Research is carried out in the following areas:
- Growth and characterisation of 2D materials
- Interactions and structures of adsorbate species on metal surfaces
- Surface and near surface characterization of oxide materials, nanoparticles and ‘real’ catalysts.
Graphene and other 2D nanostructures
Graphene is a one atomic thick sheet of carbon atoms featuring a honeycomb structure. It has several interesting properties both mechanically and electronically.
These studies have been performed in close collaboration with the Atomic Scale Physics group. The adjacent image shows the moire structure of single layer of graphene on Ir(111) surface studied with LEED I(V) and AFM measurements that yield the local surface topography with pm accuracy.
Ordered structures of adsorbed molecules on single crystal surfaces
With these studies we aim to increase the understanding of catalytic systems. Adsorption of CO has been studied on metal surfaces and known catalytic promoters and poisons hase been added to change the adsorption behaviour and structure. Typically the system has been studied with XPS and LEED I(V) measurements to give chemical and structural information. The adjacent image shows the adsorption structure of clusters consisting of 14 P-atoms on Pt(111) surface.
Surface characterisation with ESCA
Electron spectroscopy for chemical analysis (ESCA, XPS) is a standard tool for studying the chemical composition of the first few atomic layers of solid material. We have used the method to study a large variety of samples from our collaborators; these include e.g. car exhaust catalysts from Environmental and Chemical Engineering at Oulu University, carbon nano structures from e.g. NanoMaterials group, light emitting silica particles, etc.