The present invention relates to water-soluble, mono-, di- and multi-metallic metal-oxide colloids as well as to a method for representing the same and to their fixation on a carrier. This method is characterised in that the targeted synthesis of soluble metal-oxide colloids is achieved by the controlled hydrolysis of a noble metal precursor in the presence of a water-soluble stabiliser. The metal-oxide colloids can be reduced according to the needs into corresponding metal colloids. The fixation of the nanoparticles on the carrier can be carried out both at the oxidised state or reduced state of said nanoparticles.
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