Surface Science

The Surface Science group studies structures, bonding, and reactivity at solid surfaces on the atomic and molecular scale using advanced surface sensitive tools in Ultra High Vacuum environment. This knowledge is utilized to understand macroscopic behavior of nanostructures and surface phenomena like heterogeneous catalysis and adhesion.
Surface science

Group leader

Dr. Jouko Lahtinen

Research is carried out in the following areas:

  • Structural and chemical characterization of nanomaterials
  • Interactions and structures of adsorbate species on metal surfaces
  • Surface and near surface characterization of oxide materials, nanoparticles and ‘real’ catalysts.

Research

The Surface Science group studies:

  • 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.

Facilities

The Surface Science research group has three multi-technique ultra-high vacuum (UHV) systems located in Nanotalo.

Kratos Axis Ultra ESCA system

The system is an X-ray Photoemission Spectrometer (XPS, ESCA) enabling elemental concentrations,chemical state identification and chemical state mapping of the surface. The system contains a dual anode (Mg and Al Kα source) and a monochromated Al Kα source. The analysis area varies from 110 μm down to 15 μm, and he ultimate lateral resolution is 5 μm. There is also an He-source enabling Ultraviolet Photoemission Spectroscopy (UPS).

Ar Gas Cluster Ion Source (GCIS) capable of generating Ar cluster size up to 2000 atoms. The cluster source enables depth profiling of both hard and soft materials. The ion source also enables Low Energy Ion Scattering Spectrocopy (LEISS).

STM & XPS

The system is a self-combined collection consisting of 

  • Surface Science SSX-100 electron energy analyzer and monochromatic X-ray source
  • Omicron VT SPM variable temperature scanning tunneling microscope
  • SPECTALEED reverse view LEED-optics for low energy electron diffraction (LEED)
  • evaporation systems for sample preparation in vacuum.

LEED & PM-IRRAS

This is another self-combined system consisting of

  • Perkin Elmer PHI 3057 XPS system with a dual anode (Mg and Al Kα) X-ray source and an electron energy analyzer.

  • Princeton Research Instruments reverse view LEED-optics
  • Bruker Polarization Modulated Ifrared Absorption Spectroscopy (PM-IRRAS)

Latest publications

Department of Applied Physics, NanoMaterials, Surface Science

Roles of sulfur in floating-catalyst CVD growth of single-walled carbon nanotubes for transparent conductive film applications

Publishing year: 2019 Chemical Engineering Journal
Surface Science, Department of Applied Physics

Noble copper-silver-gold trimetallic nanobowls

Publishing year: 2019 Journal of Colloid and Interface Science
Department of Chemical and Metallurgical Engineering, Catalysis, School common, CHEM, Surface Science, Department of Applied Physics

Nickel Supported on Mesoporous Zirconium Oxide by Atomic Layer Deposition

Publishing year: 2019 Topics in Catalysis
Department of Applied Physics, Soft Matter and Wetting, Biomolecular materials, Department of Bioproducts and Biosystems, Active Matter, Surface Science, NanoMaterials, Molecular Materials

Highly Luminescent Gold Nanocluster Frameworks

Publishing year: 2019 ADVANCED OPTICAL MATERIALS
Ilkka Tittonen Group, Department of Electronics and Nanoengineering, Surface Science, Department of Applied Physics

Size- and density-controlled photodeposition of metallic platinum nanoparticles on titanium dioxide for photocatalytic applications

Publishing year: 2019 Journal of Materials Chemistry A
Department of Applied Physics, Surface Science

Microstructural characteristics of vehicle-aged heavy-duty diesel oxidation catalyst and natural gas three-way catalyst

Publishing year: 2019 CATALYSTS
Electrochemical Energy Conversion, Department of Chemistry and Materials Science, Department of Applied Physics, Surface Science, NanoMaterials

Catalyst Support Effect on the Activity and Durability of Magnetic Nanoparticles

Publishing year: 2018 ACS Applied Materials and Interfaces
Physical Charactristics of Surfaces and Interfaces, Department of Chemistry and Materials Science, Computational Chemistry, Department of Bioproducts and Biosystems, Bio-based Colloids and Materials, Department of Applied Physics, Surface Science, NanoMaterials, Electrochemical Energy Conversion

Experimental and Computational Investigation of Hydrogen Evolution Reaction Mechanism on Nitrogen Functionalized Carbon Nanotubes

Publishing year: 2018 ChemCatChem
Department of Applied Physics, Surface Science

One-Pot Synthesis of Au Embedded ZnO Nanorods Composite Heterostructures with Excellent Photocatalytic Properties

Publishing year: 2018 ChemistrySelect
Department of Chemistry and Materials Science, Advanced and functional Materials, Surface Science, Department of Applied Physics

Titania nanotubes prepared by rapid breakdown anodization for photocatalytic decolorization of organic dyes under UV and natural solar light

Publishing year: 2018 Nanoscale Research Letters
More information on our research in the Research database.
Research database

Research group members

Jouko Lahtinen

Jouko Lahtinen

Department of Applied Physics
Senior University Lecturer
Jani Sainio

Jani Sainio

Department of Applied Physics
Senior University Lecturer
  • Published:
  • Updated:
Share
URL copied!