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Sökning: WFRF:(Mårtensson Knut)

  • Resultat 1-10 av 43
  • [1]2345Nästa
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1.
  • Dick Thelander, Kimberly, et al. (författare)
  • Growth of GaP nanotree structures by sequential seeding of 1D nanowires
  • 2004
  • Ingår i: Journal of Crystal Growth. - : Elsevier. - 0022-0248. ; 272:1-4, s. 131-137
  • Tidskriftsartikel (refereegranskat)abstract
    • Complex nanostructures are becoming increasingly important for the development of nanoscale devices and functional nanomaterials. Precise control of size and morphology of these structures is critical to their fabrication and exploitation. We have developed a method for stepwise growth of tree-like nanostructures via the vapour liquid-solid (VLS) growth mode, demonstrated for III-V semiconductor materials. This method uses the initial seeding of nanowires by catalytic aerosol nanoparticles to form the trunk, followed by sequential seeding of branching structures. Here we present a detailed study of the growth of these complex structures using Gap. Diameter of each level of nanowires is directly determined by seed particle diameters, and number of branches is determined by seed particle density. Growth rate is shown to increase with temperature to a maximum corresponding to the temperature of complete decomposition of the Group-III precursor material, and subsequently decrease due to competition with bulk growth. Growth rate also depends on flow of the Group-III precursor, but not on the Group-V precursor. Finally, there is a relationship between the number of branches and their growth rate, suggesting that material diffusion plays a role in nanowire branch growth. (C) 2004 Elsevier B.V. All rights reserved.
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2.
  • Seifert, Werner, et al. (författare)
  • Growth of one-dimensional nanostructures in MOVPE
  • 2004
  • Ingår i: Journal of Crystal Growth. - : Elsevier. - 0022-0248. ; 272:1-4, s. 211-220
  • Tidskriftsartikel (refereegranskat)abstract
    • The use of metal organic vapor-phase epitaxy (MOVPE) for growth of one-dimensional nanostructures in the material systems GaAs, GaP, InAs and InP is investigated. Some kinetic effects are discussed, especially the general finding that in MOVPE thinner whiskers grow faster than thicker whiskers. Effects of growth temperature on growth rate and shape of the whiskers, the effects of different growth directions on the perfection of the materials and the possibilities to grow heterostructures in axial and lateral directions are reported. Ways to overcome the randomness in whisker growth by controlled seeding of the Au particles and by using lithography for site control are demonstrated.
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3.
  • Alce, Günter, et al. (författare)
  • Using VR for Fitness Training – Pilot Study
  • 2019
  • Ingår i: International Conference on Virtual Reality and Augmented Reality : 16th EuroVR International Conference, EuroVR 2019 Tallinn, Estonia, October 23–25, 2019 - 16th EuroVR International Conference, EuroVR 2019 Tallinn, Estonia, October 23–25, 2019. - : Springer. - 0302-9743 .- 1611-3349. - 9783030319076 - 9783030319083 ; 11883, s. 97-115
  • Konferensbidrag (refereegranskat)abstract
    • In the digitalized era, we do less and less physical work, which in turn leads to less physical activities. Many different wearables and applications try to motivate us to exercise more but people stop using them after a couple of months. One of the reasons people stop using them is because they serve as a post-activity viewing and not as a motivator. Meanwhile, the gaming industry has spent years of perfecting the art of creating addictive games. One idea is to utilize other technology such as virtual reality (VR) to encourage people to exercise more. VR is a computer-generated world, which tracks users and can give users an illusion of participating in a synthetic environment. This paper aims to introduce a Fitness VR application, which was developed and evaluated. The application contains three exercises and a mindfulness scene, the evaluation focus on how different gamification and interaction techniques can be used to motivate users to exercise more. Initial findings show that the participants find the Fitness VR application fun and motivating.
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  • Chen, Jianing, et al. (författare)
  • Surface-enhanced Raman scattering of rhodamine 6G on nanowire arrays decorated with gold nanoparticles
  • 2008
  • Ingår i: Nanotechnology. - : IOP Publishing. - 0957-4484. ; 19:27, s. 5-275712
  • Tidskriftsartikel (refereegranskat)abstract
    • We investigate the surface-enhanced Raman scattering (SERS) of rhodamine 6G (R6G) adsorbed on Au nanoparticles attached to InP nanowires. We find that nanowire arrays act as frameworks for effective SERS substrates with a significantly higher Raman signal sensitivity than a planar framework of Au nanoparticles adsorbed two-dimensionally on a flat surface. The SERS signal displays a clear polarization-dependent effect when the nanowires are arranged in a row. We also find that the SERS signal increases with time during continuous laser illumination. The plasmon-enhanced optical forces between Au nanoparticles may either move pairs of nanoparticles closer together or attract adsorbed molecules by moving them to the junctions of Au nanoparticle aggregates. Such effects by plasmon optical forces may cause the observed increase of the SERS signal with continuous laser illumination.
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6.
  • Deppert, Knut, et al. (författare)
  • Epitaxielle Kristallnadeln und -bäume
  • 2005
  • Ingår i: Book of abstracts: DGKK-Jahrestagung, Köln, Germany (2005).
  • Konferensbidrag (övrigt vetenskapligt)
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  • Resultat 1-10 av 43
  • [1]2345Nästa

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