Sublimation and deposition behaviour of palladium (II) acetylacetonate

Sublimation and deposition of the metal-organic complex palladium (II) acet ylacetonate [Pd(acac)(2)] was investigated through thermogravimetry and XRD . The temperature range for sublimation, avoiding thermal decomposition, wa s determined to be 100-160 degreesC and required to take place in the prese nce of an inert gas such as helium. The complex was found to be highly unst able in the presence of hydrogen. The Clausius-Clapeyron equation determine d is ln P = 96 x 10(3)/RT + 29:26. Deposition of the complex on monolithic substrates required the presence of adsorption sites. For the system invest igated, change of the apparent deposition activation energy was found to ta ke place within the range 100-150 degreesC. To obtain Pd metal particles, t he precursor was reduced in hydrogen at a subsequent stage and temperatures close to room temperature were found to be sufficient.