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Abstract: Gold nanoparticles supported on carbon nanotubes (CNTs) were obtained by using electroless plating technique. High-resolution transmission electron microscopy evidenced the high-density and homogeneous dispersion of spherical gold nanoparticles on the outer surfaces of the carbon nanotubes, with a sharp particle size distribution centered at around 3–4 nm of diameter. The resultant hybrid nanostructures have potential application for being used as novel gold nanocatalysts. [Copyright &y& Elsevier]