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 -