Photocatalytic Properties of Nitrogen-Doped Titanium Oxide Thin Films
Summary
Nitrogen-doped titanium oxide (N–TiO₂) thin films represent a major advance in semiconductor photocatalysis by extending the inherently wide band gap of anatase TiO₂ into the visible range. Incorporation of nitrogen into the lattice—either substitutionally at oxygen sites or interstitially—creates mid-gap states that lower the effective band gap and enable absorption of longer-wavelength light. In thin-film form, precise control over crystallinity, thickness and dopant distribution is achieved via techniques such as reactive sputtering, plasma treatments and atomic layer deposition. These structural parameters govern charge-carrier separation and surface redox activity, determining rates of pollutant degradation, water splitting and CO₂ reduction. Optimising nitrogen content and defect chemistry also influences recombination dynamics, surface adsorption of reactants and long-term film stability. Ongoing efforts focus on balancing visible-light response with durability, uniformity over large areas and integration into photoelectrochemical devices for sustainable energy and environmental applications.
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Technical terms
Anatase phase: One of the crystalline polymorphs of TiO₂ with a tetragonal lattice, noted for high photocatalytic activity under ultraviolet light.
Substitutional nitrogen doping: Replacement of oxygen atoms in the TiO₂ lattice by nitrogen atoms, resulting in band-gap narrowing and visible-light absorption.
Band gap: The energy difference between the valence and conduction bands of a semiconductor that determines its optical absorption threshold.
Reactive magnetron sputtering: A thin-film deposition technique in which a target is eroded by plasma ions in the presence of reactive gases, forming compound films on a substrate.
References
- Tuning the optical bandgap of TiO2-TiN composite films as photocatalyst in the visible light. AIP Advances (2013).
- Sequential Processes to Produce N-TiO2 Films Through Rf Plasmas. MATEC Web of Conferences (2016).
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