Papers by Reine Wallenberg
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Solid State Ionics, Sep 1, 2014
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Journal of Controlled Release, Jul 1, 2004
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Physica C-superconductivity and Its Applications, Nov 1, 1992
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Journal of Crystal Growth, Feb 1, 1987
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Nano Letters, Dec 22, 2017
Semiconductors are essential for modern electronic and optoelectronic devices. To further advance... more Semiconductors are essential for modern electronic and optoelectronic devices. To further advance the functionality of such devices, the ability to fabricate increasingly complex semiconductor nanostructures is of utmost importance. Nanowires offer excellent opportunities for new device concepts; heterostructures have been grown in either the radial or axial direction of the core nanowire but never along both directions at the same time. This is a consequence of the common use of a foreign metal seed particle with fixed size for nanowire heterostructure growth. In this work, we present for the first time a growth method to control heterostructure growth in both the axial and the radial directions simultaneously while maintaining an untapered self-seeded growth. This is demonstrated for the InAs/InAs1-xPx material system. We show how the dimensions and composition of such axio-radial nanowire heterostructures can be designed including the formation of a "pseudo-superlattice" consisting of five separate InAs1-xPx segments with varying length. The growth of axio-radial nanowire heterostructures offers an exciting platform for novel nanowire structures applicable for fundamental studies as well as nanowire devices. The growth concept for axio-radial nanowire heterostructures is expected to be fully compatible with Si substrates.
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Thin Solid Films, Sep 1, 1993
ABSTRACT Cross-sectional transmission electron microscopy (XTEM), including high-resolution micro... more ABSTRACT Cross-sectional transmission electron microscopy (XTEM), including high-resolution microscopy (HREM), was employed to characterize the interface between different amorphous hydrogenated carbon (a-C:H) films and steel substrates. Additional analyses using Auger electron spectroscopy (AES) and X-ray diffraction (XRD) were also performed. Films were deposited both by high-energy (50 keV) nitrogen ion-beam decomposition of large hydrocarbon molecules and by magnetron plasma decomposition of C2H2 in mixed Ar-C2H2 discharges. The latter method was also used to deposit Mo- or W-containing a-C:H films (Me-C:H films) onto steel substrates with interlayers of the pure metals between the substrate and Me-C:H film. The films were found to be truly amorphous except for the cases of the metal-containing films, where 1–2 nm crystalline clusters were present in an a-C:H matrix. In the case of Mo the clusters were identified from HREM micrographs to have a bcc-like structure, characteristic of metallic Mo. The metal interlayers had a columnar microstructure with column widths of ∼ 30 nm. The interfaces between the Mo and W interlayers and the a-C:H films were found to extend over 20–40 nm with a gradual crystalline-to-amorphous transition. In most of the a-C:H film-substrate interface regions a thin layer ( < 10 nm) was observed which was predominantly amorphous but contained a small fraction of crystalline grains. AES showed an increase of both O and N close to the interface. However, for the cases with Mo and W interlayers, the substrate surface contaminants were less localized, and on some parts of the substrate surface the lattice fringes of the substrate and metal interlayer phase were continuous across a sharp interface.
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Catalysis Science & Technology
Finding alternative and sustainable ways to produce, store and convert energy is key for reducing... more Finding alternative and sustainable ways to produce, store and convert energy is key for reducing fossil fuel-based CO2 emissions.
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Results in Chemistry, 2021
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ACS Applied Electronic Materials, 2020
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ACS Nano, 2020
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Nano Letters, 2019
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Nano Letters, 2019
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Catalysis Science & Technology, 2019
In situ XAS is used to reveal the evolution of palladium species during an undirected C–H acetoxy... more In situ XAS is used to reveal the evolution of palladium species during an undirected C–H acetoxylation reaction.
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Journal of Physics C: Solid State Physics, 1988
... I4/mmm is a symmorphic space group with rotational symmetry elements given by 4 m -&q... more ... I4/mmm is a symmorphic space group with rotational symmetry elements given by 4 m -"={E,i,C~z,S~z,C2r,C2y,CZz,ox,oy, oz,C2n,C2b,oda,odb} for the standard choice of origin. (SeeBradley and Cracknell(l972) for the notation and definition of these symmetry elements. ...
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Journal of the Less Common Metals, 1989
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Carbon, 2016
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Applied Catalysis A: General, 2015
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Nano Letters, 2013
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orbit.dtu.dk, 2010
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Papers by Reine Wallenberg