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Strain influence on the structural properties of nitrogen and fluorine codoped TiO2
Optik ( IF 3.1 ) Pub Date : 2020-01-26 , DOI: 10.1016/j.ijleo.2019.164029
Moushumi Dutta Purkayastha , Nisha Singh , Gopala Krishna Darbha , Tapas Pal Majumder

The present work aims at outlining the role of lattice strain in modifying the structural properties of doped samples. Dual doping of TiO2 by anions nitrogen (N) and fluorine (F) was carried out by a typical hydrothermal route using inorganic precursors; ammonia solution (NH3-H2O) and ammonium fluoride (NH4F). N monodoped TiO2 (NT) showed poor crystallinity while codoping with N, F promoted the crystal growth thereby resulting in tunable particle sizes. The synergistic effects of codoping was systematically examined by changing the molar ratio of F and N. The crystalline development in the doped samples was investigated by X-ray broadening and Williamson-Hall (W-H) analysis was used to study the contribution of lattice strain to it. In comparison to NT, codoped samples showed better visible light sensitivity. Strain; even in minute amounts; induced a pronounced effect on the structural properties of the doped samples. NFT1 with the maximum strain value exhibited distinct hexagonal morphology in comparison to NFT2 and NT with lower strain values. Also, photoluminescence intensity got enhanced with increase in strain values. This study manifests the influence of strain on the dynamics of charge carriers which might affect photoactivity as well.



中文翻译:

应变对氮和氟共掺杂TiO 2结构性能的影响

本工作旨在概述晶格应变在改变掺杂样品的结构特性中的作用。阴离子氮(N)和氟(F)对TiO 2的双重掺杂是通过典型的水热途径,使用无机前体进行的。氨溶液(NH 3 -H 2 O)和氟化铵(NH 4 F)。N单掺杂TiO 2(NT)在与N,F共掺杂时显示出差的结晶度,从而促进了晶体生长,从而导致了可调的粒径。通过改变F和N的摩尔比,系统地检查了共掺杂的协同效应。通过X射线展宽研究了掺杂样品中的晶体发展,并使用Williamson-Hall(WH)分析研究了晶格应变对掺杂的影响。它。与NT相比,共掺杂样品显示出更好的可见光灵敏度。应变; 即使微量 对掺杂样品的结构特性产生明显的影响。与具有较低应变值的NFT2和NT相比,具有最大应变值的NFT1表现出明显的六边形形态。另外,光致发光强度随着应变值的增加而增强。

更新日期:2020-01-26
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