Electronic and Optical Properties of Titanium Dioxide Systems
Summary
Titanium dioxide (TiO₂) is a wide‐band‐gap semiconductor renowned for its chemical stability, low cost and strong photoactivity under ultraviolet irradiation. The electronic structure is dominated by an oxygen 2p–titanium 3d valence‐to‐conduction band arrangement, yielding a band gap of approximately 3.0–3.2 eV in its anatase and rutile polymorphs. Optical responses are characterised by strong absorption in the near‐UV, high refractive indices and well‐defined excitonic features. Variations in crystalline phase, particle size and morphology modulate both carrier mobility and light–matter interactions. Engineering efforts focus on band‐gap tuning—via aliovalent and isovalent doping, defect design or heterojunction formation—to extend absorption into the visible region, suppress charge‐carrier recombination and enhance practical applications in photocatalysis, solar water splitting, photovoltaics and environmental remediation.
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Electronic and Optical Properties of Titanium Dioxide Systems publication trend
The graph below shows the total number of articles in electronic and optical properties of titanium dioxide systems across all publications each year (not limited to Nature Index journals).
Technical terms
Band gap: The energy difference between the valence band maximum and conduction band minimum in a semiconductor, determining the wavelengths of light that can be absorbed.
Density functional theory (DFT): A quantum‐mechanical computational framework for predicting electronic structure and related properties of materials from first principles.
Photocatalysis: A process in which a material absorbs light to generate reactive charge carriers that drive chemical transformations, such as pollutant degradation or water splitting.
Dielectric function: A frequency‐dependent complex quantity describing how a material polarises in response to an electric field, governing its optical absorption and reflectivity.
Refractive index: A measure of how much light is slowed and bent when entering a material, related to the real part of the dielectric function and critical for light–matter interactions.
References
- Role of outer shell electron-nuclear distant of transition metal atoms (TMA) on band gap reduction and optical properties of TiO2 semiconductor. Results in Engineering (2024).
- First principles study of optical properties of Ni- and Pd-doped TiO2 as visible light catalyst. Materials for Renewable and Sustainable Energy (2023).
- Modulating Optoelectronic and Elastic Properties of Anatase TiO2 for Photoelectrochemical Water Splitting. Molecules (2023).
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