Abstract
We demonstrate a preparative method which produces highly monodisperse Pt-nanoparticles of tunable size without the external addition of seed particles. Hexachloroplatinic acid is dosed slowly to an ethylene glycol solution at 120 °C and reduced in the presence of a stabilizing polymer poly-N-vinylpyrrolidone (PVP). Slow addition of the Pt-salt will first lead to the formation of nuclei (seeds) which then grow further to produce larger particles of any desired size between 3 and 8 nm. The amount of added hexachloroplatinic acid precursor controls the size of the final nanoparticle product. TEM was used to determine size and morphology and to confirm the crystalline nature of the nanoparticles. Good reproducibility of the technique was demonstrated. Above 7 nm, the particle shape and morphology changes suddenly indicating a change in the deposition selectivity of the Pt-precursor from (100) towards (111) crystal faces and breaking up of larger particles into smaller entities.
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Acknowledgements
This work was supported by the Swiss National Science Foundation (SNF) and the Director, Office of Science, Office of Basic Energy Sciences, Division of Chemical Sciences, Geological and Biosciences of the U.S. Department of Energy under Contract DE-AC02=05CH11231. We would like to thank Dr. S. Brunner, Pitt Allmendinger and Manuel Hofer from the Zürich University of Applied Sciences, Winterthur for carrying out the reproducibility test experiment. We also thank Dr. Christian Soltmann for assistance with the CM30 Transmission Electron Microscope and Michael Foxe for support with the initial hydrogen reduction experiments.
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Koebel, M.M., Jones, L.C. & Somorjai, G.A. Preparation of size-tunable, highly monodisperse PVP-protected Pt-nanoparticles by seed-mediated growth. J Nanopart Res 10, 1063–1069 (2008). https://doi.org/10.1007/s11051-008-9370-7
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DOI: https://doi.org/10.1007/s11051-008-9370-7