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Synthesis and Reaction Chemistry of Nanosize Monosodium Titanate
Published on: February 23, 2016
Nanostructured Ti-W mixed-metal oxides: structural and electronic properties
M Fernández-García1, A Martínez-Arias, A Fuerte
1Instituto de Catalisis y Petroleoquímica, CSIC, C/ Marie Curie s/n, 28049-Madrid, Spain. mfernandez@icp.csic.es
The Journal of Physical Chemistry. B
|July 21, 2006
Summary
Tungsten doping in titanium dioxide nanoparticles alters their structure and electronic properties. This research explores how tungsten influences TiO2, revealing changes in lattice parameters and band gap crucial for material science applications.
Area of Science:
- Materials Science
- Solid State Chemistry
- Nanotechnology
Background:
- Titanium dioxide (TiO2) is a widely studied material with applications in catalysis and electronics.
- Tungsten (W) doping is explored to modify TiO2 properties.
- Understanding the structural and electronic impact of W in TiO2 nanoparticles is essential for advanced material design.
Purpose of the Study:
- To investigate the structural and electronic properties of Ti-W binary mixed oxide nanoparticles.
- To determine the effect of W content on the anatase structure and electronic band gap.
- To correlate local/long-range order with electronic parameters in Ti-W systems.
Main Methods:
- Preparation of Ti-W binary oxide nanoparticles (8-13 nm) with W content < 20 atom % via microemulsion.
- Characterization using X-ray diffraction, Raman, X-ray absorption spectroscopies (XANES, EXAFS), and UV-vis spectroscopy.
- Theoretical analysis using density functional calculations.
Main Results:
- W atoms substitute Ti in the anatase structure, causing lattice expansion (c-axis).
- W local order changes around 15 atom % W content; charge neutrality is maintained by cation vacancies.
- Band gap nonlinearly decreases with W content, showing a turning point at ~15 atom % W.
Conclusions:
- W doping significantly impacts the structural and electronic properties of TiO2 nanoparticles.
- The observed changes in lattice, electronic density, and band gap are linked to W concentration and local structure.
- These findings provide insights into the structure-property relationships of Ti-W mixed oxides for potential applications.
