Large scale production and characterisation of novel catalysts based on bimetallic deposited clusters
In the last decades multi-atomic systems in the nano-scale have increased more and more interest among researchers, for their properties explain a transition from single atoms to solid-state. In addition, due to their high surface to volume ratio, they are widely applied in catalysis or sensing, and due to electron confinement they find new applications in optics and electronic devices as well. The applicability and reproducibility on a large scale and convenient way of the exciting results obtained in many laboratories is waiting for new technologies and the realization of new production systems.
My PhD will be centred in the realization of a new cluster-beam system. Clusters will be produced on a large scale via a sputtering process of a target and via a gas-condensation process inside a condensation chamber. An ionized cluster-beam will be formed after a supersonic expansion through a nozzle and the subsequent application of high voltages to a system of eizen lenses. The cluster-beam can be bended downwards or laterally in order to deposit clusters in different chambers, even on powder substrates.
With the combination of simulations and experiments it will be exploited a wide range of sputter configurations and an aerodynamic study of the chamber shape will help to increase the cluster throughput. To do so a preliminary study of cluster nucleation and coagulation is needed. Furthermore, high loading mono and bi-metallic cluster deposition will be performed on powder substrates, and such samples will be characterized morphologically and their catalytic performances will be analysed.