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5 article(s) from Wolff, Annalena

A low-kiloelectronvolt focused ion beam strategy for processing low-thermal-conductance materials with nanoampere currents

Annalena Wolff,
Nico Klingner,
William Thompson,
Yinghong Zhou,
Jinying Lin and
Yin Xiao

Beilstein J. Nanotechnol. 2024, 15, 1197–1207, doi:10.3762/bjnano.15.97

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Figure 1: (A) Ion trajectories for 5 keV gallium ions (Ga⁺) in human skin. SRIM/TRIM assumes a beam with a si...

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Figure 2: COMSOL simulations of 5 keV gallium ions (Ga⁺) interacting with collagen. Top row: Single ion impac...

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Figure 3: Illustration of the numerically solved three-dimensional heat equation for 5 keV Ga⁺ ions in collag...

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Figure 4: SEM micrographs showing cross sections that were cut into collagen using (A) 30 keV gallium ions wi...

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Figure 5: SEM micrographs showing cross sections that were cut into collagen using 5 keV and different ion be...

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Figure 6: TEM micrographs showing cross sections of collagen prepared with 5 keV gallium ions. The collagen f...

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Full Research Paper

Published 27 Sep 2024

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Is the Ne operation of the helium ion microscope suitable for electron backscatter diffraction sample preparation?

Annalena Wolff

Beilstein J. Nanotechnol. 2021, 12, 965–983, doi:10.3762/bjnano.12.73

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Figure 1: Illustration of the underlying ion–solid interactions that occur when irradiating a sample with dif...

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Figure 2: Illustration of the experimental polishing setup for the different ion species, ion energies, and i...

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Figure 3: STEM, TEM, and EBSD measurements of an unpolished Cu control sample. (a) 30 kV STEM image showing a...

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Figure 4: EBSD measurements of unpolished, electropolished, and low-energy Ar ion-polished Cu sample. Top row...

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Figure 5: Ion channeling images showing the changes in ion channel contrast upon Ga irradiation. 30 keV Ga 0°...

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Figure 6: STEM, TEM, SAED, and simulated SAED patterns for the different ion irradiation approaches. (a–d) 30...

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Figure 7: EBSD measurements and evaluation for different ion irradiation approaches. (a–c) 30 keV Ga, 0° inci...

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Figure 8: TEM measurements of a 25 keV Ne 0° incidence (top row) as well as 2 keV Ga 88.5° incidence (bottom ...

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Figure 9: Illustration showing the enlarged irradiation area resulting from polishing at glancing angles. The...

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Full Research Paper

Published 31 Aug 2021

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Scanning transmission helium ion microscopy on carbon nanomembranes

Daniel Emmrich,
Annalena Wolff,
Nikolaus Meyerbröker,
Jörg K. N. Lindner,
André Beyer and
Armin Gölzhäuser

Beilstein J. Nanotechnol. 2021, 12, 222–231, doi:10.3762/bjnano.12.18

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Figure 1: (a) Operating principle of the STIM dark-field detector. Thin foils or membranes are placed in the ...

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Figure 2: Comparison of HIM detection schemes. (a) SE and (b) dark-field STIM signal at an acceptance angle o...

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Figure 3: (a) SRIM scattering distribution of 30 keV He ions for single- and double-layer membranes, assuming...

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Figure 4: Dark-field STIM images of (a) a thin and (b) a thick membrane. The membrane in (a) shows a rupture ...

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Figure 5: Acceptance angle at which the maximum signal difference between a double layer and a single layer i...

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Figure 6: Thickness determination by dark-field STIM and Monte Carlo simulations. (a) The measured image grey...

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Figure 7: Alteration of a CNM by EFTEM at 60 keV beam energy. (a) The thickness decreases during EFTEM imagin...

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Full Research Paper

Published 26 Feb 2021

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Oriented attachment explains cobalt ferrite nanoparticle growth in bioinspired syntheses

Annalena Wolff,
Walid Hetaba,
Marco Wißbrock,
Stefan Löffler,
Nadine Mill,
Katrin Eckstädt,
Axel Dreyer,
Inga Ennen,
Norbert Sewald,
Peter Schattschneider and
Andreas Hütten

Beilstein J. Nanotechnol. 2014, 5, 210–218, doi:10.3762/bjnano.5.23

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Figure 1: Schematic of the oriented attachment process that occurs in the presence of organic additives. (a) ...

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Figure 2: (a)–(c) Change in the electron diffraction pattern (shown with inverted intensity for better visibi...

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Figure 3: Top: Change in the electron diffraction pattern of diamond shaped particles with time. The inverted...

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Figure 4: Change in the average disc diameter with time. The data is fitted with the kinetic model for an ori...

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Figure 5: Schematic of nanoparticle formation during the biomimetic growth process. (a) Crystallites are form...

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Figure 6: Geometry used for the calculation of the inner surface reduction, with z as the particle thickness ...

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Full Research Paper

Published 28 Feb 2014

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Review and outlook: from single nanoparticles to self-assembled monolayers and granular GMR sensors

Alexander Weddemann,
Inga Ennen,
Anna Regtmeier,
Camelia Albon,
Annalena Wolff,
Katrin Eckstädt,
Nadine Mill,
Michael K.-H. Peter,
Jochen Mattay,
Carolin Plattner,
Norbert Sewald and
Andreas Hütten

Beilstein J. Nanotechnol. 2010, 1, 75–93, doi:10.3762/bjnano.1.10

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Figure 1: Schematic representation of the precursor concentration according to the LaMer model. The blue line...

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Figure 2: Interaction of different ligands with the surface of a metallic nanoparticle. There is only a singl...

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Figure 3: Transmission electron microscopy (TEM) images of Co particles of various sizes and morphologies syn...

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Figure 4: (a) Nanoparticles synthesized by micro emulsion approach and (b) by employment of the synthetic pro...

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Figure 5: Hypothesized particle formation during the biomineralization process in magnetotactic bacteria (in ...

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Figure 6: Dynamic evolution of different concentrations for the decay rates k₁ = 0.00753 s⁻¹ and k₂ = 0.0136 s...

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Figure 7: Co particles with a diameter of 4.9 and 10 nm measured at room temperature shortly after the prepar...

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Figure 8: Self-assembled FeCo nanoparticles with different dimensions: (a) The 2D-monolayer of 4.6 nm sized s...

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Figure 9: (a) Scheme of two particles with a metallic core of radius R surrounded by a ligand shell of the th...

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Figure 10: Images of self-assembled spherical Co nanoparticles: (a) TEM image of a bimodal distribution; large...

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Figure 11: TEM images of self-assembled Co particles with different morphologies. Nanodisks exhibit a typical ...

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Figure 12: Schematic representation of the tunnel magnetoresistance (TMR) sensor setup for the detection of mu...

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Figure 13: Properties of the magnetoresistive sensors. (a) Comparison between experimental and numerical data....

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Figure 14: GMR response of a monolayer consisting of 8 nm Co particles covered by a thin Cu film. Measurements...

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Figure 15: Magnetoresistance measurements at room temperature on a granular system consisting of Co nanopartic...

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Figure 16: Magnetization evolution of four interacting magnetic dipoles arranged in the corners of a square wi...

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Figure 17: Equilibrium states of 10 × 10-particle arrays with cubic and hexagonal symmetry. Magnetic moments i...

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Figure 18: Direction dependent responses of different small particle assemblies to an external magnetic field....

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Figure 19: Response maps of a 10 × 10-hexagonal gGMR sensor for a probe particle with R_p = 50 nm and M_p = 500 ...

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Figure 20: Comparison between free (dotted) and hysteretic (line) sensor behavior for cubic and hexagonal symm...

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Review

Published 22 Nov 2010

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