Browsing Det matematisk-naturvitenskapelige fakultet by Title

Now showing items 387-406 of 838

  • In-depth first-principle study on novel MoS 2 polymorphs 
    Eidsvåg, Håkon; Rasukkannu, Murugesan; Velauthapillai, Dhayalan; Vajeeston, Ponniah (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Molybdenum disulphide (MoS2) is a rising star among transition-metal dichalcogenides in photovoltaics, diodes, electronic circuits, transistors and as a photocatalyst for hydrogen evolution. A wide range of MoS2 polymorphs ...
  • In-situ electrodeposited Ag/Cu for electrochemical reduction of acetic acid to nanodiamond under ambient conditions 
    Hongrutai, N.; Nganglumpoon, R.; Watmanee, S.; Pinthong, P.; Szilagyi, Petra Agota; Titirici, M.-M.; Panpranot, J. (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2023)
    Carbon nanostructured materials such as nanodiamonds and graphene are useful for various applications, but their low-energy production technologies remain an important challenge to overcome. Herein, the electrochemical ...
  • 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 (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 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 ...
  • Inclusion of a cold hardening scheme to represent frost tolerance is essential to model realistic plant hydraulics in the Arctic-boreal zone in CLM5.0-FATES-Hydro 
    Lambert, Marius; Tang, Hui; Aas, Kjetil Schanke; Stordal, Frode; Fisher, Rosie; Fang, Yilin; Ding, Junyan; Parmentier, Frans-Jan W. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    As temperatures decrease in autumn, vegetation of temperate and boreal ecosystems increases its tolerance to freezing. This process, known as hardening, results in a set of physiological changes at the molecular level that ...
  • Increased Cu(II) Adsorption Onto UV-Aged Polyethylene, Polypropylene, and Polyethylene Terephthalate Microplastic Particles in Seawater 
    Han, Xiaoxin; Vogt, Rolf David; Zhou, Jiaying; Zheng, Boyang; Yu, Xue; Feng, Jianfeng; Lu, Xueqiang (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Environmental effects of microplastic are rather due to their adsorption capacity of contaminants than themselves. Aging is a key factor influencing adsorption properties of environmental microplastics. In order to clarify ...
  • Increasing the thermal expansion of proton conducting Y-doped BaZrO3 by Sr and Ce substitution 
    Dayaghi, Amir Masoud; Haugsrud, Reidar; Stange, Marit Synnøve Sæverud; Larring, Yngve; Strandbakke, Ragnar; Norby, Truls Eivind (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Proton conducting oxide electrolytes find potential application in proton ceramic fuel cells and electrolyzers operating at intermediate temperatures, e.g. 400–600 °C. However, state-of-the-art proton conducting ceramics ...
  • Increasing Trends of Legacy and Emerging Organic Contaminants in a Dated Sediment Core From East-Africa 
    Nipen, Maja; Vogt, Rolf David; Bohlin-Nizzetto, Pernilla; Borgå, Katrine; Mwakalapa, Eliezer Brown; Borgen, Anders; Schlabach, Martin; Christensen, Guttorm N; Mmochi, Aviti John; Breivik, Knut (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Temporal trends of industrial organic contaminants can show how environmental burdens respond to changes in production, regulation, and other anthropogenic and environmental factors. Numerous studies have documented such ...
  • Influence of a thin amorphous surface layer on de-channeling during aluminum implantation at different temperatures into 4H-SiC 
    Linnarsson, MK; Hallen, Anders; Vines, Lasse (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Ion implantation is an important technique in semiconductor processing and has become a key technology for 4H-SiC devices. Today, aluminum (Al) implantations are routinely used for p-type contacts, p+-emitters, terminations ...
  • Influence of annealing atmosphere on formation of electrically-active defects in rutile TiO2 
    Zimmermann, Christian; Bonkerud, Julie; Herklotz, Frank; Sky, Thomas Neset; Hupfer, Alexander; Monakhov, Eduard; Svensson, Bengt Gunnar; Vines, Lasse (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    Electronic states in the upper part of the bandgap of reduced and/or hydrogenated n-type rutile TiO2 single crystals have been studied by means of thermal admittance and deep-level transient spectroscopy measurements. The ...
  • Influence of Carbon Cap on Self-Diffusion in Silicon Carbide 
    Bathen, Marianne Etzelmüller; Linnarsson, Margareta; Ghezellou, Mizagh; Ul Hassan, Jawad; Vines, Lasse (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Self-diffusion of carbon (12C and 13C) and silicon (28Si and 30Si) in 4H silicon carbide has been investigated by utilizing a structure containing an isotope purified 4H-28Si12C epitaxial layer grown on an n-type (0001) ...
  • Influence of Defects and H2O on the Hydrogenation of CO2 to Methanol over Pt Nanoparticles in UiO-67 Metal-Organic Framework 
    Gutterød, Emil Sebastian; Pulumati, S.H.; Kaur, Gurpreet; Lazzarini, Andrea; Solemsli, B. G.; Gunnæs, Anette Eleonora; Ahoba-Sam, Christian; Kalyva, Maria Evangelou; Sannes, Johnny Andreas; Svelle, Stian; Skúlason, Egill; Nova, Ainara; Olsbye, Unni (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    In catalysts for CO2 hydrogenation, the interface between metal nanoparticles (NPs) and the support material is of high importance for the activity and reaction selectivity. In Pt NP-containing UiO Zr-metal–organic frameworks ...
  • Influence of Fermi level position on vacancy-assisted diffusion of aluminum in zinc oxide 
    Sky, Thomas Neset; Johansen, Klaus Magnus H; Venkatachalapathy, Vishnukanthan; Svensson, Bengt Gunnar; Tuomisto, Filip; Vines, Lasse (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    The influence of Fermi level position and annealing ambient on the zinc vacancy VZn generation and Al diffusion is studied in monocrystalline zinc oxide (ZnO). From secondary-ion mass spectrometry and positron annihilation ...
  • Influence of heat treatments in H2 and Ar on the E1 center in β-Ga2O3 
    Langørgen, Amanda; Zimmermann, Christian; Frodason, Ymir Kalmann; Verhoeven, Espen Førdestrøm; Weiser, Philip Michael; Karsthof, Robert Michael; Basile Varley, Joel; Vines, Lasse (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    The influence of heat treating [Formula: see text]-type bulk [Formula: see text]-Ga[Formula: see text]O[Formula: see text] in hydrogen (H[Formula: see text]) and argon (Ar) gases on the presence of the defect level commonly ...
  • Influence of hydrogen implantation on emission from the silicon vacancy in 4H-SiC 
    Bathen, Marianne Etzelmüller; Galeckas, Augustinas; Coutinho, José; Vines, Lasse (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    The silicon vacancy (VSi) in 4H-SiC is a room temperature single-photon emitter with a controllable high-spin ground state and is a promising candidate for future quantum technologies. However, controlled defect formation ...
  • Influence of metal assisted chemical etching time period on mesoporous structure in as-cut upgraded metallurgical grade silicon for solar cell application 
    Venkatesan, Ragavendran; Mayandi, Jeyanthinath; Pearce, Joshua M.; Venkatachalapathy, Vishnukanthan (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    In this work, upgraded metallurgical grade silicon (UMG-Si) wafer was used to fabricate mesoporous nanostructures, as an effective antireflection layer for solar photovoltaic cells. The length of the vertical Si nanostructure ...
  • Influence of Oxygen Pressure on Growth of Si-Doped beta-(AlxGa1-x)(2)O-3 Thin Films on c-Sapphire Substrates by Pulsed Laser Deposition 
    Hassa, Anna; von Wenckstern, Holger; Vines, Lasse; Grundmann, M (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Ga2O3 is a deep-UV transparent semiconducting oxide being interesting for solar-blind photo detectors e.g. for flame or missile plume detection. The bandgap of about 4.9 eV can be increased by alloying with Al2O3. We have ...
  • Influence of post-synthetic modifications on the composition, acidity and textural properties of ZSM-22 zeolite 
    Del Campo, Pablo; Beato, Pablo; Rey, Fernando; Navarro, Maria Teresa; Olsbye, Unni; Lillerud, Karl Petter; Svelle, Stian (Journal article / Tidsskriftartikkel / SubmittedVersion, 2018)
    In this work, an extensive investigation of the preparation of a large body of desilicated ZSM-22 zeolites and their basic characterization is presented. We investigate the effects of the properties of the starting zeolite, ...
  • Initial effective stress controls the nature of earthquakes 
    Passelègue, François X.; Almakari, Michelle; Dublanchet, Pierre; Barras, Fabian; Fortin, Jérôme; Violay, Marie (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Abstract Modern geophysics highlights that the slip behaviour response of faults is variable in space and time and can result in slow or fast ruptures. However, the origin of this variation of the rupture velocity ...
  • Innovative approach to controlled Pt–Rh bimetallic nanoparticle synthesis 
    Jensen, Martin; Gonano, Bruno Raymond Gino; Kierulf-Vieira, Walace; Kooyman, Patricia J.; Sjåstad, Anja Olafsen (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Precise control of the elemental composition and distribution in bimetallic nanoparticles is of great interest for both fundamental studies and applications, e.g. in catalysis. We present a new innovative and facile synthesis ...
  • Insights into Crystal Structure and Diffusion of Biphasic Na2Zn2TeO6 
    Li, Xinyu; Bianchini, Federico; Wind, Julia; Pettersen, Christine; Vajeeston, Ponniah; Wragg, David; Fjellvåg, Helmer (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    The layered oxide Na2Zn2TeO6 is a fast Na+ ion conductor and a suitable candidate for application as a solid-state electrolyte. We present a detailed study on how synthesis temperature and Na-content affect the crystal ...