Publications in Scientific Journals:
G. Feldbauer, M. Wolloch, P. Bedolla Velazquez, J. Redinger, A. Vernes, P. Mohn:
"Suppression of material transfer at contacting surfaces: the effect of adsorbates on Al/TiN and Cu/diamond interfaces from first-principles calculations";
Journal of Physics: Condensed Matter,
The effect of monolayers of oxygen (O) and hydrogen (H) on the possibility of material
transfer at aluminium/titanium nitride (Al/TiN) and copper/diamond (Cu/Cdia) interfaces,
respectively, were investigated within the framework of density functional theory (DFT).
To this end the approach, contact, and subsequent separation of two atomically flat surfaces
consisting of the aforementioned pairs of materials were simulated. These calculations
were performed for the clean as well as oxygenated and hydrogenated Al and Cdia surfaces,
respectively. Various contact configurations were considered by studying several lateral
arrangements of the involved surfaces at the interface. Material transfer is typically possible
at interfaces between the investigated clean surfaces; however, the addition of O to the Al and
H to the Cdia surfaces was found to hinder material transfer. This passivation occurs because
of a significant reduction of the adhesion energy at the examined interfaces, which can be
explained by the distinct bonding situations.
DFT, heterointerfaces, nanotribology, material transfer, adhesion, passivation, electronic structure
Created from the Publication Database of the Vienna University of Technology.