Authors: CE Allmond AT Sellinger K Gogick JM FitzGerald
Publish Date: 2006/12/13
Volume: 86, Issue: 4, Pages: 477-480
Abstract
Highly dispersed nanoparticles of transition and noble metals are utilized for hydrocarbon reactions and rearrangements important to the chemical industry The need to obtain 1 to 3 nm particles with narrow size distributions has prompted the development of alternative processing methods In this paper a novel dry method to synthesize nanoparticles from a frozen salt solution is reported Pd nanoparticles were synthesized by photochemical decomposition of palladium acetate PdAc within a host matrix of chloroform using an excimer laser operating at 248 nm Frozen composite targets were ablated at fluences ranging from 025 J/cm2 to 075 J/cm2 at a processing pressure of 10 mTorr The ejected nanoparticles were deposited on continuous carbon coated and lacey carbon transmission electron microscopy TEM grids at ambient temperature Characterization was performed by transmission electron microscopy TEM and energy dispersive Xray spectroscopy EDXS Highresolution TEM analysis showed definitive evidence that the size distributions of the nanoparticles were narrow exhibiting mean diameters ranging from 215 nm to 262 nm
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