Department of Chemical Engineering, University College London, Torrington Place, London, WC1E 7JE, UK
Sublimation and deposition of the metal-organic complex palladium (II) acetylacetonate [ Pd(acac)2] was investigated through thermogravimetry and XRD. The temperature range for sublimation, avoiding thermal decomposition, was determined to be 100−160 °C and required to take place in the presence of an inert gas such as helium. The complex was found to be highly unstable in the presence of hydrogen. The Clausius-Clapeyron equation determined is . Deposition of the complex on monolithic substrates required the presence of adsorption sites. For the system investigated, change of the apparent deposition activation energy was found to take place within the range 100−150 °C. To obtain Pd metal particles, the precursor was reduced in hydrogen at a subsequent stage and temperatures close to room temperature were found to be sufficient.
(Received May 23 2000)
(Revised March 2 2001)
(Accepted March 27 2001)
(Online publication July 15 2001)