A hydroxyapatite/titania composite (HAp/TiO
2) film was developed for application in air purification and as an antibacterial, antifouling film. This HAp/TiO
2 film has the ability for adsorbing and decomposing organic matter. To obtain the HAp/TiO
2 film, we used two kinds of aerosol beams. They were composed of TiO
2 and HAp particles accelerated by flow of helium gas, respectively. First layer, TiO
2 film, was formed on a glass plate with a TiO
2 aerosol beam. Second layer, HAp film, was created on the first layer, TiO
2 film. Neither the substrate nor HAp and TiO
2 particles were heated during deposition. Acetaldehyde concentration reduced by the HAp/TiO
2 film was measured to evaluate the film's ability for adsorbing and decomposing organic matter.
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