Abstract
We prepared nanocrystalline mesoporous anatase-phase TiO2 doped in the range from 0.0 to 1.0 at.% of Nd3+ by the reverse microemulsion method (RMM). The analysis of electron microscopy of the nanocrystal revealed a truncated-tetragonal bipyramidal shape and agglomerates of spheroidal nanoparticles with inter-particle porosity. The inductively coupled plasma (ICP) technique corroborated the doping concentrations. The analysis of structural parameters by the Rietveld refinement technique indicated the variation of Ti–O(1) and Ti–O(2) bond lengths, suggesting the Nd3+ insertion in the lattice. The microstructural analysis by the Williamson–Hall plot (WH) and whole powder pattern fitting (WPPF) revealed that the doping addition has a slight inhibition effect on the crystal size (6–8 nm) with a minor strain increment. The surface analysis from N2 adsorption/desorption isotherms showed that the incorporation of the dopant in low amounts improved the mesoporous structure stability, increased the diameter of opening pores, and changed the pore structure network. The XPS analysis of the chemical states on the surface suggests that the Nd3+ presence changed the Ti 2p region and the presence of the two chemical states of oxygen (OI and OII).
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Acknowledgements
The Secretary of Public Education (SEP) and the Technological Nacional of Mexico (TecNM) supported this research [ITTIJ-PTC-009, PRODEP]. The authors wish to thank Tijuana Technological Institute for Scientific Research, Investigations Center of Advanced Materials (CIMAV), and Center of Nanoscience and Nanotechnology (CNyN-UNAM) for providing the facilities. Ernesto Lestargette is acknowledged for providing X-ray patterns, Carlos Ornelas for HRTEM images, David Dominguez for XPS survey, and Luis de la Torre-Saenz for N2 sorption isotherms. The authors wish to thank the engineering students: Jose Maria Hernandez, Henry Alvarez-Huerta, and Ricardo Xoxocotla for collection of data.
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Trujillo-Navarrete, B., Paraguay-Delgado, F. & Pérez-Sicairos, S. Structure, microstructure and surface of Nd3+-doped mesoporous anatase-phase TiO2. Appl. Phys. A 126, 592 (2020). https://doi.org/10.1007/s00339-020-03768-z
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DOI: https://doi.org/10.1007/s00339-020-03768-z