible-photocatalytic activity of MoS2-TiO2 heterostructure thin film was also discussed.





Autor: Hang Nguyen Thai Phung, Van Nguyen Khanh Tran, Lam Thanh Nguyen, Loan Kieu Thi Phan, Phuong Ai Duong, and Hung Vu Tuan Le

Fuente: https://www.hindawi.com/



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