Browsing SINTEF Open by Author "Thøgersen, Annett"
Now showing items 1-14 of 14
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Cubic silicon carbide as a potential photovoltaic material
Syväjärvi, Mikael; Ma, Quanbao; Jokubavicius, Valdas; Galeckas, Augustinas; Sun, Jianwu; Liu, Xinyu; Jansson, Mattias; Wellmann, Peter; Linnarsson, Margareta; Runde, Paal; Johansen, Bertil; Thøgersen, Annett; Diplas, Spyridon; Carvalho, Patricia; Løvvik, Ole Martin; Wright, Daniel Nilsen; Azarov, Alexander; Svensson, Bengt Gunnar (Peer reviewed; Journal article, 2016)In this work we present a significant advancement in cubic silicon carbide (3C-SiC) growth in terms of crystal quality and domain size, and indicate its potential use in photovoltaics. To date, the use of 3C-SiC for ... -
Hydrogen-assisted crack propagation in α-iron during elasto-plastic fracture toughness tests
Birenis, Domas; Ogawa, Yuhei; Matsunaga, Hisao; Takakuwa, Osamu; Yamabe, Junichiro; Prytz, Øystein; Thøgersen, Annett (Journal article; Peer reviewed, 2019)Elasto-plastic fracture toughness tests of a commercially pure iron were performed in air and in hydrogen gas at two different pressures. Some unique characteristics of hydrogen-enhanced cracking were exhibited at both the ... -
Hydrogen-assisted fatigue crack propagation in a pure BCC iron. Part I: Intergranular crack propagation at relatively low stress intensities
Ogawa, Yuhei; Birenis, Domas; Matsunaga, Hisao; Takakuwa, Osamu; Yamabe, Junichiro; Prytz, Øystein; Thøgersen, Annett (Peer reviewed; Journal article, 2018) -
Hydrogen-assisted fatigue crack propagation in a pure BCC iron. Part II: Accelerated regime manifested by quasi-cleavage fracture at relatively high stress intensity range values
Birenis, Domas; Ogawa, Yuhei; Matsunaga, Hisao; Takakuwa, Osamu; Yamabe, Junichiro; Prytz, Øystein; Thøgersen, Annett (Peer reviewed; Journal article, 2018)Hydrogen effect on fatigue performance at relatively high values of stress intensity factor range, ΔK, of pure BCC iron has been studied with a combination of various electron microscopy techniques. Hydrogen-assisted fatigue ... -
In-situ electron loss spectroscopy reveals surface dehydrogenation of hydrated ceria nanoparticles at elevated temperatures
Thøgersen, Annett; Sun, Xinwei; Jensen, Ingvild Julie Thue; Prytz, Øystein; Norby, Truls (Peer reviewed; Journal article, 2022)Ceria (CeO2) exhibits high reversible oxygen storage capacity at intermediate temperatures (500–800 °C) related to an extraordinary and not fully understood reduction of its surfaces. We have investigated pristine and ... -
Interpretation of hydrogen-assisted fatigue crack propagation in BCC iron based on dislocation structure evolution around the crack wake
Birenis, Domas; Ogawa, Yuhei; Matsunaga, Hisao; Takakuwa, Osamu; Yamabe, Junichiro; Prytz, Øystein; Thøgersen, Annett (Peer reviewed; Journal article, 2018)A new model for hydrogen-assisted fatigue crack growth (HAFCG) in BCC iron under a gaseous hydrogen environment has been established based on various methods of observation, i.e., electron backscatter diffraction (EBSD), ... -
Investigation of veryintenseD3-band emission in multi-crystalline silicon wafers using electron microscopy and hyperspectral photoluminescence imaging
Thøgersen, Annett; Jensen, Ingvild Julie Thue; Graff, Joachim Seland; Ringdalen, Inga Gudem; Almeida Carvalho, Patricia; Mehl, Torbjørn; Zhu, Junjie; Burud, Ingunn; Olsen, Espen; Søndenå, Rune (Peer reviewed; Journal article, 2022)Defects in high performance multi-crystalline silicon wafers can be detrimental to the lifetime of the solar cell. It is, therefore, important to study and understand the underlying structure and chemical elements present ... -
Multi-scale observation of hydrogen-induced, localized plastic deformation in fatigue-crack propagation in a pure iron
Ogawa, Yuhei; Birenis, Domas; Matsunaga, Hisao; Thøgersen, Annett; Prytz, Øystein; Takakuwa, Osamu; Yamabe, Junichiro (Peer reviewed; Journal article, 2017)In order to study the influence of hydrogen on plastic deformation behavior in the vicinity of the fatigue crack-tip in a pure iron, a multi-scale observation technique was employed, comprising electron channeling contrast ... -
Multi-scale observation of hydrogen-induced, localized plastic deformation in fatigue-crack propagation in a pure iron
Ogawa, Yuhei; Birenis, Domas; Matsunaga, Hisao; Thøgersen, Annett; Prytz, Øystein; Takakuwa, Osamu; Yamabe, Junichiro (Peer reviewed; Journal article, 2017)In order to study the influence of hydrogen on plastic deformation behavior in the vicinity of the fatigue crack-tip in a pure iron, a multi-scale observation technique was employed, comprising electron channeling contrast ... -
Plasmonic properties of aluminium nanowires in amorphous silicon
Thøgersen, Annett; Jensen, Ingvild Julie Thue; Belle, Branson Delano; Stange, Marit Synnøve Sæverud; Reinertsen, Vilde Mari; Kjeldstad, Torunn; Prytz, Øystein; Monakhov, Eduard; Kepaptsoglou, Demie (Peer reviewed; Journal article, 2022)Plasmonic structures can help enhance optical activity in the ultraviolet (UV) region and therefore enhancing photocatalytic reactions and the detection of organic and biological species. Most plasmonic structures are ... -
Selective etching of nanostructured a-Si:Al and its effect on porosity, Al gradient and surface oxidation
Kjeldstad, Torunn; Thøgersen, Annett; Stange, Marit Synnøve Sæverud; Jensen, Ingvild Julie Thue; Nilsen, Ola; Galeckas, Augustinas; Monakhov, Eduard (Peer reviewed; Journal article, 2020)Nanoporous amorphous silicon (a-Si) with <5 nm cylindrical pores have been fabricated by phase separation of aluminum (Al) and silicon, forming self-assembled Al nanowires (NWs), followed by subsequent removal of Al by wet ... -
Short-Range Structure of Ti0.63V0.27Fe0.10D1.73 from Neutron Total Scattering and Reverse Monte Carlo Modelling
Mauroy, Henrik; Klyukin, Konstantin; Shelyapina, Marina G.; Keen, David A.; Thøgersen, Annett; Hauback, Bjørn; Sørby, Magnus Helgerud (Peer reviewed; Journal article, 2020)Ti-V-based body-centered cubic (BCC) alloys have potential for large-scale hydrogen storage if expensive vanadium is substituted with much cheaper Fe-containing ferrovanadium. Use of ferrovanadium reduces the alloys’ ... -
Surface effects and optical properties of self-assembled nanostructured a-Si:Al
Kjeldstad, Torunn; Thøgersen, Annett; Stange, Marit Synnøve Sæverud; Jensen, Ingvild Julie Thue; Monakhov, Eduard; Galeckas, Augustinas (Journal article; Peer reviewed, 2019)We present a study of the surface effects and optical properties of the self-assembled nanostructures comprised of vertically aligned 5 nm-diameter Al nanowires embedded in an amorphous Si matrix (a-Si:Al). The controlled ... -
Valence charge distribution in homogenous silicon-aluminium thin-films
Thøgersen, Annett; Jensen, Ingvild Julie Thue; Stange, Marit Synnøve Sæverud; Røyset, Arne Karstein; Løvvik, Ole Martin; Ulyashin, Alexander; Diplas, Spyridon (Peer reviewed; Journal article, 2018)Homogenous aSi1−xAlxHy alloyed thin films, made by magnetron sputtering, has been found to exhibit tunable band gap and dielectric constant depending on their composition. The optical properties of alloys are largely defined ...