A5042394938- Graphene research and applications
- Carbon Nanotubes in Composites
- Fullerene Chemistry and Applications
- Boron and Carbon Nanomaterials Research
- Diamond and Carbon-based Materials Research
- Molecular Junctions and Nanostructures
- Advancements in Battery Materials
- Quantum and electron transport phenomena
- 2D Materials and Applications
- Physics of Superconductivity and Magnetism
- Mechanical and Optical Resonators
- Advanced Chemical Physics Studies
- Electron and X-Ray Spectroscopy Techniques
- Surface and Thin Film Phenomena
- Supercapacitor Materials and Fabrication
- Nanotechnology research and applications
- Advanced Electron Microscopy Techniques and Applications
- Force Microscopy Techniques and Applications
- Covalent Organic Framework Applications
- Gas Sensing Nanomaterials and Sensors
- Graphite, nuclear technology, radiation studies
- MXene and MAX Phase Materials
- Chemical and Physical Properties of Materials
- Nanopore and Nanochannel Transport Studies
- Magnetic properties of thin films
University of Vienna
2016-2025
Staats- und Universitätsbibliothek Bremen
2021
University of Bremen
2021
FH Campus Wien
2015-2019
Austrian Economics Center
2016-2019
TU Wien
2012-2017
Arizona State University
2017
Center for Integrated Quantum Science and Technology
2014-2016
Universität Ulm
2016
Leibniz Institute for Solid State and Materials Research
2000-2011
We present momentum-dependent measurements of the density response function bulk samples purified single-wall nanotubes probed by electron energy loss spectroscopy. Carbon support excitations between both delocalized and localized electronic states. The $\ensuremath{\pi}$ plasmon exhibits a q dependence similar to that graphite plane, signaling graphitelike nature nanotube system along tube axis. In contrast, interband singularities in states observed at low have vanishingly small dispersion...
An important issue in nanoelectromechanical systems is developing small electrically driven motors. We report on an artificial nanofabricated motor which one short carbon nanotube moves relative to another coaxial nanotube. A cargo attached ablated outer wall of a multiwalled that can rotate and/or translate along the inner The motion actuated by imposing thermal gradient nanotube, allows for subnanometer displacements, as opposed electromigration or random walk effect.
We show by angle-resolved photoemission spectroscopy that a tunable gap in quasi-free-standing monolayer graphene on Au can be induced hydrogenation. The size of the controlled via hydrogen loading and reaches approximately 1.0 eV for coverage 8%. local rehybridization from sp(2) to sp(3) chemical bonding is observed X-ray photoelectron absorption allows determination amount chemisorbed hydrogen. formation completely reversible annealing without damaging graphene. Calculations dependent core...
A universal set of third--nearest neighbour tight--binding (TB) parameters is presented for calculation the quasiparticle (QP) dispersion $N$ stacked $sp^2$ graphene layers ($N=1... \infty$) with $AB$ stacking sequence. The QP bands are strongly renormalized by electron--electron interactions which results in a 20% increase nearest in--plane and out--of--plane TB when compared to band structure from density functional theory. With new we determine Fermi surface evaluate exciton energies,...
Carbon nanotubes undoubtedly take a leading position in nanotechnology research owing to their well-known outstanding structural and electronic properties. Inspired by this, hybrid functionalized tubular structures have been constructed via several modification paths that involve the presence of molecules, generation defects, partial or full replacement carbon atoms, always maintaining nanotube structure. The possibilities are countless. However, this review is mainly dedicated giving...
Tensor network algorithms provide a suitable route for tackling real-time dependent problems in lattice gauge theories, enabling the investigation of out-of-equilibrium dynamics. We analyze U(1) theory (1+1) dimensions presence dynamical matter different mass and electric field couplings, akin to quantum-electrodynamics one-dimension, which displays string-breaking: confining string between charges can spontaneously break during quench experiments, giving rise charge-anticharge pairs...
We have measured a strictly linear $\ensuremath{\pi}$ plasmon dispersion along the axis of individualized single-wall carbon nanotubes, which is completely different from dispersions graphite or bundled nanotubes. Comparative ab initio studies on graphene-based systems allow us to reproduce dispersions. This suggests that nanotubes provide viable experimental access collective electronic excitations graphene, and it validates use graphene understand In particular, calculations reveal local...
The influence of the synthesis parameters on mean characteristics single-wall carbon nanotubes in soot produced by laser vaporization graphite has been analyzed using optical absorption spectroscopy. abundance and diameter were found to be most influenced furnace temperature cobalt/nickel catalyst mixing ratio. Via an analysis fine structure spectra, existence preferred nanotube diameters established their related fractional could determined. results are consistent with located mainly around...
A catalytic reaction inside a single-walled carbon nanotube is demonstrated by using encapsulated ferrocene molecules as precursors. combined spectroscopic and microscopic study unravels the mechanism of inner tube growth. This confined process provides for controlled iron growing double-walled nanotubes represents new route materials design.
Conjugated microporous polymers (CMPs) are usually obtained as amorphous or semicrystalline powders. Their insolubility and nonprocessability considered key bottlenecks that impede CMP applications. In this study, light-emitting, nanofibrous films were fabricated by electrospinning CMP/poly(lactic acid) (PLA) mixtures. The resulting show a high flexibility combined with porosity surface-area-to-volume ratios. CMP-based have been used sensitive sensors in the detection of nitroaromatic...
We show that gauge invariant quantum link models, Abelian and non-Abelian, can be exactly described in terms of tensor networks states. Quantum models represent an ideal bridge between high-energy cold atom physics, as they used atoms optical lattices to study lattice theories. In this framework, we characterize the phase diagram a $(1+1)\mathrm{D}$ version Schwinger model external classical background electric field: transition from charge parity ordered with nonzero flux disordered one net...
Abstract The verification of a successful covalent functionalization graphene and related carbon allotropes can easily be carried out by Raman spectroscopy. Nevertheless, the unequivocal assignment resolution individual lattice modes associated with binding addends was elusive up to now. Here we present an in situ study controlled potassium intercalated graphite, revealing several new bands appearing D-region spectrum. evolution these increasing degree from low moderate levels provides basis...
Microporous, pillared graphene-based frameworks are generated in a simple functionalization/coupling procedure starting from reduced graphene oxide. They used for the fabrication of high-performance supercapacitor devices.
Abstract Quantum technologies will ultimately require manipulating many-body quantum systems with high precision. Cold atom experiments represent a stepping stone in that direction: degree of control has been achieved on increasing complexity. However, this is still sub-optimal. In many scenarios, achieving fast transformation crucial to fight against decoherence and imperfection effects. Optimal theory believed be the ideal candidate bridge gap between early stage proof-of-principle...
Increasing demands in the field of sensing, especially for gas detection applications, require new approaches to chemical sensors. Metal-organic frameworks (MOFs) can play a decisive role owing their outstanding performances regarding selectivity and sensitivity. The tetrathiafulvalene (TTF)-infiltrated MOF, Co-MOF-74, has been prepared following host-guest concept evaluated resistive sensing. Co-MOF-74-TTF crystal morphology characterized via X-ray diffraction scanning electron microscopy,...
We present detailed multi frequency resonant Raman measurements of potassium graphite intercalation compounds (GICs). From a well controlled and consecutive in-situ high temperature de-intercalation approach the response each stage up to VI is identified. The positions G 2D lines as function staging depend on charge transfer from K layers lattice expansion. Ab-initio calculations density electronic band-structure demonstrate that most (but not all) transferred remains graphene sheets...
Transparent, highly percolated networks of regioregular poly(3-hexylthiophene) (rr-P3HT)-wrapped semiconducting single-walled carbon nanotubes (s-SWNTs) are deposited, and the charge transfer processes these nanohybrids studied using spectroscopic electrical measurements. The data disclose hole doping s-SWNTs by polymer, challenging prevalent electron-doping hypothesis. Through controlled fabrication, high- to low-density nanohybrid achieved, with hybrid nanotube tested as transport layers...