Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 92: Nanostructures at surfaces: Dots, particles, clusters I

O 92.7: Talk

Thursday, March 15, 2018, 12:15–12:30, MA 141

In-situ investigation of metallic nanoparticle growth in a gas aggregation source — •Oleksandr Polonskyi, Alexander Vahl, Jonas Drewes, Alexander Hinz, Thomas Strunskus, and Franz Faupel — Chair for Multicomponent Materials, Faculty of Engineering, Kiel University, Germany

Metallic nanoparticles play an important role in the growing field of nanotechnology due to the unique properties associated with their small dimensions. Recently, so-called gas aggregation nanoparticle sources (GAS) (Haberland type, based on magnetron sputtering) have become very attractive for nanoparticle generation and they provide the ability to deposit various types of NPs with good control over size and size distribution. However, the processes inside the GAS are not fully understood yet, even though the GAS has often been used for generation of metallic clusters and nanoparticles. We report on the investigation of the initial stages of Ag nanoparticle growth in a gas phase by broadband transmission UV-Vis spectroscopy. We demonstrate that due to their strong particle plasmon resonance, small clusters and nanoparticles can be monitored by UV-Vis spectroscopy in-situ during growth and transport. We found that small clusters are already generated in the region close to the magnetron target surface and generally do not change their size much during transport through the gas aggregation chamber. Our measurements indicate that a high concentration of nanoparticles is located near the magnetron and results in strong coupling between neighboring particle plasmon resonances.