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Vol. 34, No. 8(3), S&M3042

Notice of retraction
Vol. 32, No. 8(2), S&M2292

Print: ISSN 0914-4935
Online: ISSN 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
is covered by Science Citation Index Expanded (Clarivate Analytics), Scopus (Elsevier), and other databases.

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Calculation of Photocatalyst Anatase TiO2 (1 0 1)/g-C3N4 (0 0 1) Properties Using Density Functional Theory [PDF]

Trung Tin Tran, Phuoc Thao Vo Du, Anh Hao Huynh Vo, and Trung Nghia Tran

(Received August 21, 2023; Accepted November 29, 2023)

Keywords: anatase TiO2, g-C3N4, heterostructure, visible-light photocatalyst, density functional theory

Titanium dioxide (TiO2), a metal oxide photocatalyst, is one of the most widely studied materials for photocatalytic applications in energy production and environmental remediation owing to its excellent photocatalytic performance. Recently, graphitic carbon nitride (g-C3N4) has gained a widespread photocatalytic application owing to its band gap of 2.70 eV, good physicochemical stability, ease of processing, and low cost. However, the photocatalytic performance characteristics of TiO2 and g-C3N4 determined individually have been confirmed by researchers to be unsatisfactory for heterogeneous photocatalysis owing to the high recombination capacity of photogenerated electron–hole pairs and the low energy conversion efficiency. A theoretical understanding of the relationship between the interfaces of TiO2 and g-C3N4 is still lacking. In this study, we investigated the effects of the interface structure on the electronic properties of the anatase TiO2/g-C3N4 heterostructure using density functional theory (DFT) calculations. The interaction between the anatase TiO2 surface and the g-C3N4 monolayer with (1 0 1)/(0 0 1) facets has been revealed, where a van der Waals heterojunction is formed. The anatase TiO2 (1 0 1)/g-C3N4 (0 0 1) heterostructure has a narrow band gap (1.876 eV) shown by DFT calculation. It effectively separates electron–hole pairs, leading to a strong optical absorption ability in the visible light region with a maximum absorption wavelength of 661 nm. The strengthened separation of electron–hole pairs and the restrained carrier recombination in the g-C3N4/TiO2 interface were analyzed on the basis of the Z-scheme photocatalytic mechanism. The results suggest that the anatase TiO2 (1 0 1)/g-C3N4 (0 0 1) heterostructure is a promising material for photocatalytic applications.

Corresponding author: Trung Nghia Tran




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