Photocatalytic Properties of Titanium Dioxide Nanomaterials

Titanium dioxide nanomaterials have long been recognised for their capacity to harness light energy and drive chemical transformations at their surfaces. The fundamental mechanism involves generation of electron–hole pairs upon photon absorption, followed by migration of these charge carriers to reactive sites where they induce oxidation and reduction reactions. Parameters such as crystalline polymorph (anatase, rutile, brookite), particle size, surface morphology and the presence of dopants or co-catalysts dictate the efficiency of charge separation and minimise recombination losses. Advances in heterophase engineering, defect tuning and morphological control have led to materials that absorb a broader spectrum of light and exhibit enhanced interfacial charge transfer. These developments underpin practical applications in solar water splitting, CO₂ photoreduction and environmental remediation, reinforcing the global significance of TiO₂ nanocatalysts in sustainable energy and pollution control.

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Photocatalytic Properties of Titanium Dioxide Nanomaterials publication trend

The graph below shows the total number of articles in photocatalytic properties of titanium dioxide nanomaterials across all publications each year (not limited to Nature Index journals).

Technical terms

Photocatalysis: Acceleration of a chemical reaction by a material upon light absorption.

Electron–hole pair: A pair of charge carriers generated when a photon excites an electron from the valence band to the conduction band.

Bandgap: The energy difference between valence and conduction bands, governing light absorption onset.

Heterojunction: Interface between two different semiconductor phases that facilitates directional charge transfer.

Polymorph: Distinct crystalline structure of the same chemical composition, e.g. anatase, rutile or brookite forms of TiO₂.

Reactive oxygen species (ROS): Highly reactive oxygen-based intermediates (e.g. hydroxyl radicals) formed during photocatalysis.

References

1. Heterophase Polymorph of TiO2 (Anatase, Rutile, Brookite, TiO2 (B)) for Efficient Photocatalyst: Fabrication and Activity. Nanomaterials (2023).
2. Brookite, a sometimes under evaluated TiO 2 polymorph. RSC Advances (2022).
3. Bicrystalline TiO 2 with controllable anatase–brookite phase content for enhanced CO 2 photoreduction to fuels. Journal of Materials Chemistry A (2013).