Nanomaterials - Consulting and education

deutsche Flagge englische Flagge chinesische Flagge
Dieter Vollath

Catalytic Properties of Nanoparticles

Photocatalytic cracking of organic compounds in combination with superhydrophobic ("Lotus-effect") or superhydrophilic properties leads to self-cleaning surfaces. However, superhydrophobic surface coating is - in most cases - made with additions of organic compounds. Therefore, one has to be careful in view of the long-time stability. Besides self-cleaning, photocatalytic cracking of organic molecules is often used for deodorising and disinfection. For these applications the following photocatalytic active particles are ion use:

TiO2, Fe2O3, Fe2O3/Au, Ag

More efficient and selective catalyst are obtained by decorating transition metal oxide nanoparticles with clusters of gold or platinum.

Pt Cluster auf einem  TiO2 Nanoteilchen
Pt cluster on TiO2 nanoparticles.

Micrograph taken from the paper:
D. Vollath, D. V. Szabó, in: Innovative Processing of Films and Nanocrystalline Powders, Imperial Press, London (2002) p. 219