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DFT Insights into the Role of Relative Positions of Fe and N Dopants on the Structure and Properties of TiO2

by Sahar Ramin Gul 1,2, Matiullah Khan 1,3, Zeng Yi 1,* and Bo Wu 2,*
1
State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
2
Multiscale Computational Materials Facility, College of Materials Science and Engineering, Fuzhou University, Fuzhou 350100, China
3
Department of Physics, Kohat University of Science and Technology (KUST), Kohat 26000, Pakistan
*
Authors to whom correspondence should be addressed.
Materials 2018, 11(2), 313; https://doi.org/10.3390/ma11020313
Received: 6 February 2018 / Revised: 11 February 2018 / Accepted: 12 February 2018 / Published: 22 February 2018
(This article belongs to the Section Energy Materials)
The location and nature of the doped elements strongly affect the structural, electronic and optical properties of TiO2. To tailor the band structure and modify the photoelectrochemical properties of TiO2, a pair of dopants is selected. Fe and N atoms are inserted in the TiO2 network at substitutional and interstitial sites with different relative distances. The main objective behind the different locations and sites of the doped elements is to banish the isolated unoccupied states from the forbidden region that normally annihilates the photogenerated carriers. Fe at the Ti site and N at the O site doped in the TiO2 network separated at a distance of 7.805 Å provided a suitable configuration of dopant atoms in terms of geometry and band structure. Moreover, the optical properties showed a notable shift to the visible regime. Individual dopants either introduced isolated unoccupied states in the band gap or disturbed the fermi level and structural properties. Furthermore, the other co-doped configurations showed no remarkable band shift, as well as exhibiting a suitable band structure. Resultantly, comparing the band structure and optical properties, it is argued that Fe (at Ti) and N (at O) doped at a distance of 7.805 Å would strongly improve the photoelectrochemical properties of TiO2. View Full-Text
Keywords: density functional theory; Fe; N-TiO2; optical properties density functional theory; Fe; N-TiO2; optical properties
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Ramin Gul, S.; Khan, M.; Yi, Z.; Wu, B. DFT Insights into the Role of Relative Positions of Fe and N Dopants on the Structure and Properties of TiO2. Materials 2018, 11, 313.

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