Yissum - Research Development Company of the Hebrew University

Self-Cleaning Coating based on Photocatalytic Titanium-Oxide for Decontamination of Surfaces and Water

Posted by Yissum - Research Development Company of the Hebrew UniversityResponsive · Innovative Products and Technologies · Israel

Summary of the technology

Molecular Layer Deposition process to obtain catalytically active surfaces
Keywords: surface, MLD, photocatalysts, hydrogen peroxide
Project ID : 15-2012-2780

Yissum - Research Development Company of the Hebrew University
Yissum - Research Development Company of the Hebrew University

Description of the technology

Oxygen-deficient films prove to be highly photo-reactive, efficient for decontaminating water, harnessing solar energy, and self-cleaning surfaces


Notably, metal oxides, particularly titanium oxides, often exhibit high chemical and physical stability, durability, and photo-reactivity that can be utilized in many applications. However, until now there have not been many successful attempts to utilize light as a sole energy source using titanium oxide-based materials, to a level that will enable the decontamination of toxic materials such as benzoic acids and other difficult to treat organic compounds.

We have demonstrated that hybrid organic/inorganic thin films produced through a specialized MLD (molecular layer deposition) process, allow comprehensive control over the titanium-oxide properties and their stoichiometry, and enable the production of exceptionally high photo-reactive coatings.

The hybrid films undergo a thermal annealing process at specific temperatures, causing the organic components to decompose and the inorganic components to crystallize while maintaining pre-designed defects, thereby yielding controllable oxygen-deficient titanium oxide film with high photo-reactivity and other unique electronic properties.

We have applied two different methods for producing high-photocatalytic films, both exhibiting reactions not typically attainable by titanium oxide materials. The first method enables photo-degradation of organic molecules at room temperature after annealing the film in an optimal temperature of 650° C, while the second method anneals the film at 520° C, resulting in the direct production of HO (hydrogen peroxide) during photo-catalysis.

Thus, we have found a direct correlation between the oxygen-deficient titanium, the film’s unique electronic properties, and its enhanced photo-reactivity, enabling its tailoring to specific applications.

Our Innovation

We have developed a novel technique for producing thin titanium-oxide coatings that are highly-photo-reactive, and can be utilized in varied applications such as self-cleaning surfaces; coatings that decontaminate building surfaces; decontaminating water; harnessing solar energy, and others. The films comprise a layered hybrid of organic and inorganic components that are transformed by thermal treatment to super-photo-reactive oxide material. These photocatalytic films, when exposed to UV light, prompt chemical reactions of oxidation and reduction processes at the film’s surface, resulting in the decontamination of organic and chemical pollutants adsorbed on the surface.

Diagram a: Coating’s production process scheme

Diagram b: Two annealing methods for film optimization


The growing interest in recent years in photocatalytic thin film coatings comprising metal oxides has prompted the development of thin photocatalytic films suitable for such applications as:

  • Coatings containing self-cleaning powdered paint additives that decontaminate urban building surfaces, graffiti-repellent coatings.
  • Self-cleaning coatings for windows and building exteriors, solar panels, marine and aircraft vessels
  • Decontamination of polluted water and air
  • Self-cleaning coatings for sterilizing lab equipment, filtration membranes, and medical devices.


  • Customizable films suited to each specific application
  • Innovative technique yielding film that is five times more reactive than other TiO films
  • Versatile usages of the coatings on glass, metal, or plastic
  • Low-cost materials that do not contain toxic substances
  • Materials are designed at the molecular level, enabling close control over catalyst composition

Development milestones

  • Process was optimized for direct implementation on solid surfaces and for the decomposition of organic materials, proven to perform better than conventional TiO
  • Additional investment would be required for future R&D and scaling up for the production of a new type of coating containing powdered additives that decontaminate urban building surfaces, paints, as well as water containing toxic chemicals or sewage water for large scale applications requiring bulk quantities.

Researcher informationhttp://chem.ch.huji.ac.il/~roie/

Project manager

Matt Zarek

Project researchers

Roie Yerushalmi
HUJI, Faculty of Science
The Institute of Chemistry

Related keywords

  • Chemistry
  • Materials Technology
  • Nanotechnologies related to electronics & microelectronics
  • Micro and Nanotechnology related to Electronics and Microelectronics
  • Electronics, Microelectronics
  • Chemicals and Materials
  • Some other electronics related
  • Chemistry & Materials
  • Coatings

About Yissum - Research Development Company of the Hebrew University

Technology Transfer Office from Israel

Yissum Research Development Company of the Hebrew University of Jerusalem Ltd. Founded in 1964 to protect and commercialize the Hebrew University’s intellectual property. Ranked among the top technology transfer companies, Yissum has registered over 8,900 patents covering 2,500 inventions; has licensed out 800 technologies and has spun-off 90 companies. Products that are based on Hebrew University technologies and were commercialized by Yissum generate today over $2 Billion in annual sales.

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