TY - CHAP AU - Bürger, Julius AU - Lindner, Jörg K. N. ED - Bürger, Julius ID - 46980 SN - 978-3-8376-6377-8 T2 - Climate Protection, Resource Efficiency, and Sustainable Mobility - Transdisciplinary Approaches to Design and Manufacturing Technology TI - Transmission electron microscopy and transdisciplinary research ER - TY - CHAP AU - Bürger, Julius AU - Lindner, Jörg K. N. ID - 47133 SN - 978-3-8376-6377-8 T2 - Climate Protection, Resource Efficiency, and Sustainable Mobility - Transdisciplinary Approaches to Design and Manufacturing Technology TI - Transmission electron microscopy and transdisciplinary research ER - TY - CHAP AU - Bürger, Julius AU - Lindner, Jörg K. N. ID - 47123 SN - 978-3-8376-6377-8 T2 - Climate Protection, Resource Efficiency, and Sustainable Mobility - Transdisciplinary Approaches to Design and Manufacturing Technology TI - Transmission electron microscopy and transdisciplinary research ER - TY - JOUR AU - Bürger, Julius AU - Venugopal, Harikrishnan AU - Kool, Daniel AU - de los Arcos, Teresa AU - Gonzalez Orive, Alejandro AU - Grundmeier, Guido AU - Brassat, Katharina AU - Lindner, Jörg K.N. ID - 34651 IS - 26 JF - Advanced Materials Interfaces KW - General Medicine SN - 2196-7350 TI - High‐Resolution Study of Changes in Morphology and Chemistry of Cylindrical PS‐ b ‐PMMA Block Copolymer Nanomasks during Mask Development VL - 9 ER - TY - JOUR AU - Meier, Falco AU - Littmann, Mario AU - Bürger, Julius AU - Riedl, Thomas AU - Kool, Daniel AU - Lindner, Jörg AU - Reuter, Dirk AU - As, Donat Josef ID - 35232 JF - physica status solidi (b) KW - Condensed Matter Physics KW - Electronic KW - Optical and Magnetic Materials SN - 0370-1972 TI - Selective Area Growth of Cubic Gallium Nitride in Nanoscopic Silicon Dioxide Masks ER - TY - JOUR AU - Bürger, Julius AU - Venugopal, Harikrishnan AU - Kool, Daniel AU - de los Arcos de Pedro, Maria Teresa AU - Gonzalez Orive, Alejandro AU - Grundmeier, Guido AU - Brassat, Katharina AU - Lindner, Jörg ID - 34086 IS - 26 JF - Advanced Materials Interfaces KW - General Medicine SN - 2196-7350 TI - High‐Resolution Study of Changes in Morphology and Chemistry of Cylindrical PS‐ b ‐PMMA Block Copolymer Nanomasks during Mask Development VL - 9 ER - TY - JOUR AB - Block copolymer (BCP) self-assembly is a promising tool for next generation lithography as microphase separated polymer domains in thin films can act as templates for surface nanopatterning with sub-20 nm features. The replicated patterns can, however, only be as precise as their templates. Thus, the investigation of the morphology of polymer domains is of great importance. Commonly used analytical techniques (neutron scattering, scanning force microscopy) either lack spatial information or nanoscale resolution. Using advanced analytical (scanning) transmission electron microscopy ((S)TEM), we provide real space information on polymer domain morphology and interfaces between polystyrene (PS) and polymethylmethacrylate (PMMA) in cylinder- and lamellae-forming BCPs at highest resolution. This allows us to correlate the internal structure of polymer domains with line edge roughnesses, interface widths and domain sizes. STEM is employed for high-resolution imaging, electron energy loss spectroscopy and energy filtered TEM (EFTEM) spectroscopic imaging for material identification and EFTEM thickness mapping for visualisation of material densities at defects. The volume fraction of non-phase separated polymer species can be analysed by EFTEM. These methods give new insights into the morphology of polymer domains the exact knowledge of which will allow to improve pattern quality for nanolithography. AU - Bürger, Julius AU - Kunnathully, Vinay AU - Kool, Daniel AU - Lindner, Jörg AU - Brassat, Katharina ID - 34092 IS - 1 JF - Nanomaterials KW - General Materials Science KW - General Chemical Engineering SN - 2079-4991 TI - Characterisation of the PS-PMMA Interfaces in Microphase Separated Block Copolymer Thin Films by Analytical (S)TEM VL - 10 ER - TY - JOUR AU - Bürger, Julius AU - Riedl, Thomas AU - Lindner, Jörg ID - 34088 JF - Ultramicroscopy KW - Instrumentation KW - Atomic and Molecular Physics KW - and Optics KW - Electronic KW - Optical and Magnetic Materials SN - 0304-3991 TI - Influence of lens aberrations, specimen thickness and tilt on differential phase contrast STEM images VL - 219 ER - TY - JOUR AB - 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). AU - Engelkemeier, Katja AU - Lindner, Jörg AU - Bürger, Julius AU - Vaupel, Kathrin AU - Hartmann, Marc AU - Tiemann, Michael AU - Hoyer, Kay-Peter AU - Schaper, Mirko ID - 24100 JF - Nanotechnology SN - 0957-4484 TI - Nano-architectural complexity of zinc oxide nanowall hollow microspheres and their structural properties VL - 31 ER - TY - JOUR AU - Meinderink, Dennis AU - Nolkemper, Karlo J.R. AU - Bürger, Julius AU - Orive, Alejandro G. AU - Lindner, Jörg K.N. AU - Grundmeier, Guido ID - 22687 JF - Surface and Coatings Technology SN - 0257-8972 TI - Spray coating of poly(acrylic acid)/ZnO tetrapod adhesion promoting nanocomposite films for polymer laminates ER - TY - JOUR AU - Engelkemeier, Katja AU - Lindner, Jörg K N AU - Bürger, Julius AU - Vaupel, Kathrin AU - Hartmann, Marc AU - Tiemann, Michael AU - Hoyer, Kay-Peter AU - Schaper, Mirko ID - 41524 IS - 9 JF - Nanotechnology KW - Electrical and Electronic Engineering KW - Mechanical Engineering KW - Mechanics of Materials KW - General Materials Science KW - General Chemistry KW - Bioengineering SN - 0957-4484 TI - Nano-architectural complexity of zinc oxide nanowall hollow microspheres and their structural properties VL - 31 ER - TY - JOUR AB - 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. AU - Brassat, Katharina AU - Ramakrishnan, Saminathan AU - Bürger, Julius AU - Hanke, Marcel AU - Doostdar, Mahnaz AU - Lindner, Jörg AU - Grundmeier, Guido AU - Keller, Adrian ID - 3912 JF - Langmuir SN - 0743-7463 TI - On the Adsorption of DNA Origami Nanostructures in Nanohole Arrays ER - TY - JOUR AU - Brassat, Katharina AU - Ramakrishnan, Saminathan AU - Bürger, Julius AU - Hanke, Marcel AU - Doostdar, Mahnaz AU - Lindner, Jörg AU - Grundmeier, Guido AU - Keller, Adrian ID - 22664 JF - Langmuir SN - 0743-7463 TI - On the Adsorption of DNA Origami Nanostructures in Nanohole Arrays VL - 34 ER - TY - CONF AU - Riedl, Thomas AU - Bürger, Julius AU - Kunnathully, Vinay AU - Wiegand, Marie AU - Duschik, K. AU - Ramermann, D. AU - Ennen, I. AU - Hertle, Y. AU - Schaper, Mirko AU - Hellweg, T. AU - Hütten, A. AU - Lindner, Jörg ID - 4447 TI - Nanostructure Research using Transmission Electron Microscopy at the new OWL Analytic Centre ER - TY - JOUR AB - Bottom-up patterning techniques allow for the creation of surfaces with ordered arrays of nanoscale features on large areas. Two bottom-up techniques suitable for the formation of regular nanopatterns on different length scales are nanosphere lithography (NSL) and block copolymer (BCP) lithography. In this paper it is shown that NSL and BCP lithography can be combined to easily design hierarchically nanopatterned surfaces of different materials. Nanosphere lithography is used for the pre-patterning of surfaces with antidots, i.e. hexagonally arranged cylindrical holes in thin films of Au, Pt and TiO2 on SiO2, providing a periodic chemical and topographical contrast on the surface suitable for templating in subsequent BCP lithography. PS-b-PMMA BCP is used in the second self-assembly step to form hexagonally arranged nanopores with sub-20 nm diameter within the antidots upon microphase separation. To achieve this the microphase separation of BCP on planar surfaces is studied, too, and it is demonstrated for the first time that vertical BCP nanopores can be formed on TiO2, Au and Pt films without using any neutralization layers. To explain this the influence of surface energy, polarity and roughness on the microphase separation is investigated and discussed along with the wetting state of BCP on NSL-pre-patterned surfaces. The presented novel route for the creation of advanced hierarchical nanopatterns is easily applicable on large-area surfaces of different materials. This flexibility makes it suitable for a broad range of applications, from the morphological design of biocompatible surfaces for life science to complex pre-patterns for nanoparticle placement in semiconductor technology. AU - Brassat, Katharina AU - Kool, Daniel AU - Bürger, Julius AU - Lindner, Jörg ID - 3921 IS - 21 JF - Nanoscale SN - 2040-3364 TI - Hierarchical nanopores formed by block copolymer lithography on the surfaces of different materials pre-patterned by nanosphere lithography VL - 10 ER - TY - CONF AU - Brassat, Katharina AU - Kool, Daniel AU - Bürger, Julius AU - Lindner, Jörg ID - 3952 TI - Micro- and nanopatterned surfaces with tailored chemical and topographical contrast by self-assembly techniques ER - TY - JOUR AB - Switchable two dimensional liquid crystal diffraction gratings are promising can- didates in beam steering devices, multiplexers and holographic displays. For these areas of applications a high degree of integration in optical systems is much sought-after. In the context of diffraction gratings this means that the angle of diffraction should be rather high, which typically poses a problem as the fabrication of small grating periods is challenging. In this paper, we propose the use of nanosphere lithography (NSL) for the fabrication of two-dimensionally structured electrodes with a periodicity of a few micrometers. NSL is based on the self-assembly of micro- or nanometer sized spheres into monolayers. It allows for easy substrate structuring on wafer scale. The manufactured electrode is combined with a liquid crystalline polymer-stabilized blue phase, which facilitates sub-millisecond electrical switching of the diffraction efficiency at adiffractionangle of 21.4°. AU - Wahle, M. AU - Brassat, Katharina AU - Ebel, J. AU - Bürger, Julius AU - Lindner, Jörg AU - Kitzerow, Heinz-Siegfried ID - 3997 IS - 19 JF - Optics Express 25 TI - Two-dimensional switchable blue phase gratings manufactured by nanosphere lithography VL - 25 ER -