@article{58493, author = {{Zietlow, Christian and Lindner, Jörg K. N.}}, issn = {{2045-2322}}, journal = {{Scientific Reports}}, number = {{1}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{An applied noise model for scintillation-based CCD detectors in transmission electron microscopy}}}, doi = {{10.1038/s41598-025-85982-4}}, volume = {{15}}, year = {{2025}}, } @article{58178, author = {{Lindner, Jörg K. N. and Zietlow, Christian}}, issn = {{0304-3991}}, journal = {{Ultramicroscopy}}, publisher = {{Elsevier BV}}, title = {{{An applied noise model for low-loss EELS maps}}}, doi = {{10.1016/j.ultramic.2024.114101}}, year = {{2025}}, } @article{60001, author = {{Zietlow, Christian and Lindner, Jörg}}, journal = {{Ultramicroscopy}}, number = {{275}}, publisher = {{Elsevier}}, title = {{{An unbiased ADMM-TGV algorithm for the deconvolution of STEM-EELS maps}}}, doi = {{10.1016/j.ultramic.2025.114159}}, year = {{2025}}, } @article{54147, abstract = {{AbstractMost properties of solid materials are defined by their internal electric field and charge density distributions which so far are difficult to measure with high spatial resolution. Especially for 2D materials, the atomic electric fields influence the optoelectronic properties. In this study, the atomic‐scale electric field and charge density distribution of WSe2 bi‐ and trilayers are revealed using an emerging microscopy technique, differential phase contrast (DPC) imaging in scanning transmission electron microscopy (STEM). For pristine material, a higher positive charge density located at the selenium atomic columns compared to the tungsten atomic columns is obtained and tentatively explained by a coherent scattering effect. Furthermore, the change in the electric field distribution induced by a missing selenium atomic column is investigated. A characteristic electric field distribution in the vicinity of the defect with locally reduced magnitudes compared to the pristine lattice is observed. This effect is accompanied by a considerable inward relaxation of the surrounding lattice, which according to first principles DFT calculation is fully compatible with a missing column of Se atoms. This shows that DPC imaging, as an electric field sensitive technique, provides additional and remarkable information to the otherwise only structural analysis obtained with conventional STEM imaging.}}, author = {{Groll, Maja and Bürger, Julius and Caltzidis, Ioannis and Jöns, Klaus D. and Schmidt, Wolf Gero and Gerstmann, Uwe and Lindner, Jörg K. N.}}, issn = {{1613-6810}}, journal = {{Small}}, publisher = {{Wiley}}, title = {{{DFT‐Assisted Investigation of the Electric Field and Charge Density Distribution of Pristine and Defective 2D WSe2 by Differential Phase Contrast Imaging}}}, doi = {{10.1002/smll.202311635}}, year = {{2024}}, } @article{57954, author = {{Hengsbach, Florian and Bürger, Julius and Andreiev, Anatolii and Biggs, Krista and Fischer-Bühner, Jörg and Lindner, Jörg K.N and Hoyer, Kay-Peter and Olson, Gregory B. and Schaper, Mirko}}, issn = {{1359-6454}}, journal = {{Acta Materialia}}, publisher = {{Elsevier BV}}, title = {{{Die steel design for additive manufacturing}}}, doi = {{10.1016/j.actamat.2024.120326}}, volume = {{284}}, year = {{2024}}, } @article{52089, abstract = {{AbstractImage restoration via alternating direction method of multipliers (ADMM) has gained large interest within the last decade. Solving standard problems of Gaussian and Poisson noise, the set of “Total Variation” (TV)-based regularizers proved to be efficient and versatile. In the last few years, the “Total Generalized Variation” (TGV) approach combined TV regularizers of different orders adaptively to better suit local regions in the image. This improved the technique significantly. The approach solved the staircase problem inherent of the first-order TV while keeping the beneficial edge preservation. The iterative minimization for the augmented Lagrangian of TGV problems requires four important parameters: two penalty parameters $${\rho }$$ ρ and $${\eta }$$ η and two regularization parameters $${\lambda _{0}}$$ λ 0 and $${\lambda _{1}}$$ λ 1 . The choice of penalty parameters decides on the convergence speed, and the regularization parameters decide on the impact of the respective regularizer and are determined by the noise level in the image. For scientific applications of such algorithms, an automated and thus objective method to determine these parameters is essential to receive unbiased results independent of the user. Obviously, both sets of parameters are to be well chosen to achieve optimal results, too. In this paper, a method is proposed to adaptively choose optimal $${\rho }$$ ρ and $${\eta }$$ η values for the iteration to converge faster, based on the primal and dual residuals arising from the optimality conditions of the augmented Lagrangian. Further, we show how to choose $${\lambda _{0}}$$ λ 0 and $${\lambda _{1}}$$ λ 1 based on the inherent noise in the image.}}, author = {{Zietlow, Christian and Lindner, Jörg K. N.}}, issn = {{1017-1398}}, journal = {{Numerical Algorithms}}, keywords = {{Applied Mathematics}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{ADMM-TGV image restoration for scientific applications with unbiased parameter choice}}}, doi = {{10.1007/s11075-024-01759-2}}, year = {{2024}}, } @article{54868, abstract = {{AbstractMost properties of solid materials are defined by their internal electric field and charge density distributions which so far are difficult to measure with high spatial resolution. Especially for 2D materials, the atomic electric fields influence the optoelectronic properties. In this study, the atomic‐scale electric field and charge density distribution of WSe2 bi‐ and trilayers are revealed using an emerging microscopy technique, differential phase contrast (DPC) imaging in scanning transmission electron microscopy (STEM). For pristine material, a higher positive charge density located at the selenium atomic columns compared to the tungsten atomic columns is obtained and tentatively explained by a coherent scattering effect. Furthermore, the change in the electric field distribution induced by a missing selenium atomic column is investigated. A characteristic electric field distribution in the vicinity of the defect with locally reduced magnitudes compared to the pristine lattice is observed. This effect is accompanied by a considerable inward relaxation of the surrounding lattice, which according to first principles DFT calculation is fully compatible with a missing column of Se atoms. This shows that DPC imaging, as an electric field sensitive technique, provides additional and remarkable information to the otherwise only structural analysis obtained with conventional STEM imaging.}}, author = {{Groll, Maja and Bürger, Julius and Caltzidis, Ioannis and Jöns, Klaus D. and Schmidt, Wolf Gero and Gerstmann, Uwe and Lindner, Jörg K. N.}}, issn = {{1613-6810}}, journal = {{Small}}, publisher = {{Wiley}}, title = {{{DFT‐Assisted Investigation of the Electric Field and Charge Density Distribution of Pristine and Defective 2D WSe2 by Differential Phase Contrast Imaging}}}, doi = {{10.1002/smll.202311635}}, year = {{2024}}, } @inbook{47133, author = {{Bürger, Julius and Lindner, Jörg K. N.}}, booktitle = {{Climate Protection, Resource Efficiency, and Sustainable Mobility - Transdisciplinary Approaches to Design and Manufacturing Technology}}, isbn = {{978-3-8376-6377-8}}, pages = {{61--86}}, title = {{{Transmission electron microscopy and transdisciplinary research}}}, year = {{2023}}, } @article{21125, author = {{Kismann, Michael and Riedl, Dr. Thomas and Lindner, Prof. Dr. Jörg KN}}, journal = {{Materials Science in Semiconductor Processing}}, title = {{{Ordered arrays of Si nanopillars with alternating diameters fabricated by nanosphere lithography and metal-assisted chemical etching}}}, year = {{2021}}, } @article{21374, abstract = {{A dark-field scanning transmission ion microscopy detector was designed for the helium ion microscope. The detection principle is based on a secondary electron conversion holder with an exchangeable aperture strip allowing its acceptance angle to be tuned from 3 to 98 mrad. The contrast mechanism and performance were investigated using freestanding nanometer-thin carbon membranes. The results demonstrate that the detector can be optimized either for most efficient signal collection or for maximum image contrast. The designed setup allows for the imaging of thin low-density materials that otherwise provide little signal or contrast and for a clear end-point detection in the fabrication of nanopores. In addition, the detector is able to determine the thickness of membranes with sub-nanometer precision by quantitatively evaluating the image signal and comparing the results with Monte Carlo simulations. The thickness determined by the dark-field transmission detector is compared to X-ray photoelectron spectroscopy and energy-filtered transmission electron microscopy measurements.}}, author = {{Emmrich, Daniel and Wolff, Annalena and Meyerbröker, Nikolaus and Lindner, Jörg and Beyer, André and Gölzhäuser, Armin}}, issn = {{2190-4286}}, journal = {{Beilstein Journal of Nanotechnology}}, pages = {{222--231}}, title = {{{Scanning transmission helium ion microscopy on carbon nanomembranes}}}, doi = {{10.3762/bjnano.12.18}}, year = {{2021}}, } @article{20501, author = {{Rosenthal, Marta and Lindner, Jörg K N and Gerstmann, Uwe and Meier, Armin and Schmidt, W Gero and Wilhelm, René}}, journal = {{Royal Society of Chemistry }}, number = {{42930-42937}}, title = {{{A photoredox catalysed Heck reaction via hole transfer from a Ru(II)-bis(terpyridine) complex to graphene oxide }}}, doi = {{10.1039/d0ra08749a}}, volume = {{10}}, year = {{2020}}, } @article{20848, author = {{Tischendorf, R. and Simmler, M. and Weinberger, C. and Bieber, M. and Reddemann, M. and Fröde, F. and Lindner, J. and Pitsch, H. and Kneer, R. and Tiemann, M. and Nirschl, H. and Schmid, H.-J.}}, issn = {{0021-8502}}, journal = {{Journal of Aerosol Science}}, title = {{{Examination of the evolution of iron oxide nanoparticles in flame spray pyrolysis by tailored in situ particle sampling techniques}}}, doi = {{10.1016/j.jaerosci.2020.105722}}, year = {{2020}}, } @article{20892, author = {{Bürger, Julius and Riedl, Thomas and Lindner, Jörg K.N.}}, issn = {{0304-3991}}, journal = {{Ultramicroscopy}}, title = {{{Influence of lens aberrations, specimen thickness and tilt on differential phase contrast STEM images}}}, doi = {{10.1016/j.ultramic.2020.113118}}, year = {{2020}}, } @article{24100, abstract = {{Zinc oxide (ZnO) hollow spheres with defined morphology and micro-/nanostructure are prepared by a hydrothermal synthesis approach. The materials possess fine-leaved structures at their particle surface (nanowall hollow micro spheres). Morphology control is achieved by citric acid used as an additive in variable relative quantities during the synthesis. The structure formation is studied by various time-dependent ex situ methods, such as scanning electron microscopy, x-ray diffraction, and Raman spectroscopy. The fine-leaved surface structure is characterized by high-resolution transmission electron microscopy techniques (HRTEM, STEM), using a high-angle annular dark field detector, as well as by differential phase contrast analysis. In-depth structural characterization of the nanowalls by drop-by-drop ex situ FE-SEM analysis provides insight into possible structure formation mechanisms. Further investigation addresses the thermal stability of the particle morphology and the enhancement of the surface-to-volume ratio by heat treatment (examined by N2 physisorption).}}, author = {{Engelkemeier, Katja and Lindner, Jörg and Bürger, Julius and Vaupel, Kathrin and Hartmann, Marc and Tiemann, Michael and Hoyer, Kay-Peter and Schaper, Mirko}}, issn = {{0957-4484}}, journal = {{Nanotechnology}}, pages = {{095701}}, title = {{{Nano-architectural complexity of zinc oxide nanowall hollow microspheres and their structural properties}}}, doi = {{10.1088/1361-6528/ab55bc}}, volume = {{31}}, year = {{2020}}, } @article{29744, abstract = {{

A hole transfer from an excited Ru unit towards graphene oxide significantly improved the photocatalytic activity of the complexes.

}}, author = {{Rosenthal, Marta and Lindner, Jörg and Gerstmann, Uwe and Meier, Armin and Schmidt, Wolf Gero and Wilhelm, René}}, issn = {{2046-2069}}, journal = {{RSC Advances}}, keywords = {{General Chemical Engineering, General Chemistry}}, number = {{70}}, pages = {{42930--42937}}, publisher = {{Royal Society of Chemistry (RSC)}}, title = {{{A photoredox catalysed Heck reaction via hole transfer from a Ru(ii)-bis(terpyridine) complex to graphene oxide}}}, doi = {{10.1039/d0ra08749a}}, volume = {{10}}, year = {{2020}}, } @article{20890, author = {{Engelkemeier, Katja and Lindner, Jörg K N and Bürger, Julius and Vaupel, Kathrin and Hartmann, Marc and Tiemann, Michael and Hoyer, Kay-Peter and Schaper, Mirko}}, issn = {{0957-4484}}, journal = {{Nanotechnology}}, title = {{{Nano-architectural complexity of zinc oxide nanowall hollow microspheres and their structural properties}}}, doi = {{10.1088/1361-6528/ab55bc}}, year = {{2019}}, } @article{3912, abstract = {{DNA origami nanostructures are versatile substrates for the controlled arrangement of molecular capture sites with nanometer precision and thus have many promising applications in singlemolecule bioanalysis. Here, we investigate the adsorption of DNA origami nanostructures in nanohole arrays which represent an important class of biosensors and may benefit from the incorporation of DNA origami-based molecular probes. Nanoholes with well-defined diameter that enable the adsorption of single DNA origami triangles are fabricated in Au films on Siwafers by nanosphere lithography. The efficiency of directed DNA origami adsorption on the exposed SiO2 areas at the bottoms of the nanoholes is evaluated in dependence of various parameters, i.e., Mg2+ and DNA origami concentrations, buffer strength, adsorption time, and nanohole diameter. We observe that the buffer strength has a surprisingly strong effect on DNA origami adsorption in the nanoholes and that multiple DNA origami triangles with 120 nm edge length can adsorb in nanoholes as small as 120 nm in diameter. We attribute the latter observation to the low lateral mobility of once adsorbed DNA origami on the SiO2 surface, in combination with parasitic adsorption to the Au film. While parasitic adsorption can be suppressed by modifying the Au film with a hydrophobic self-assembled monolayer, the limited surface mobility of the adsorbed DNA origami still leads to poor localization accuracy in the nanoholes and results in many DNA origami crossing the boundary to the Au film even under optimized conditions. We discuss possible ways to minimize this effect by varying the composition of the adsorption buffer, employing different fabrication conditions, or using other substrate materials for nanohole array fabrication.}}, author = {{Brassat, Katharina and Ramakrishnan, Saminathan and Bürger, Julius and Hanke, Marcel and Doostdar, Mahnaz and Lindner, Jörg and Grundmeier, Guido and Keller, Adrian}}, issn = {{0743-7463}}, journal = {{Langmuir}}, publisher = {{American Chemical Society (ACS)}}, title = {{{On the Adsorption of DNA Origami Nanostructures in Nanohole Arrays}}}, doi = {{10.1021/acs.langmuir.8b00793}}, year = {{2018}}, } @article{22664, author = {{Brassat, Katharina and Ramakrishnan, Saminathan and Bürger, Julius and Hanke, Marcel and Doostdar, Mahnaz and Lindner, Jörg and Grundmeier, Guido and Keller, Adrian}}, issn = {{0743-7463}}, journal = {{Langmuir}}, pages = {{14757--14765}}, title = {{{On the Adsorption of DNA Origami Nanostructures in Nanohole Arrays}}}, doi = {{10.1021/acs.langmuir.8b00793}}, volume = {{34}}, year = {{2018}}, } @inproceedings{4412, author = {{Kismann, Michael and Riedl, Thomas and Wu, Xia and Wagner, Thorsten and Lindner, Jörg}}, location = {{Warsaw (Poland)}}, title = {{{Photonic crystal properties of Si and SiO2 nanopillar arrays fabricated by nanosphere lithography and metal-assisted wet-chemical etching}}}, year = {{2018}}, } @inproceedings{4413, author = {{Riedl, Thomas and Kunnathully, Vinay and Trapp, Alexander and Reuter, Dirk and Lindner, Jörg}}, location = {{Sendai (Japan)}}, title = {{{Strain Relaxation in InAs Nanoislands on top of GaAs (111) A Nanopillars}}}, year = {{2018}}, }