A series of polymer-stabilized ruthenium nanoparticles with various dimensions are prepared by heating or refluxing a polyol solution of ruthenium(III) salts. The average diameters of Ru nanoparticles can be controlled in the range of 1.4-7.4 nm with relative standard deviations of less than 0.3 by changing the polyols, the reduction temperature and/or the amount of protective polymer. The larger ruthenium particles are obtained in the order of EGwDEGwTrEG, indicating that the slower reduction rate of Ru 3z ions is a decisive factor for obtaining larger particles. The ruthenium particle dimensions are dependent on the reduction temperature, nature of the media and the amount of protective polymer. Preparation of PVP-stabilized ruthenium colloids in polyol mediaTypically, in a 250 mL flask, PVP (0.8325 g, 7.5610 23 mol) and RuCl 3 ?nH 2 O (0.0371 g, 1.5610 24 mol) were dissolved in polyol solvent (150 mL) under stirring to form a dark red

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