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5 article(s) from Biskupek, Johannes

Orientation of FePt nanoparticles on top of a-SiO₂/Si(001), MgO(001) and sapphire(0001): effect of thermal treatments and influence of substrate and particle size

Martin Schilling,
Paul Ziemann,
Zaoli Zhang,
Johannes Biskupek,
Ute Kaiser and
Ulf Wiedwald

Beilstein J. Nanotechnol. 2016, 7, 591–604, doi:10.3762/bjnano.7.52

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Figure 1: Cross-section HRTEM images of small (2–3 nm) FePt NPs on a MgO(001) substrate after annealing at 65...

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Figure 2: 3 nm thick FePt film on SiO₂/Si(001) substrate after annealing at 650 °C for 30 min: (a) RHEED patt...

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Figure 3: Example of an AFM image (left) and height histogram (right) of micellar FePt NPs on SiO₂/Si(001) af...

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Figure 4: RHEED patterns of 7.6 nm FePt NPs on SiO₂/Si(001) after different annealing steps (a) 570 °C for 60...

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Figure 5: (a–c) RHEED patterns of a FePt film on Al₂O₃(0001), recorded with an electron beam energy of 25 keV...

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Figure 6: RHEED images of FePt NPs on sapphire(0001) single crystals after several annealing steps, recorded ...

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Figure 7: (a–d) RHEED pattern of a FePt film on MgO(100), recorded with an electron beam energy of 25 keV aft...

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Figure 8: (a–c) RHEED patterns of large (5–6 nm) FePt nanoparticles prepared on MgO(001), recorded with an el...

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Figure 9: RHEED pattern of 2–3 nm FePt particles on MgO(001), recorded with an beam energy of 25 keV after an...

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Figure 10: AFM image and height histogram of 2–3 nm FePt nanoparticles on MgO(001) after annealing at 650 °C f...

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Full Research Paper

Published 21 Apr 2016

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Nanostructured, mesoporous Au/TiO₂ model catalysts – structure, stability and catalytic properties

Matthias Roos,
Dominique Böcking,
Kwabena Offeh Gyimah,
Gabriela Kucerova,
Joachim Bansmann,
Johannes Biskupek,
Ute Kaiser,
Nicola Hüsing and
R. Jürgen Behm

Beilstein J. Nanotechnol. 2011, 2, 593–606, doi:10.3762/bjnano.2.63

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Figure 1: Schematic drawing of the end of the SMS capillary and the sample in the scanning mass spectrometer....

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Figure 2: Principle of the SMS measurement on the mesoporous Au/TiO₂ film with CO oxidation as a test reactio...

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Figure 3: X-ray diffraction patterns obtained for TiO₂ coatings treated at different temperatures as indicate...

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Figure 4: Cross-sectional scanning TEM image of a mesoporous Au/TiO₂ film spin-coated onto a Si(100) wafer an...

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Figure 5: Upper part: High-magnification TEM images of the Au/TiO₂ thin-film catalyst after oxidative pretrea...

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Figure 6: Au(4f) signals of the Au nanoparticles in mesoporous Au/TiO₂ catalyst films before (upper panel) an...

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Figure 7: CO conversion during CO oxidation over a mesoporous Au/TiO₂ film as a function of time and sample t...

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Figure 8: CO conversion measured above mesoporous Au/TiO₂ films of different thicknesses.

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Figure 9: Arrhenius plot of the CO conversion, which is proportional to the CO oxidation rate, to determine t...

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Figure 10: a) Determination of the total reaction order n in the CO oxidation reaction at temperatures of 100 ...

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Full Research Paper

Published 15 Sep 2011

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Nanoscaled alloy formation from self-assembled elemental Co nanoparticles on top of Pt films

Luyang Han,
Ulf Wiedwald,
Johannes Biskupek,
Kai Fauth,
Ute Kaiser and
Paul Ziemann

Beilstein J. Nanotechnol. 2011, 2, 473–485, doi:10.3762/bjnano.2.51

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Figure 1: (a) XRD of Pt films on STO(100) and MgO(100) in Bragg–Brentano geometry. The diffractograms clearly...

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Figure 2: SEM images of Co NPs on Pt(111)/MgO(100) and Pt(100)/STO(100) are displayed in panels (a) and (b), ...

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Figure 3: AFM height distributions of Co NPs on Pt(111)/MgO(100) in the as-prepared state and after annealing...

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Figure 4: Panel (a) shows XMCD difference spectra for Co NPs on Pt(111) in the as-prepared state and after an...

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Figure 5: Element specific XMCD hysteresis loops measured at the Co L₃ maximum dichroic signal at T = 12 K an...

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Figure 6: (a) In-plane hysteresis loops measured by SQUID magnetometry at T = 29 K, i.e., close to the compen...

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Figure 7: Bright field TEM images of Co NPs on Pt(100) films after annealing at T_A = 250 °C (as-prepared stat...

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Figure 8: HRTEM image of annealed Co NPs on Pt(100) film after T_A = 500 °C for 30 min. The arrows indicate a ...

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Figure 9: The left image shows the high angle annular dark-field (HAADF) image of the sample shown in Figure 8 using ...

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Figure 10: Proposed model of local alloying and diffusion of Co NPs on Pt films. Details are discussed in the ...

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Full Research Paper

Published 23 Aug 2011

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Platinum nanoparticles from size adjusted functional colloidal particles generated by a seeded emulsion polymerization process

Nicolas Vogel,
Ulrich Ziener,
Achim Manzke,
Alfred Plettl,
Paul Ziemann,
Johannes Biskupek,
Clemens K. Weiss and
Katharina Landfester

Beilstein J. Nanotechnol. 2011, 2, 459–472, doi:10.3762/bjnano.2.50

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Scheme 1: Simplified model of a seeded emulsion polymerization process to clarify the desired reaction pathwa...

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Figure 1: Variation of the amount of monomer added to control the resulting size in the seeded emulsion polym...

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Figure 2: Variation of the amount of initiator relative to the amount of added monomer. The dotted lines are ...

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Figure 3: Effect of different concentrations and types of surfactants applied to stabilize the particles in t...

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Figure 4: Effects of the composition of the continuous phase on the seeded polymerization reactions. The dott...

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Figure 5: A non-conventional lithographic process is used to produce arrays of Pt NPs from platinum-acetylace...

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Figure 6: Pt-precursor loaded PS colloids on a Si₃N₄ membrane in the saturated state after exposure to isotro...

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Figure 7: Diameter of Pt-precursor loaded or unloaded PS particles prepared with the surfactants SDS or Luten...

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Figure 8: HRSEM images of particles in the saturated state after 60 min isotropic oxygen plasma treatment. a)...

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Figure 9: Saturated states after plasma etching: a) Closed surface of a seeded 256 nm particle and b) porous ...

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Full Research Paper

Published 18 Aug 2011

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Preparation and characterization of supported magnetic nanoparticles prepared by reverse micelles

Ulf Wiedwald,
Luyang Han,
Johannes Biskupek,
Ute Kaiser and
Paul Ziemann

Beilstein J. Nanotechnol. 2010, 1, 24–47, doi:10.3762/bjnano.1.5

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Scheme 1: Preparation of NPs by a reverse micelle technique. PS-b-P2VP or PS-b-P4VP is dispersed in anhydrous...

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Figure 1: CoCl₂ loaded PS(1779)-b-P2VP(857) reverse micelles deposited at different dip-coating velocities; (...

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Figure 2: Co NPs prepared from CoCl₂-loaded PS(1779)-b-P2VP(857) reverse micelles deposited on a Si AFM-tip b...

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Figure 3: Fe (left column) and Co (right column) NPs prepared from PS(312)-P2VP(71) (upper panels) and PS(177...

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Figure 4: SEM micrographs of FePt NPs with 2.6 nm, 4.5 nm, and 9.4 nm diameter (top panels) and their AFM hei...

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Figure 5: Photoelectron spectroscopy of Co-precursor loaded PS(1779)-P2VP(857) reverse micelles after differe...

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Figure 6: Pt-4f and Fe-2p XPS spectra of 9.8 nm FePt particles before and after exposure to ambient air for 2...

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Figure 7: TEM images of 3 nm FePt NPs on Si/SiO₂ after annealing at 650 °C for 90 min. (a) Bright-field TEM i...

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Figure 8: Aberration corrected HRTEM images of FePt particles seen along [100] direction. The L1₀ ordering al...

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Figure 9: Aberration corrected HR-TEM images of about 8 nm FePt NPs in [101] orientation. Crystal defects such as ...

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Figure 10: (a) Schematics of the compensation approach: Temperature dependence of the magnetic susceptibility ...

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Figure 11: (a) DC-demagnetization and isothermal remanent magnetization of 8 nm Co particles measured by SQUID...

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Figure 12: Element-specific magnetic hysteresis loops of 5.8 nm FePt NPs taken at the Fe-L₃ edge at T = 11 K a...

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Figure 13: Coercive field at T = 300 K as function of the diameter of FePt NPs after annealing for 30 min at T...

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Figure 14: Experimental hysteresis loops of 5.8 nm FePt NPs at 11 K and simulations using a bimodal Gaussian K...

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Figure 15: Distributions of the effective anisotropy K_eff for arrays of differently sized NPs used for simulat...

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Figure 16: (a) Coercive fields at T = 11 K and T = 300 K as function of 30 min annealing time at temperature T_A...

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Figure 17: Co-L_3,2 XA and XMCD spectra of 5.6 nm Co₅₆Pt₄₄ NPs after annealing at 700 °C taken at external fiel...

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Figure 18: Element-specific magnetic hysteresis loops of 5.8 nm Co₅₆Pt₄₄ NPs taken at the Co-L₃ edge maximum d...

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Figure 19: SEM images of 8 nm Co-based NP after oxygen plasma (a) and after Au photoseeding of reduced particl...

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Full Research Paper

Published 22 Nov 2010

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Orientation of FePt nanoparticles on top of a-SiO2/Si(001), MgO(001) and sapphire(0001): effect of thermal treatments and influence of substrate and particle size

Nanostructured, mesoporous Au/TiO2 model catalysts – structure, stability and catalytic properties

Nanoscaled alloy formation from self-assembled elemental Co nanoparticles on top of Pt films

Platinum nanoparticles from size adjusted functional colloidal particles generated by a seeded emulsion polymerization process

Preparation and characterization of supported magnetic nanoparticles prepared by reverse micelles

Orientation of FePt nanoparticles on top of a-SiO₂/Si(001), MgO(001) and sapphire(0001): effect of thermal treatments and influence of substrate and particle size

Nanostructured, mesoporous Au/TiO₂ model catalysts – structure, stability and catalytic properties