63 research outputs found
sj-pdf-1-asp-10.1177_00037028211067827 – Supplemental Material for Confocal Raman Microscopy for the Analysis of the Three-Dimensional Shape of Polymeric Microsphere Layers
No full textSupplemental Material, sj-pdf-1-asp-10.1177_00037028211067827 for Confocal Raman Microscopy for the Analysis of the Three-Dimensional Shape of Polymeric Microsphere Layers by Alina Syring, Zunhao Wang, Julia Molle, Hendrik Keese, Stefan Wundrack, Rainer Stosch and Tobias Voss in Applied Spectroscopy</p
Unveiling the effect of substrate on graphene via non-destructive multiscale Raman spectroscopy
No full textGraphene has now become a frontier material for various industrial applications due to its remarkable properties such as high electrical conductivity, exceptional mechanical strength and thermal conductivity. Indeed, the quality control of the produced graphene is one of the main issues to be solved for its successful application in various technologies such as flexible electronics, energy storage devices and advanced composites.The samples subject to this study were produced by Graphenea during the work of the H2020 European project CHALLENGES (realtime nano CHAracterization reLatEd techNoloGiES); in particular, these samples consists of graphene grown on copper substrates and then transferred to silicon with different values of resistivity. These samples were then characterised by the Physikalisch-Technische Bundesanstalt (PTB) and the Sapienza University of Rome. The study was mainly focused on the application of advanced optical non-destructive characterisation techniques, in particular correlative microscopy (Atomic Force Microscopy and Raman spectroscopy) and Tip-Enhanced Raman Spectroscopy (TERS), to evaluate their application for in-line quality control. Using monochromatic laser light, Raman spectroscopy can reveal valuable information about strain, defects and compositional variations, while the non-invasive nature of these techniques makes them ideal for industrial applications, allowing real-time monitoring without compromising sample integrity but with relatively low spatial resolution (diffraction-limited). In addition to conventional correlative microscopy using Raman spectroscopy and atomic force microscopy (AFM), tip-enhanced Raman spectroscopy (TERS) is emerging as a powerful tool in the arsenal of graphene characterisation techniques. Combining the high spatial resolution of scanning probe microscopy with the sensitivity of Raman spectroscopy, TERS provides not only high-resolution topographical information, but also rapid chemical mapping of graphene at the nanoscale thanks to the plasmonic effect at the tip. This technique reveals nuances in strain distribution and compositional defects at the nanoscale level, providing unprecedented insight into the local properties of graphene. Understanding the strain and compositional defects in graphene grown on copper and after transfer to silicon is crucial for tailoring the material for specific applications. The choice of substrate can significantly affect the electronic and mechanical properties of graphene, so comprehensive characterisation using advanced optical techniques is essential
Direct Growth of Patterned Graphene
No full textWeber N-E, Wundrack S, Stosch R, Turchanin A. Direct Growth of Patterned Graphene. SMALL. 2016;12(11):1440-1445
Datasets of Chatterjee et al., ACS Appl. Electron. Mater. 4, 5317 (2022), "Impact of polymer-assisted epitaxial graphene growth on various types of SiC substrates"
No full text<p>Compilation of the datasets used to generate the figures in the following journal publication:</p>
<p>"Impact of polymer-assisted epitaxial graphene growth on various types of SiC substrates"</p>
<p>by Atasi Chatterjee, Mattias Kruskopf, Stefan Wundrack, Peter Hinze, Klaus Pierz, Rainer Stosch, and Hansjoerg Scherer,</p>
<p>ACS Appl. Electron. Mater. 4, 5317 (2022),</p>
<p>DOI: 10.1021/acsaelm.2c00989.</p>This work was supported in part by the Joint Research Project GIQS (18SIB07). This project received funding from the European Metrology programme for Innovation and Research (EMPIR) co-financed by the Participating States and from the European Unions' Horizon 2020 research and innovation programme. Funder ID: 10.13039/100014132, Grant no: 18SIB07 GIQS
Mechanically Stacked 1-nm-Thick Carbon Nanosheets: Ultrathin Layered Materials with Tunable Optical, Chemical, and Electrical Properties
No full textNottbohm CT, Turchanin A, Beyer A, Stosch R, Gölzhäuser A. Mechanically Stacked 1-nm-Thick Carbon Nanosheets: Ultrathin Layered Materials with Tunable Optical, Chemical, and Electrical Properties. Small. 2011;7(7):874-883
Microplastic in Environmental Samples: Quantitative Determination and Metrological Traceability
No full textGrowth dynamics of graphene buffer layer formation on ultra-smooth SiC(0001) surfaces
No full textIn this study, the growth process of epitaxial graphene on SiC was systematically investigated. The transition from the initial buffer layer growth to the formation of the first monolayer graphene domains was studied by various techniques: atomic force microscopy, low energy electron diffraction, low energy electron microscopy, Raman spectroscopy, and scanning electron microscopy. The data show that the buffer layer formation goes along with a simultaneous SiC decomposition, which takes place as a rapid step retraction of one specific type of SiC bilayer, in good agreement with the step retraction model. Once the buffer layer coverage is completed, the resulting characteristic regular repeating terrace and step height pattern of one and two SiC bilayers turns out to be very stable against further SiC decomposition. The following initial growth of monolayer graphene domains occurs not homogeneously on all terraces, but interestingly, only on the S2 terraces along the adjacent two bilayer high terrace edges. This behavior is explained by the preferential SiC decomposition at the higher step edges and has some potential for spatial graphene growth control. The faster growth of the graphene layer on the S2 terrace can explain the different nanoscale resistivity values on these terraces measured in an earlier scanning tunneling spectroscopy study [A. Sinterhauf et al., Nat. Commun. 11, 555 (2020)].Deutsche Forschungsgemeinschaft 10.13039/50110000165
COMPARATIVE THEOLOGY AS CHALLENGE FOR THE THEOLOGY OF THE 21ST CENTURY
No full textIn this article the author first gives an introduction to his own approach to comparative theology (CT). After some introductory considerations, an outline of the idea and foundation of CT is given and is contrasted with traditional approaches to other religions; the methods, goals, and also the limits of CT are discussed; CT is differentiated from religious studies and the theology of religions; finally, CT is defended against some of its most important critiques. All in all, the author presents an approach to CT that suits Christian confessional theology, yet is open to Islamic theology as well, and which is inviting to theology as a dialogical enterprise which should be performed by Muslims and Christians and other religious believers together
A review and perspective on hybrid modeling methodologies
No full textThe term hybrid modeling refers to the combination of parametric models (typically derived from knowledge about the system) and nonparametric models (typically deduced from data). Despite more than 20 years of research, over 150 scientific publications (Agharafeie et al., 2023), and some recent industrial applications on this topic, the capabilities of hybrid models often seem underrated, misunderstood, and disregarded by other disciplines as “simply combining some models” or maybe it has gone unnoticed at all. In fact, hybrid modeling could become an enabling technology in various areas of research and industry, such as systems and synthetic biology, personalized medicine, material design, or the process industries. Thus, a systematic investigation of the hybrid model properties is warranted to scoop the full potential of machine learning, reduce experimental effort, and increase the domain in which models can predict reliably.ChemE/Product and Process Engineerin
Gender Differences in Attachment Anxiety and Avoidance and Their Association with Psychotherapy Use—Examining Students from a German University
No full textAttachment anxiety and avoidance might explain gender differences in psychotherapy use, which is generally lower in men. In addition, university students are a particularly vulnerable group for mental health problems, and understanding psychotherapy use, especially among mentally distressed male students, is pivotal. A total of 4894 students completed an online survey answering questions regarding psychotherapy use and completing the PHQ-D identifying psychological syndromes. In addition, the ECR-RD12 was used to measure attachment anxiety and avoidance. Significant gender differences for attachment anxiety and avoidance emerged, showing higher attachment anxiety in female students and higher attachment avoidance in male students. Male students used psychotherapy significantly less than female students. Male students’ attachment anxiety and avoidance predicted psychotherapy use, while for female students, only attachment anxiety emerged as a significant predictor. Attachment anxiety is positively associated with psychotherapy use, and lower attachment anxiety in men may explain lower psychotherapy use in male students
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