A5009624172- Carbon Nanotubes in Composites
- Graphene research and applications
- Fullerene Chemistry and Applications
- Metal-Organic Frameworks: Synthesis and Applications
- Magnetism in coordination complexes
- Rare-earth and actinide compounds
- Diamond and Carbon-based Materials Research
- Molecular Junctions and Nanostructures
- Iron-based superconductors research
- Gas Sensing Nanomaterials and Sensors
- X-ray Diffraction in Crystallography
- Transition Metal Oxide Nanomaterials
- Inorganic Chemistry and Materials
- Boron and Carbon Nanomaterials Research
- Organic and Molecular Conductors Research
- Conducting polymers and applications
- Quantum Dots Synthesis And Properties
- Quantum and electron transport phenomena
- Advancements in Battery Materials
- Crystallization and Solubility Studies
- Advanced X-ray Imaging Techniques
- Lanthanide and Transition Metal Complexes
- Electron and X-Ray Spectroscopy Techniques
- Graphite, nuclear technology, radiation studies
- Crystallography and Radiation Phenomena
University of Vienna
2016-2025
Czech Academy of Sciences, J. Heyrovský Institute of Physical Chemistry
2018-2025
TU Wien
2012-2021
Czech Academy of Sciences
2020-2021
Austrian Economics Center
2019
Arizona State University
2017
FH Campus Wien
2015
University of Surrey
2005-2013
Leibniz Institute for Solid State and Materials Research
2005-2011
Chiang Mai University
2009
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,...
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.
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,...
The full three-dimensional dispersion of the pi bands, Fermi velocities, and effective masses are measured with angle-resolved photoemission spectroscopy compared to first-principles calculations. band structure by density-functional theory underestimates slope bands trigonal warping effect. Including electron-electron correlation on level GW approximation, however, yields remarkable improvement in vicinity level. This demonstrates breakdown independent electron picture semimetallic graphite...
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...
Abstract Black phosphorus intercalation compounds (BPICs) with alkali metals (namely: K and Na) have been synthesized in bulk by solid‐state as well vapor‐phase reactions. By means of a combination situ X‐ray diffraction, Raman spectroscopy, DFT calculations the structural behavior BPICs at different stages has demonstrated for first time. Our results provide glimpse into very steps new family compounds, distinct compared to its graphite analogues (GICs), showing remarkable complexity...
The demand for high-density memory in tandem with limitations imposed by the minimum feature size of current storage devices has created a need new materials that can store information smaller volumes than currently possible. Successfully employed commercial optical data products, phase-change materials, reversibly and rapidly change from an amorphous phase to crystalline when subject heating or cooling have been identified development next generation electronic memories. There are...
Tweaking the properties of carbon nanotubes is a prerequisite for their practical applications. Here, we demonstrate fine tuning electronic single-wall via filling with ferrocene molecules. The evolution bonding and charge transfer within tube demonstrated chemical reaction filler ending up as secondary inner tube. nature interpreted well density functional theory. This work gives direct observation fine-tuned continuous amphoteric doping nanotubes.
The inherent structure of single-walled carbon nanotubes (SWCNTs) provides them tremendous value as archetypical one-dimensional (1D) solids, which exhibit van Hove singularities in their local density states, Tomonaga-Luttinger liquid behavior, ballistic transport properties, and many other aspects, features 1D quantum systems, allow the study fundamental problems. Therefore, unraveling signature peculiar electronic pristine material is a prerequisite for tracing any modification. Here, we...
Controlled doping of carbon nanotubes is elemental for their electronic applications. Here we report an approach to tune the polarity and degree single-walled via filling with nickelocene followed by encapsulated reactions. Using Raman, photoemission spectroscopy transmission electron microscopy, show that molecules transform into nickel carbides, inner reaction temperatures as low 250 °C. The efficiency determined each chemical component. Synchronous charge transfer among molecular...
Abstract Coordination polymerization leads to various metal–organic frameworks (MOFs) with unique physical properties and chemical functionalities. One of the challenges towards their applications as porous materials is make MOFs optimally conductive be used electronic components. Here, it demonstrated that Co-MOF-74, a honeycomb nano–framework one–dimensionally arranged cobalt atoms, advances its by accommodating tetracyanochinodimethan (TCNQ), an acceptor molecule. Strong intermolecular...
The excitement of nano-test-tube chemistry in a single-walled carbon nanotube is exemplified our study on electron doping nanotubes. Electron through the 1D van Hove singularity nanotubes realized via chemical reaction an encapsulated organocerium compound, CeCp3. decomposition CeCp3 inside increases level and greatly enhances density conduction electrons. transition cerium encapsulating semiconducting tubes to metallic results enhanced screening photoexcited core hole potential. This fact...
The interior of carbon nanotubes, provide a homogeneous, contaminant-free environment in which to perform nanoreactions, hence the term nano-test tubes. Here, routes for controlled growth nanotubes with defined chiral indices are presented within single-walled upon encapsulation Pt and Fe catalysts, plus source proportions. Factors affecting (e.g. temperature) examined experimentally.
We investigate, with high-resolution angle-resolved photoemission spectroscopy, the spectral function of potassium-doped quasi-free-standing graphene on Au. Angle-dependent x-ray and density functional theory calculations demonstrate that potassium intercalates into graphene/Au interface, leading to an upshift K-derived electronic band above Fermi level. This empty is what makes this system perfectly suited disentangle contributions electron-phonon coupling coming from $\ensuremath{\pi}$...
A new post-treatment method for lead–tin mixed perovskites enabling device fill factors approaching 83%.
Metal-organic frameworks (MOFs) represent a class of porous materials whose properties can be altered by doping with redox-active molecules. Despite advanced such as enhanced electrical conduction that doped MOFs exhibit, understanding physical mechanisms remains challenging because their heterogeneous nature hindering experimental observations host-guest interactions. Here, we show study charge transfer between Mn-MOF-74 and electron acceptors, 7,7,8,8-tetracyanoquinodimethane (TCNQ) XeF2,...
X-ray absorption (XAS) and core level photoelectron spectroscopy are versatile tools to site selectively study the unoccupied density of states bonding environment. Hence, they widely applied single-wall carbon nanotubes (SWCNTs) as archetypes one-dimensional solids. However, their van Hove singularities (vHs's) were indiscernible. In this paper, we unravel vHs in XAS response SWCNT. These results pave way toward a conclusive understanding interplay between charge transfer hybridization...
The global renewable energy industry awaits new battery technologies that power the future. Here we conceptualize and fabricate a halogen-ion is charged up via halogenation of water-stable metal-organic framework (MOF) made trinuclear copper triazole. A cell uses pure imidazolium ionic liquid electrolyte, binder-free carbon nanotube electrodes, one which accommodates microcrystals MOF. It offers redox potentials greater than 0.6 V, densities specific capacitances as high 7 Wh/kg 10 mAh/g,...
We have measured the valence-band photoemission and inverse spectra of single-walled carbon nanotubes (SWNTs) with mean radii 0.7 $0.64\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ encapsulating ${\mathrm{C}}_{60}$ fullerenes (peas), so-called ``peapods.'' The spectrum peas in SWNTs is obtained by subtracting empty from peapod. structures pea correspond well to those a face-centered-cubic solid. No structure observed at binding energies ranging Fermi level $({E}_{\mathrm{F}})$ onset highest...
We have investigated the low-energy electronic structure of heavy fermion superconductor $\mathrm{Ce}\mathrm{Co}{\mathrm{In}}_{5}$ by angle-resolved photoemission. focus on dispersion and peak width prominent quasi-two-dimensional Fermi surface sheet at corner Brillouin zone as a function temperature along certain $k$ directions with photon energy $h\ensuremath{\nu}=100\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$. find slight changes vector an anomalous broadening when is approached....
We have investigated the low-energy electronic structure of heavy-fermion superconductor ${\text{CeCoIn}}_{5}$ by angle-resolved photoemission and band-structure calculations. measured Fermi surface energy distribution maps along high-symmetry directions at $h\ensuremath{\nu}=100\text{ }\text{eV}$ $T=25\text{ }\text{K}$. The compound has quasi-two-dimensional Fermi-surface sheets centered $M\text{\ensuremath{-}}A$ line Brillouin zone. calculations been carried out within local-density...