Zno/cuo nanocomposite photocatalytic disinfectant activated by visible light
Visible-light-activated ZnO/CuO nanocomposite that inactivates bacteria such as E. coli and P. aeruginosa for surface disinfection. Built on a p-n heterojunction that lowers band gap and uses inexpensive, non-toxic metals as an alternative to UV-only photocatalysts.
Overview
This solution is a ZnO/CuO nanocomposite photocatalyst designed to inactivate bacteria on surfaces when exposed to visible light. The p-n heterojunction formed between CuO and ZnO reduces the effective band gap of the semiconductor system, enabling activation under visible light rather than requiring harmful UV sources. Because zinc and copper are inexpensive and non-toxic to humans, the material is well suited for practical disinfection applications. Reactive oxygen species generated on the photocatalyst surface damage bacterial cells, making the technology relevant for combating resistant pathogens that form protective biofilms.
Technical specifications
- Heterojunction design: CuO/ZnO p-n junction lowers band gap and enables visible-light-driven photocatalysis; CuO (band gap ~1.7 eV) acts as the visible-light absorber while ZnO stabilizes charge carriers.
- Target organisms: Demonstrated inactivation of E. coli and Legionella using photocatalytic principles; future work targets E. coli and P. aeruginosa as representative models for biofilm-forming, resistant pathogens.
- Synthesis routes: Hydrothermal and sol-gel methods to produce varied CuO/ZnO compositions with controlled particle shape and structure.
- Application formats: Aerosolized dispersions and solution drop casting onto surfaces for disinfection testing.
- Benchmarking: Performance compared against TiO2 P25 under visible light, near-UV, and UV irradiation at varying photon doses.
- Characterization: Zones of inhibition, bacterial inactivation assays, identification and quantification of reactive oxygen species, band gap determination, and imaging of effective compositions.
Technology readiness level
The technology is at an early-to-mid research and development stage. The research team has prior experience synthesizing photocatalytic metal oxide nanocomposites and has previously demonstrated bacterial inactivation using photocatalytic principles. Current work focuses on synthesizing CuO/ZnO compositions, validating visible-light-driven inactivation of E. coli and P. aeruginosa, and fully characterizing the most effective catalysts. Commercial deployment as a surface disinfectant would require further formulation, scale-up, and field validation beyond the laboratory studies described.
About Arizona State University
Arizona State University is a comprehensive public research university with a multi-campus presence across the Phoenix metropolitan area and a scale that supports interdisciplinary, use-inspired discovery. Industry partners access co-located laboratories, a research and technology park, and innovation centers that house corporate teams with faculty to speed prototyping and validation. A formal alliance with a major hospital system and proximity to a fast-growing manufacturing corridor enable clinical translation and pilot-scale testbeds, while applied student engagements create dependable talent pipelines. Research is backed by competitive federal funding from agencies such as NSF, NIH, DOE, DOD, and NASA. A dedicated technology transfer office supports IP, licensing, and startup formation.
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