Synthesis And Morphology Study Of Ruthenium Nanoclusters

This thesis is focused on the preparation and morphology control of polymer-stabilized Ru nanoparticles. It is mainly composed of the following three parts:1 A review was given on the special properties and preparation of metal nanoclusters as well as their application in catalysis. In addition, a detailed introduction was made to the morphology study of metal nanoparticles.2 A new route to the preparation of poly (N-vinyl-2-pyrrolidone) (PVP)-stabilized ruthenium colloids by refluxing ruthenium(III) chloride in low boiling point alcohols was developed. A series of Ru nanoparticles were obtained with the average diameters varying in the range of 1.2-1.6 nm with relative standard deviations of less than 0.33. The effect of different preparation conditions on the diameters and distribution of polymer-stabilized Ru colloids was investigated by altering the molar ratio of PVP : Ru, taking solvent purification, accepting inertia gas protection, and so on. Under the preparation of refluxing, the diameters of the ruthenium colloids increased with the decrease of the molar ratio of protective polymer-PVP, indicting that the amount of protective polymer used is an important factor controlling the diameter of metal nanoparticles.3 In this report, we describe a method for the synthesis of ruthenium particles with controllable shuttle-like shapes. By increasing the concentration of Ru3+ in the reaction solution, we can obtain a transparent deep purple colloidal solution of ruthenium particles which consists of two microstructues, one is large shuttle-like ruthenium particles with the lengths ranged from 149 nm to 659 nm, and the other is tiny Ru Colloids with the average diameter of 1.9 nm. TEM, XRD and UV-visible absorption spectrophotometry were introduced to study the morphology of the colloids.