Photocatalytic Applications of Tungsten Oxide Nanostructures

Tungsten oxide (WO₃) nanostructures have attracted considerable attention as photocatalysts due to their appropriate band gap in the visible spectrum (≈2.6–2.8 eV), robust chemical stability and polymorphic versatility. Controlled synthesis techniques—such as hydrothermal, solvothermal and electrospinning methods—enable the fabrication of one-dimensional (nanowires, nanorods, nanofibres), two-dimensional (nanoplates, nanosheets) and three-dimensional (aerogels, hierarchical architectures) morphologies. These structures afford high surface areas and promote light harvesting. Introducing oxygen vacancies or doping with metals (Ag, Zn, Pd) and non-metals, as well as coupling WO₃ with graphene, TiO₂ or polymer matrices, extends light absorption into the visible and near-infrared regions, suppresses electron–hole recombination and establishes heterojunctions or Schottky interfaces that enhance charge separation. Such advances underpin diverse applications: photodegradation of organic dyes and phenols in water, removal of volatile organic compounds from air, solar water oxidation for hydrogen production and even phototherapeutic antibacterial or anticancer strategies. The global significance of these developments lies in the potential for scalable, low-cost systems for environmental remediation, indoor-air purification and sustainable energy conversion, bridging laboratory innovation and real-world impact.

Research from Nature Portfolio

Recent studies have demonstrated that chemically modified WO₃ nanoplates co-functionalised with reduced graphene oxide and phosphate groups exhibit a sixfold enhancement in photoelectrochemical water oxidation and simultaneous phenol degradation under visible light. The dual modification promotes efficient electron transfer to the conductive graphene network and hole trapping by phosphate anions, markedly improving charge-carrier separation. Another line of work has exploited silver-loaded WO₃ nanostructures as photocatalytic agents for targeted cell killing under UV–visible irradiation. Formation of a Schottky junction at the Ag–WO₃ interface inhibits recombination of photo-generated charges and induces surface plasmon resonance in silver nanoparticles, thereby enhancing reactive oxygen species production for effective photodynamic therapy applications.

Photocatalytic Applications of Tungsten Oxide Nanostructures publication trend

The graph below shows the total number of articles in photocatalytic applications of tungsten oxide nanostructures across all publications each year (not limited to Nature Index journals).

Technical terms

Photocatalysis: Acceleration of a photoreaction at the surface of a semiconductor, generating reactive species for chemical transformation.

Band gap: Energy difference between the valence and conduction bands of a semiconductor that determines its light absorption range.

Oxygen vacancy: A defect created by the removal of an oxygen atom from the crystal lattice, which can introduce mid-gap states and enhance visible-light absorption.

Heterojunction: Interface formed between two different semiconductors that facilitates charge-carrier separation by band alignment.

Schottky junction: Metal–semiconductor interface that creates a built-in electric field, reducing electron–hole recombination and improving photocatalytic performance.

References

1. Synthesis and Characterization of WO3/Graphene Nanocomposites for Enhanced Photocatalytic Activities by One-Step In-Situ Hydrothermal Reaction. Materials (2018).
2. Hydrothermal synthesis and characterization of WO3 nanostructures: Effect of reaction time. Materials Research Express (2020).
3. Synthesis and characterization of Zn doped WO3 nanoparticles: photocatalytic, antifungal and antibacterial activities evaluation. Materials Research Express (2020).
4. Facile Strategy for Synthesizing Non-Stoichiometric Monoclinic Structured Tungsten Trioxide (WO3−x) with Plasma Resonance Absorption and Enhanced Photocatalytic Activity. Nanomaterials (2018).
5. Tungsten Trioxide as a Visible Light Photocatalyst for Volatile Organic Carbon Removal. Molecules (2014).
6. Photocatalysis of WO3 Nanoplates Synthesized by Conventional‐Hydrothermal and Microwave‐Hydrothermal Methods and of Commercial WO3 Nanorods. Journal of Nanomaterials (2014).
7. Visible Light Photocatalytic Activity of Ag/WO3 Nanoparticles and its Antibacterial Activity Under Ambient Light and in The Dark. Results in Engineering (2022).
8. Photocatalytic WO 3 /TiO 2 nanowires: WO 3 polymorphs influencing the atomic layer deposition of TiO 2. RSC Advances (2016).
9. A Simple Method of Electrospun Tungsten Trioxide Nanofibers with Enhanced Visible-Light Photocatalytic Activity. Nano-Micro Letters (2015).
10. Electrospun tungsten trioxide nanofibers decorated with palladium oxide nanoparticles exhibiting enhanced photocatalytic activity. RSC Advances (2017).
11. Photo-catalytic Killing of HeLa Cancer Cells Using Facile Synthesized Pure and Ag Loaded WO3 Nanoparticles. Scientific Reports (2018).
12. Effect of the Morphology of Tungsten Oxide Embedded in Sodium Alginate/Polyvinylpyrrolidone Composite Beads on the Photocatalytic Degradation of Methylene Blue Dye Solution. Materials (2020).
13. Enhanced photoelectrochemical activities for water oxidation and phenol degradation on WO3 nanoplates by transferring electrons and trapping holes. Scientific Reports (2017).