5 article(s) from Biskupek, Johannes
- Full Research Paper
- Published 21 Apr 2016
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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 15 Sep 2011
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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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Supp. Info
- Full Research Paper
- Published 23 Aug 2011
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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 TA = 250 °C (as-prepared stat...
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Figure 8: HRTEM image of annealed Co NPs on Pt(100) film after TA = 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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Video
- Full Research Paper
- Published 18 Aug 2011
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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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Video
- Full Research Paper
- Published 22 Nov 2010
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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 Keff 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 TA...
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Figure 17: Co-L3,2 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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