AVS 52nd International Symposium
    Nanometer-Scale Science and Technology Thursday Sessions
       Session NS-ThA

Paper NS-ThA8
Photo-Induced Decomposition of Palladium Acetate for Palladium Nanoparticle Production

Thursday, November 3, 2005, 4:20 pm, Room 210

Session: Nano Processing
Presenter: C.E. Allmond, University of Virginia
Authors: C.E. Allmond, University of Virginia
A.T. Sellinger, University of Virginia
G. Peman, University of Virginia
J.M. Fitz-Gerald, University of Virginia
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Hydrocarbon reactions and rearrangements catalyzed by transition metals trigger chemical processes at the core of the petrochemical and polymer industries. The highly dispersed metal nanoparticles utilized for these reactions are generally prepared by reducing an aqueous solution of a noble metal salt or through the deposition of a precursor on a high surface area support followed by a further reduction step. Palladium acetate, [Pd(OAc)@sub 2@], is a widely favored metallorganic precursor for thin film processing on various substrates because it decomposes under ultraviolet irradiation. @footnote1@ @footnote2@ In this research, Pd and Pd acetate nanoparticles were deposited using a novel variation of matrix assisted pulsed laser evaporation (MAPLE). Samples were prepared by dissolving Pd(OAc)@sub 2@ into chloroform, then flash-frozen in liquid nitrogen. Deposition onto Si (100) wafers, NaCl crystals, and electron microscopy grids at room temperature was performed using a pulsed excimer laser (@lambda@ = 248 nm, 5 Hz, 25 ns FWHM) in a dynamic Ar atmosphere at 200 mTorr as a function of laser fluence and Pd metal loading. The nanoparticle sizes, distributions, and morphology of Pd and Pd acetate nanoparticles were characterized by high-resolution scanning electron microscopy (HRSEM), high-resolution transmission electron microscopy (HRTEM), X-ray energy dispersion spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). @FootnoteText@ Jun-Ying Zhang, Hilmar Esrom, Ian W. Boyd (1996). "Decomposition mechanisms of thin pall@footnote 1@adium excimer UV radiation." Applied Surface Science(96-98): 399-404. @footnote 2@Zsolt Geretovszky, Ian W. Boyd. (1999). "Kinetic study of 222 nm excimer lamp induced decomposition of palladium-acetate films." Applied Surface Science(138-139): 401-407.