We prepared gold-titania composite nanoparticles by the gas condensation me
thod, and evaluated their physical and optical characteristics. The structu
re of obtained particles mainly showed that the gold particles, whose diame
ter ranged from 10 to 60 nm, were covered with spherical titania particles
which were composite phases of anatase and rutile. The effect on the crysta
l structure and shapes of titania was not clearly observed by compounding w
ith gold.