I work as a scientist at SINTEF Materials physics in Oslo. Here I am investigating the material properties of all types of materials, from steel for construction, polymers, catalyst materials for CO2 storage, to semiconductor thin films for solar cells, using advanced characterization equipment. My passion is to investigate and develop new materials for renewable energy.
In a project at SINTEF we developed a method to produce 3-d imensional nanostructures of silicon and aluminum, particles, nano-wires and nano-tunnels, using a self-organizing process. These structures can potentially be used in solar cells, sensors, batteries, and thermoelectric elements that generate electrical power by heat.
Latest publications from NanoSol:
T. Kjeldstad, A Thøgersen, M Stange, A Azarov, E Monakhov and A Galeckas. Monitoring selective etching of self-assembled nanostructured a-Si:Al films. Nanotechnology 30 (2019) 135601
Torunn Kjeldstad, Annett Thøgersen, Marit Stang, Ingvild Thue Jensen, Eduard Monakhov, and Augustinas Galeckas. Surface Effects and Optical Properties of Self-Assembled Nanostructured a-Si:Al. Nanomaterials 2019, 9(8), 1106.
Annett Thøgersen, Ingvild J T Jensen, Marit Stange, Arne Røyset, Ole Martin Løvvik, Alexander G Ulyashin and Spyros Diplas Valence charge distribution in homogenous silicon-aluminium thin-filmsJournal of Physics: Condensed Matter, Volume 30, Number 33 (2018)
Annett Thøgersen, Ingvild J T Jensen, Marit Stange, Torunn Kjeldstad, Diego Martinez-Martinez, Ole Martin Løvvik, Alexander G Ulyashin and Spyros Diplas Formation of nanoporous Si upon self-organized growth of Al and Si nanostructuresNanotechnology, Volume 29, Number 31 (2018)
Kjeldstad, T., Thøgersen, A., Nilsen, O., Monakhov, E. and Galeckas, A. Controllable template approach for ZnO nanowire growth.Phys. Status Solidi A, 214: n/a, 1600480 (2017)
Annett Thøgersen, Marit Stange, Ingvild J. T. Jensen, Arne Røyset, Alexander Ulyashin and Spyros Diplas. Structure and optical properties of aSiAl and aSiAlHx magnetron sputtered thin films. APL Materials, 4, 036103 (2016)
Our PhD student Torunn Kjeldstad has participated in Forsker Grand Prix 2017, and she won the regional final and participated in the national final. Here is her presentation at the regional final, and a page about her research.
In the project HIPP we develop a model framework which describes and couples environment-assisted hydrogen degradation mechanisms at different length and time scales towards a predictive mechanism-based integrity assessment approach for oil and gas steel infrastructure.
Latest publications from HIPP:
Domas Birenis, Yuhei Ogawa, Hisao Matsunaga, Osamu Takakuwa, Junichiro Yamabe, Øystein Prytz, AnnettThøgersen. Hydrogen-assisted crack propagation in α-iron during elasto-plastic fracture toughness tests. Materials Science and Engineering: A
Volume 756, 22 May 2019, Pages 396-404.
Domas Birenis, Yuhei Ogawa, Hisao Matsunaga, Osamu Takakuwa,
Junichiro Yamabe, Øystein Prytz, Annett Thøgersen.Interpretation of hydrogen-assisted fatigue crack propagation in BCC iron based on dislocation structure evolution around the crack wake. Acta Materialia Volume 156, 1 September 2018, Pages 245-253
Yuhei Ogawa, Domas Birenis, Hisao Matsunaga, Osamu Takakuwa, Junichiro Yamabe, Øystein Prytz, and Annett Thøgersen.The role of intergranular fracture on hydrogen-assisted fatigue crack propagation in pure iron at a low stress intensity range. Materials Science and Engineering: A Volume 733, 22 August 2018, Pages 316-328
Yuhei Ogawa, Domas Birenis, Hisao Matsunaga, Annett Thøgersen, Øystein Prytz, Osamu Takakuwa, Junichiro Yamabe.Multi-scale observation of hydrogen-induced, localized plastic deformation in fatigue-crack propagation in a pure iron. Scripta Materialia 140 (2017) 13–17