Unravelling the role of lithium and nickel doping on the detect structure and phase transition of anatase TIO2 nanoparticles

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Vázquez López, Antonio and Maestre Varea, David and Martínez Casado, Ruth and Ramírez Castellanos, Julio and Pís, Igor and Nappini, Silvia and Cremades Rodríguez, Ana Isabel (2022) Unravelling the role of lithium and nickel doping on the detect structure and phase transition of anatase TIO2 nanoparticles. Journal of materials science, 57 (14). pp. 7191-7207. ISSN 0022-2461

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Official URL: http://dx.doi.org/10.1007/s10853-022-07122-x




Abstract

Anatase TiO_2 nanoparticles doped either with Li or Ni have been synthesized via hydrolysis in variable concentrations. Microstructural analysis confirms the high crystallinity of the doped nanoparticles with sizes around 7 nm, while compositional analysis shows low doping below 2% at. Despite the low concentration of dopants, variations in the Raman and Photoluminescence signals were observed in the doped nanoparticles, mainly due to non-stoichiometry and oxygen deficiency promoted by Li or Ni doping. Doping effects associated with Li and Ni were observed by photoelectron spectroscopy and first principle calculations, which associate the appearance of states in the valence band region to oxygen deficiency and Li or Ni doping and lower n-type character induced by Ni doping. Finally, changes in the thermally induced anatase-to-rutile transition (ART) have been also observed in the doped samples, leading to a dopant-promoted faster ART which occurs at lower temperature boosted due to the dopant effect.


Item Type:Article
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©2022 Springer
We acknowledge Elettra Sincrotrone Trieste for providing access to its synchrotron radiation facilities. This work was supported by MINECO/FEDER/M-ERA.Net Cofound projects: RTI2018-097195-B-I00 and PCIN-2017-106. I.P. and S.N. gratefully acknowledge financial support from EUROFEL.

Uncontrolled Keywords:X-ray-absorption; Doped TiO_2; Photocatalytic activity; Catalytic-activity; Oxygen vacancy; l-edge; Titanium; Transformation; 2p; Photoluminescence
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:72025
Deposited On:04 May 2022 15:04
Last Modified:04 May 2022 16:52

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