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Fingerprinting the Properties of WS₂ Nanostructures using Advanced Transmission Electron Microscopy Techniques: From Growth to Characterization

van Heijst, S.E. (author)

Two-dimensional (2D) layered materials have attracted the interest of the scientific community following the discovery of graphene and its extraordinary properties. Of particular interest is a class of materials called transition metal dichalcogenides (TMDs). The materials within this class were discovered to show similarly...

doctoral thesis 2024

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Effect of stacking fault energy on the thickness and density of annealing twins in recrystallized FCC medium and high-entropy alloys

Schneider, Mike (author), Couzinié, Jean Philippe (author), Shalabi, Amin (author), Ibrahimkhel, Farhad (author), Ferrari, A. (author), Körmann, F.H.W. (author), Laplanche, Guillaume (author)

This work aims to predict the microstructure of recrystallized medium and high-entropy alloys (MEAs and HEAs) with a face-centered cubic structure, in particular the density of annealing twins and their thickness. Eight MEAs and five HEAs from the Cr-Mn-Fe-Co-Ni system are considered, which have been cast, homogenized, cold-worked and...

journal article 2024

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4D-STEM Nanoscale Strain Analysis in van der Waals Materials: Advancing beyond Planar Configurations

Bolhuis, M. (author), van Heijst, S.E. (author), Sangers, J.J.M. (author), Conesa Boj, S. (author)

Achieving nanoscale strain fields mapping in intricate van der Waals (vdW) nanostructures, like twisted flakes and nanorods, presents several challenges due to their complex geometry, small size, and sensitivity limitations. Understanding these strain fields is pivotal as they significantly influence the optoelectronic properties of vdW...

journal article 2024

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Optical STEM detection for scanning electron microscopy

Kievits, A.J. (author), Duinkerken, B. H.Peter (author), Fermie, Job (author), Lane, R. (author), Giepmans, Ben N.G. (author), Hoogenboom, J.P. (author)

Recent advances in electron microscopy techniques have led to a significant scale up in volumetric imaging of biological tissue. The throughput of electron microscopes, however, remains a limiting factor for the volume that can be imaged in high resolution within reasonable time. Faster detection methods will improve throughput. Here, we have...

journal article 2024

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In situ TEM observations of the growth of bainitic ferrite in an Fe-0.3C-3Mn-1.5Si-0.15Mo steel

Nutter, John (author), Qi, Jiahui (author), Farahani, H. (author), Rainforth, W. Mark (author), van der Zwaag, S. (author)

The current study reports in situ TEM observations of the growth of bainitic ferrite in an Fe-0.3C-3Mn-1.5Si-0.15Mo steel held isothermally at 300 °C with a higher spatio-temporal resolution than in previous studies. Significant variations were found in the lengthening rate, with the highest being in excess of 30,000 nm.s⁻¹ while...

journal article 2023

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Investigation of coarsening of oxide nanoparticles at 1400 K and its effect on the microstructure formation of an ODS Eurofer steel

Marques Pereira, V. (author), Davis, T. P. (author), Mayoral, M. H. (author), Kumar, A. (author), Schut, H. (author), Sietsma, J. (author)

Oxide Dispersion Strengthened (ODS) steels are potential candidate materials for application as structural components of fission and fusion reactors, known for their high thermal stability, high resistance to creep and to radiation-induced damage. These attractive properties result from the presence of the fine and highly thermally stable...

journal article 2022

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An Edgy Journey with Transition Metal Dichalcogenides: From Flakes to Nanopillars

Maduro, L.A. (author)

The family of transitionmetal dichalcogenides offer a unique platformfor electronic and optical tunability due to the sensitivity to their dimensional configuration, edge terminations, and varying crystal phases. In this thesis we focus on structures based on the transition metal dichalcogenides MoS2 and WS2. We study how different crystal...

doctoral thesis 2021

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Position-Controlled Fabrication of Vertically Aligned Mo/MoS₂ Core–Shell Nanopillar Arrays

Maduro, L.A. (author), Noordam, M.L. (author), Bolhuis, M. (author), Kuipers, L. (author), Conesa Boj, S. (author)

The fabrication of 2D materials, such as transition metal dichalcogenides (TMDs), in geometries beyond the standard platelet-like configuration exhibits significant challenges which severely limit the range of available morphologies. These challenges arise due to the anisotropic character of their bonding van der Waals out-of-plane while...

journal article 2021

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Charting the low-loss region in electron energy loss spectroscopy with machine learning

Roest, Laurien I. (author), van Heijst, S.E. (author), Maduro, L.A. (author), Rojo, Juan (author), Conesa Boj, S. (author)

Exploiting the information provided by electron energy-loss spectroscopy (EELS) requires reliable access to the low-loss region where the zero-loss peak (ZLP) often overwhelms the contributions associated to inelastic scatterings off the specimen. Here we deploy machine learning techniques developed in particle physics to realise a model...

journal article 2021

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Microstructure, precipitate and property evolution in cold-rolled Ti-V high strength low alloy steel

Zhang, Xukai (author), Ioannidou, C. (author), ten Brink, Gert H. (author), Navarro Lopez, A. (author), Wormann, Jan (author), Campaniello, Jean (author), Dalgliesh, Robert M. (author), van Well, A.A. (author), Offerman, S.E. (author), Kranendonk, Winfried (author), Kooi, Bart J. (author)

A cold-rolled Ti-V high strength low alloy (HSLA) steel was isothermally annealed at 650 °C and 700 °C for different times. A unique combination of techniques including visible light microscopy (VLM), transmission electron microscopy (TEM), matrix dissolution, small angle neutron scattering (SANS) and hardness measurement has been employed to...

journal article 2020

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Robust Sample Preparation of Large-Area In- and Out-of-Plane Cross Sections of Layered Materials with Ultramicrotomy

Cichocka, M.O. (author), Bolhuis, M. (author), van Heijst, S.E. (author), Conesa Boj, S. (author)

Layered materials (LMs) such as graphene or MoS2 have attracted a great deal of interest recently. These materials offer unique functionalities due to their structural anisotropy characterized by weak van der Waals bonds along the out-of-plane axis and covalent bonds in the in-plane direction. A central requirement to access the structural...

journal article 2020

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Imaging DNA nanostructures with advanced TEM techniques

Kabiri, Y. (author)

The low contrast of biomolecules in TEM has been a great obstacle for their structure determination and hence to the understanding of their structure-function relation. Historically, single DNA strands remained one the most difficult classes of biomolecular specimens to image, due to low electron scattering strength of its constituent elements....

doctoral thesis 2019

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Fading into the background: the dark space surrounding Vermeer’s Girl with a Pearl Earring

Vandivere, Abbie (author), van Loon, A. (author), Dore-Callewaert, T.W.J. (author), Haswell, Ralph (author), Proaño Gaibor, Art Ness (author), van Keulen, Henk (author), Leonhardt, Emilien (author), Dik, J. (author)

The background of Vermeer’s Girl with a Pearl Earring (c. 1665, Mauritshuis) has, until recently, been interpreted as a flat dark space. The painting was examined in 2018 as part of the research project The Girl in the Spotlight using a combination of micro- and macro-scale analytical techniques. The stratigraphy of the background was...

journal article 2019

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Intercalating Electron Dyes for TEM Visualization of DNA at the Single-Molecule Level

Kabiri, Y. (author), Angelin, Alessandro (author), Ahmed, Ishtiaq (author), Mutlu, Hatice (author), Bauer, Jens (author), Niemeyer, Christof M. (author), Zandbergen, H.W. (author), Dekker, C. (author)

Staining compounds containing heavy elements (electron dyes) can facilitate the visualization of DNA and related biomolecules by using TEM. However, research into the synthesis and utilization of alternative electron dyes has been limited. Here, we report the synthesis of a novel DNA intercalator molecule, bis-acridine uranyl (BAU). NMR...

journal article 2019

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Atomic-scale investigations of isothermally formed bainite microstructures in 51CrV4 spring steel

Goulas, C. (author), Kumar, A. (author), Mecozzi, M.G. (author), Castro-Cerda, Felipe Manuel (author), Herbig, Michael (author), Petrov, R.H. (author), Sietsma, J. (author)

Atomic-scale investigation was performed on 51CrV4 steel, isothermally held at different temperatures within the bainitic temperature range. Transmission electron microscopy (TEM) analysis revealed three different morphologies: lower, upper, and inverse bainite. Atom Probe Tomography (APT) analysis of lower bainite revealed cementite...

journal article 2019

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In situ study on fracture behaviour of white etching layers formed on rails

Kumar, A. (author), Saxena, A. K. (author), Kirchlechner, C. (author), Herbig, M. (author), Brinkmann, S. (author), Petrov, R.H. (author), Sietsma, J. (author)

Failure in engineering materials like steels is strongly affected by in-service deleterious alterations in their microstructure. White Etching Layers (WELs) are an example of such in-service alterations in the pearlitic microstructure at the rail surface. Cracks initiate in the rails due to delamination and fracture of these layers and...

journal article 2019

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Direct TEM observation of α/γ interface migration during cyclic partial phase transformations at intercritical temperatures in an Fe-0.1C −0.5Mn alloy

Nutter, J. (author), Farahani, H. (author), Rainforth, W. M. (author), van der Zwaag, S. (author)

The kinetic behaviour of austenite/ferrite interfaces in a low carbon – 0.5 mass% Mn containing steel during Cyclic Partial Phase Transformation (CPPT) experiments has been investigated using hot stage Transmission Electron Microscopy (TEM). Individual interfaces were observed to display behaviour typical of CPPT experiments as recorded in...

journal article 2019

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VC-precipitation kinetics studied by Small-Angle Neutron Scattering in nano-steels

Ioannidou, C. (author), Arechabaleta Guenechea, Z. (author), Rijkenberg, Arjan (author), Dalgliesh, Robert M. (author), van Well, A.A. (author), Offerman, S.E. (author)

Nanosteels are used in automotive applications to accomplish resource-efficiency while providing high-tech properties. Quantitative data and further understanding on the precipitation kinetics in Nanosteels can contribute to fulfil this goal. Small-Angle Neutron Scattering measurements are performed on a Fe-C-Mn-V steel, previously heat-treated...

journal article 2018

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Concept and design of a beam blanker with integrated photoconductive switch for ultrafast electron microscopy

Weppelman, I.G.C. (author), Moerland, R.J. (author), Hoogenboom, J.P. (author), Kruit, P. (author)

We present a new method to create ultrashort electron pulses by integrating a photoconductive switch with an electrostatic deflector. This paper discusses the feasibility of such a system by analytical and numerical calculations. We argue that ultrafast electron pulses can be achieved for micrometer scale dimensions of the blanker, which are...

journal article 2018

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High-resolution characterization of the martensite-austenite constituent in a carbide-free bainitic steel

Hofer, Christina (author), Bliznuk, Vitaliy (author), Verdiere, An (author), Petrov, R.H. (author), Winkelhofer, Florian (author), Clemens, Helmut (author), Primig, Sophie (author)

The multiphase microstructure of carbide-free bainitic steels comprises bainitic ferrite laths, retained austenite with different morphologies, a minor fraction of carbides and so-called martensite-austenite areas, which partially transform during the last cooling step. While the other constituent received much attention, little is known...

journal article 2018