TiO2 nanotubes are prepared via the reaction of anatase TiO, powder with NaOH solution. Gold and gold-copper supported on TiO, nanotubes (Au/TiO, NTs and Au-Cu/TiO2 NTs) are synthesized by deposition-precipitation method. The prepared materials are characterized with BET, powder X-ray diffraction (XRD), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). Their catalytic performance for low-temperature CO oxidation is studied by using a microreactor-GC system. The influence of support, pH of HAuCl4 solution, calcination temperature and atmosphere as well as gold content on the catalytic performance of Au/TiO2 NTs are investigated. Compared with AU/TiO2 NTs, the catalytic performance of Au-Cu/TiO2 NTs is better. (c) 2006 Elsevier B.V. All rights reserved.