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  • 1.
    Abbasi, Mazhar Ali
    et al.
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Hussain Ibupoto, Zafar
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Khan, Azam
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Nur, Omer
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Willander, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Fabrication of UV photo-detector based on coral reef like p-NiO/n-ZnO nanocomposite structures2013In: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 108, p. 149-152Article in journal (Refereed)
    Abstract [en]

    In this research work, a UV photo-detector is fabricated on fluorine doped tin oxide (FTO) glass substrate by exploiting the advantageous features of p-n heterojunctions based on p-NiO and n-ZnO composite nanostructures forming a coral-reef like structures. Scanning electron microscopy (SEM) and X-ray diffraction results showed uniform morphology and good crystal quality of the synthesised nanostructures respectively. I-V measurements have shown nonlinear and rectifying response of the p-NiO/n-ZnO heterojunction. The proposed photodiode exhibited excellent UV response with acceptable photocurrent generation of about 3.4 mA and the responsivity of 2.27 A/W at -3 biasing voltage.

  • 2.
    Ballem, Mohamed
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials . Linköping University, The Institute of Technology.
    Johansson, Emma
    Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials . Linköping University, The Institute of Technology.
    Cordoba Gallego, Jose Manuel
    Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials . Linköping University, The Institute of Technology.
    Odén, Magnus
    Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials . Linköping University, The Institute of Technology.
    Synthesis of hollow silica spheres SBA-16 with large-pore diameter2011In: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 65, no 7, p. 1066-1068Article in journal (Refereed)
    Abstract [en]

    Hollow silica SBA-16 spheres with cubic ordered mesoporous shells were synthesized by an emulsion-templating method, using Pluronic F127 as a structure-directing agent. tetraethyl orthosilicateas as a silica source and heptane as a cosolvent in the presence of NH4F. The size of these spheres is in the range of 10 to 30 mu m. The shell is about 700 nm thick and consists of large pores, similar to 9 nm in diameter, arranged in a cubic order. After calcination, the spheres maintain their mesoporosity and show a high surface area of 822 m(2)/g. The formation mechanism of the silica hollow spheres is discussed.

  • 3.
    Becker, Richard
    et al.
    Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
    Söderlind, Fredrik
    Linköping University, Department of Physics, Chemistry and Biology, Chemistry. Linköping University, Faculty of Science & Engineering.
    Liedberg, Bo
    Linköping University, Department of Physics, Chemistry and Biology, Molecular Physics. Linköping University, Faculty of Science & Engineering.
    Käll, Per-Olov
    Linköping University, Department of Physics, Chemistry and Biology, Chemistry. Linköping University, Faculty of Science & Engineering.
    Synthesis of silver nanowires in aqueous solutions2010In: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 64, no 8, p. 956-958Article in journal (Refereed)
    Abstract [en]

    Silver nanowires with a diameter of 30 nm and typical lengths of 5–10 μm have been synthesized in an aqueous medium. To initiate the reaction, citrate ions were used, and during the reaction the aromatic organicmolecules polymerize forming “straight” chain surfactants which support the formation of nanowires. Characterization by TEM and HRETM revealed the nanowires to be highly crystalline with a growth along the [110] direction.

  • 4.
    Boyd, Robert
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Plasma and Coating Physics. Linköping University, Faculty of Science & Engineering.
    Söderlind, Fredrik
    Linköping University, Department of Physics, Chemistry and Biology, Chemistry. Linköping University, Faculty of Science & Engineering.
    Helmersson, Ulf
    Linköping University, Department of Physics, Chemistry and Biology, Plasma and Coating Physics. Linköping University, Faculty of Science & Engineering.
    Odén, Magnus
    Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, Faculty of Science & Engineering.
    Pilch, Iris
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
    Complex 3D nanocoral like structures formed by copper nanoparticle aggregation on nanostructured zinc oxide rods2016In: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 184, p. 127-130Article in journal (Refereed)
    Abstract [en]

    This paper reports a new strategy for nanoparticle surface assembly so that they form anisotropic fibril like features, consisting of particles directly attached to each other, which can extend 500 nm from the surface. The particles are both formed and deposited in a single step process enabled via the use of a pulsed plasma based technique. Using this approach, we have successfully modified zinc oxide rods, up to several hundred nanometers in diameter, with 25 nm diameter copper nanoparticles for catalytic applications. The resulting structure could be modelled using a diffusion limited aggregation based approach. This gives the material the appearance of marine coral, hence the term nanocoral. (C) 2016 Elsevier B.V. All rights reserved.

  • 5.
    Choi, J H
    et al.
    Grenoble INP MINATEC, France LTM CNRS, France .
    Latu-Romain, L
    LTM CNRS, France .
    Bano, E
    Grenoble INP MINATEC, France .
    Henry, Anne
    Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
    Lee, W J
    Dong Eui University, South Korea .
    Chevolleau, T
    LTM CNRS, France .
    Baron, T
    LTM CNRS, France .
    Comparative study on dry etching of alpha- and beta-SiC nano-pillars2012In: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 87, p. 9-12Article in journal (Refereed)
    Abstract [en]

    Different polytypes (alpha-SiC and beta-SiC) and crystallographic orientations ((0001) and (11-20) of 6H-SiC) have been used in order to elaborate silicon carbide (SiC) nanopillars using the inductively coupled plasma etching method. The cross section of the SiC pillars shows a rhombus, pentagonal or hexagonal morphology depending on polytypes and crystallographic orientations. The favored morphologies of SiC nanopillars originate from a complex interplay between their polytypes and crystal orientations, which reflects the so-called Wulffs rule.

  • 6.
    Hens, Philip
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
    Jokubavicius, Valdas
    Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
    Liljedahl, Rickard
    Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
    Wagner, G
    Leibniz Institute for Crystal Growth, Max-Born-Strasse 2, D-12489 Berlin, Germany.
    Yakimova, Rositsa
    Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
    Wellmann, P
    Materials for Electronics and Energy Technology, University Erlangen-Nuremberg, Martensstrasse 7, D-91058 Erlangen, Germany.
    Syväjärvi, Mikael
    Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
    Sublimation growth of thick freestanding 3C-SiC using CVD-templates on silicon as seeds2012In: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 67, no 1, p. 300-302Article in journal (Refereed)
    Abstract [en]

    Cubic silicon carbide is a promising material for medium power electronics operating at high frequencies and for the subsequent growth of gallium nitride for more efficient light emitting diodes. We present a new approach to produce freestanding cubic silicon carbide (3C-SiC) with the ability to obtain good crystalline quality regarding increased domain size and reduced defect density. This would pave the way to achieve substrates of 3C-SiC so that the applications of cubic silicon carbide material having selectively (111) or (001) oriented surfaces can be explored. Our method is based on the combination of the chemical vapor deposition method and the fast sublimation growth process. Thin layers of cubic silicon carbide grown heteroepitaxially on silicon substrates are for the first time used for a subsequent sublimation growth step to increase layer thicknesses. We have been able to realize growth of freestanding (001) oriented 3C-SiC substrates using growth rates around 120 μm/h and diameters of more than 10 mm. The structural quality from XRD rocking curve measurements of (001) oriented layers shows good FWHM values down to 78 arcsec measured over an area of 1 × 2 mm2, which is a quality improvement of 2–3 times compared with other methods like CVD.

  • 7.
    Karlsson, L. H.
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
    Hallen, A.
    KTH Royal Institute Technology, Sweden.
    Birch, Jens
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
    Hultman, Lars
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
    Persson, Per O A
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
    Atomically resolved microscopy of ion implantation induced dislocation loops in 4H-SiC2016In: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 181, p. 325-327Article in journal (Refereed)
    Abstract [en]

    During high temperature electrical activation of ion-implanted dopant species in SiC, extrinsic dislocation loops are formed on the basal planes of the SiC lattice. Investigations have suggested Si-based loops are caused in accordance with the well-known +1 model. Herein we apply aberration corrected STEM to resolve the atomic structure of these loops. It is shown that the dislocation loops formed during annealing of Al-implanted SiC consist of an extra inserted Si-C bilayer of the (0001) polar sense, which upon insertion into the lattice causes a local extrinsic stacking fault. The +1 model thus needs to be expanded for binary systems. (C) 2016 Elsevier B.V. All rights reserved.

  • 8.
    Khan, Yagoob
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Chemistry. Linköping University, Faculty of Science & Engineering.
    Tajammul Hussain, Syed
    National Centre for Physics, Quaid-e-Azam University Campus, Islamabad, Pakistan.
    Abbasi, Mazhar Ali
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Käll, Per-Olov
    Linköping University, Department of Physics, Chemistry and Biology, Physical Chemistry. Linköping University, The Institute of Technology.
    Söderlind, Fredrik
    Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, The Institute of Technology.
    On the decoration of 3D nickel foam with single crystal ZnO nanorod arrays and their cathodoluminescence study2013In: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 90, p. 126-130Article in journal (Refereed)
    Abstract [en]

    Starting with an ammonical solution of zinc acetate, dense single crystal ZnO nanorod arrays were grown directly on high surface area porous 3D nickel foam substrates using a low temperature hydrothermal route. Heterogeneous nucleation of the nanorods with diameters around 100 nm can be conveniently and reproducibly Controlled by adjusting the amount of ammonia added to the growth solution. X-ray diffraction and HRTEM analysis confirmed the single phase wurtzite structure and c-axis orientation of the as grown ZnO nanorod arrays. Cathodoluminescence measurements indicate that the as-grown nanorod arrays were rich in atomic defects and gave strong orange emissions in the visible region. The nanorod arrays on unique 3D substrate are expected to improve the sensitivity and efficiency of ZnO based electrochemical sensors and heterogeneous catalysts.

  • 9.
    Khan, Yaqoob
    et al.
    National Centre for Nanotechnology, Department of Metallurgy and Materials Engineering, PIEAS, P.O. Nilore, Islamabad.
    Hussain, Sajjad
    Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, The Institute of Technology.
    Söderlind, Fredrik
    Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, The Institute of Technology.
    Käll, Per-Olov
    Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, The Institute of Technology.
    Abbasi, Mazhar Ali
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Durrani, Shahid Khan
    Pakistan Institute of Nuclear Science and Technology, P.O. Nilore, Islamabad.
    Honeycomb β-Ni(OH)2 films grown on 3D nickel foam substrates at low temperature2012In: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 69, p. 37-40Article in journal (Refereed)
    Abstract [en]

    A simple method is presented to grow thick honeycomb β-Ni(OH)2 films on 3D nickel foam substrates at80 °C using nickel sulfate and ammonia as the starting materials. The porous honeycomb network structureof the films with pore openings about 0.5–1 μm wide is built from seamlessly connected polycrystallinenanowalls, approximately 10–20 nm thick. The amount of ammonia added to the growth solution and thegrowth time were found to be critical parameters in determining the morphology and pore structure ofthe films. Air annealing of the as-prepared films resulted in polycrystalline NiO films with morphologiessimilar to those of their hydroxide precursors.

  • 10.
    Periyathambi, Prabu
    et al.
    Bio-Products Laboratory, Central Leather Research Institute, Adyar, Chennai 600020, Tamil Nadu, India.
    Vedakumari, Weslen S.
    Bio-Products Laboratory, Central Leather Research Institute, Adyar, Chennai 600020, Tamil Nadu, India.
    Baskar, Santhosh Kumar
    Bio-Products Laboratory, Central Leather Research Institute, Adyar, Chennai 600020, Tamil Nadu, India.
    Bojja, Sreedhar
    norganic and Physical Chemistry Division, Indian Institute of Chemical Technology, Hyderabad 500607, Andhra Pradesh, India.
    Sastry, Thotapalli P.
    Bio-Products Laboratory, Central Leather Research Institute, Adyar, Chennai 600020, Tamil Nadu, India.
    Osteogenic potency of magnetic fibrin nanoparticles—A novel perspective in bone tissue engineering2015In: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 139, p. 108-111Article in journal (Refereed)
    Abstract [en]

    In the present study, goat blood has been used as the starting material for the preparation of novel magnetic fibrin nanoparticles (MAG–FNPs) in tissue engineering. The synthesised nanoparticles were characterized by X-ray diffractometer (XRD), transmittance electron microscope (TEM), scanning electron microscope (SEM), Fourier Transform Infrared spectroscopy (FTIR), energy dispersive X-ray spectroscopy (EDX) and vibrating sample magnetometer (VSM) analysis. The osteogenic potential of MAG–FNPs was evaluated by performing cell viability assay and quantifying alkaline phosphatase (ALP) levels using Saos-2 cells. The results obtained suggested that MAG–FNPs could serve as promising biomaterial for bone tissue engineering.

  • 11.
    Peter, Hedström
    et al.
    Division of Engineering Materials, Luleå University of Technology.
    Ulrich, Lienert
    Argonne National Laboratory.
    Jon, Almer
    Argonne National Laboratory.
    Odén, Magnus
    Luleå University of Technology.
    Elastic strain evolution and ε-martensite formation in individual austenite grains during in situ loading of a metastable stainless steel2008In: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 62, no 2, p. 338-340Article in journal (Refereed)
    Abstract [en]

     The (hcp) ε-martensite formation and the elastic strain evolution of individual (fcc) austenite grains in metastable austenitic stainless steel AISI 301 has been investigated during in situ tensile loading up to 5% applied strain. The experiment was conducted using high-energy X-rays and the 3DXRD technique, enabling studies of individual grains embedded in the bulk of the steel. Out of the 47 probed austenite grains, one could be coupled with the formation of ε-martensite, using the reported orientation relationship between the two phases. The formation of ε-martensite occurred in the austenite grain with the highest Schmid factor for the active {111}b12¯1N slip system.

  • 12.
    Soomro, Muhammad Yousuf
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Nur, Omer
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Willander, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Enhancing the piezopotential from Zinc oxide (ZnO) nanowire usingp-type polymers2014In: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 124, p. 123-125Article in journal (Refereed)
    Abstract [en]

    We have investigated the effects of different p-type polymer layers on the piezoelectric potential from ZnO nanowire (NWs) grown on silver (Ag) coated silicon (Si) substrate by the low temperature chemical synthesis method. Piezoelectric measurement was performed by a conductive atomic force microscope (AFM). In the case of the poly(3,4-ethylenedioxythiophene-Tosylate (PEDOT-Tos), the output voltage is enhanced by about 95 mV, compared to 18 mV with the poly(3,4-ethylenedioxythiophene) oxidized with poly(4-styrenesulfonate) (PEDOT-PSS) layer. The enhancement in the output piezopotential was attributed to the reduction of the screening effect due to free charge carriers. It is suggested that the present method may be one of the best possible alternative ways to improve the piezo-potential output from ZnO NWs nanogenerators.

  • 13.
    Ul Hassan Alvi, Naveed
    et al.
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    ul Hassan, Wasied
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Farooq, B
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Nur, Omer
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Willander, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Influence of different growth environments on the luminescence properties of ZnO nanorods grown by the vapor-liquid-solid (VLS) method2013In: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 106, p. 158-163Article in journal (Refereed)
    Abstract [en]

    ZnO nanorods (NRs) are grown in different atmospheres (argon, air, oxygen and nitrogen) by using the vapor-liquid-solid (VLS) method. The influence of different growth atmospheres on the luminescence properties has been investigated by using the photoluminescence (PL), cathodoluminescence (CL) and electroluminescence (EL) spectra measurements at room temperature. The PL spectra investigations reveal that the air, the oxygen and the nitrogen growth atmospheres have strongly affected the oxygen interstitial (O-i) and oxygen vacancy (V-o) related deep level emission (DLE) bands in ZnO and this fact is also found consistent with the cathodoluminescence (CL) and electroluminescence (EL) spectra investigations. The color rendering investigations reveal that the growth atmospheres have also influenced the color quality of the emitted light. These results indicate that the defects related emissions from the band gap of ZnO NRs can be tuned by using different growth atmospheres. These results can be useful for the development of white light emitting diodes (WLEDs).

  • 14.
    Vasiliauskas, Remigijus
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
    Mekys, A.
    Institute of Applied Research, Vilnius University, LT 10222, Vilnius, Lithuania.
    Malinovskis, P.
    Institute of Applied Research, Vilnius University, LT 10222, Vilnius, Lithuania.
    Syväjärvi, Mikael
    Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
    Storasta, J.
    Institute of Applied Research, Vilnius University, LT 10222, Vilnius, Lithuania.
    Yakimova, Rositza
    Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
    Influence of twin boundary orientation on magnetoresistivity effect in free standing 3C–SiC2012In: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 74, p. 203-205Article in journal (Refereed)
    Abstract [en]

    Free standing 3C–SiC (111) samples with differently oriented twin boundaries were prepared using on-axis and slightly off-axis 6H–SiC substrates. The orientation of twin boundaries causes either an enhancement or suppression of the magnetoresistance mobility. The origin of carrier mobility difference is attributed to the specific structure of these defects. The height of the barriers created by twin boundaries was found to be 0.2 eV.

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