80 research outputs found
Graphene on Rh(111): STM and AFM studies
The electronic and crystallographic structure of the graphene/Rh(111) moir\'e
lattice is studied via combination of density-functional theory calculations
and scanning tunneling and atomic force microscopy (STM and AFM). Whereas the
principal contrast between hills and valleys observed in STM does not depend on
the sign of applied bias voltage, the contrast in atomically resolved AFM
images strongly depends on the frequency shift of the oscillating AFM tip. The
obtained results demonstrate the perspectives of application atomic force
microscopy/spectroscopy for the probing of the chemical contrast at the
surface.Comment: manuscript and supplementary information; submitted to Appl. Phys.
Lett. on 01.03.201
Scanning tunneling and atomic force microscopies studies
The electronic and crystallographic structure of the graphene/Rh(111) moiré
lattice is studied via combination of density-functional theory calculations
and scanning tunneling and atomic force microscopy(STM and AFM). Whereas the
principal contrast between hills and valleys observed in STM does not depend
on the sign of applied bias voltage, the contrast in atomically resolved AFM
images strongly depends on the frequency shift of the oscillating AFM tip. The
obtained results demonstrate the perspectives of application atomic force
microscopy/spectroscopy for the probing of the chemical contrast at the
surface
Ion and polymer dynamics in polymer electrolytes PPO-LiClO4: II. 2H and 7Li NMR stimulated-echo experiment
We use 2H NMR stimulated-echo spectroscopy to measure two-time correlation
functions characterizing the polymer segmental motion in polymer electrolytes
PPO-LiClO4 near the glass transition temperature Tg. To investigate effects of
the salt on the polymer dynamics, we compare results for different ether oxygen
to lithium ratios, namely, 6:1, 15:1, 30:1 and infinity. For all compositions,
we find nonexponential correlation functions, which can be described by a
Kohlrausch function. The mean correlation times show quantitatively that an
increase of the salt concentration results in a strong slowing down of the
segmental motion. Consistently, for the high 6:1 salt concentration, a high
apparent activation energy E_a=4.1eV characterizes the temperature dependence
of the mean correlation times at Tg < T< 1.1T_g, while smaller values E_a=2.5eV
are observed for moderate salt contents. The correlation functions are most
nonexponential for 15:1 PPO-LiClO4, whereas the stretching is reduced for
higher and lower salt concentrations. A similar dependence of the correlation
functions on the evolution time in the presence and in the absence of ions
indicates that addition of salt hardly affects the reorientational mechanism.
For all compositions, mean jump angles of about 15 degree characterize the
segmental reorientation. In addition, comparison of results from 2H and 7Li NMR
stimulated-echo experiments suggests a coupling of ion and polymer dynamics in
15:1 PPO-LiClO4.Comment: 14 pages, 12 figure
Surface faceting and reconstruction of ceria nanoparticles
The surface atomic arrangement of metal oxides determines their physical and chemical properties, and the ability to control and optimize structural parameters is of crucial importance for many applications, in particular in heterogeneous catalysis and photocatalysis. Whereas the structures of macroscopic single crystals can be determined with established methods, for nanoparticles (NPs), this is a challenging task. Herein, we describe the use of CO as a probe molecule to determine the structure of the surfaces exposed by rod-shaped ceria NPs. After calibrating the CO stretching frequencies using results obtained for different ceria single-crystal surfaces, we found that the rod-shaped NPs actually restructure and expose {111} nanofacets. This finding has important consequences for understanding the controversial surface chemistry of these catalytically highly active ceria NPs and paves the way for the predictive, rational design of catalytic materials at the nanoscale.Postprint (author's final draft
Achieving high effective Q-factors in ultra-high vacuum dynamic force microscopy
Lübbe J, Tröger L, Torbrügge S, et al. Achieving high effective Q-factors in ultra-high vacuum dynamic force microscopy. Measurement Science and Technology. 2010;21(12): 125501.The effective Q-factor of the cantilever is one of the most important figures-of-merit for a non-contact atomic force microscope (NC-AFM) operated in ultra-high vacuum (UHV). We provide a comprehensive discussion of all effects influencing the Q-factor and compare measured Q-factors to results from simulations based on the dimensions of the cantilevers. We introduce a methodology to investigate in detail how the effective Q-factor depends on the fixation technique of the cantilever. Fixation loss is identified as a most important contribution in addition to the hitherto discussed effects and we describe a strategy for avoiding fixation loss and obtaining high effective Q-factors in the force microscope. We demonstrate for room temperature operation, that an optimum fixation yields an effective Q-factor for the NC-AFM measurement in UHV that is equal to the intrinsic value of the cantilever
Unravelling the atomic structure of cross-linked (1 x 2) TiO2(110)
Pieper HH, Venkataramani K, TorbrĂĽgge S, et al. Unravelling the atomic structure of cross-linked (1 x 2) TiO2(110). Physical Chemistry Chemical Physics. 2010;12(39):12436-12441.The cross-linked (1 x 2) reconstruction of TiO2(110) is a frequently observed phase reflecting the surface structure of titania in a significantly reduced state. Here we resolve the atomic scale structure of the cross-linked (1 x 2) phase with dynamic scanning force microscopy operated in the non-contact mode (NC-AFM). From an analysis of the atomic-scale contrast patterns of the titanium and oxygen sub-structures obtained by imaging the surface with AFM tips having different tip apex termination, we infer the hitherto most accurate model of the atomic structure of the cross-linked (1 x 2) phase. Our findings suggest that the reconstruction is based on added rows in [001] direction built up of Ti3O6 units with an uninterrupted central string of oxygen atoms accompanied by a regular sequence of cross-links consisting of linear triples of additional oxygen atoms in between the rows. The new insight obtained from NC-AFM solves previous controversy about the cross-linked TiO2(110) surface structure, since previously proposed models based on cross-links with a lower O content do not appear to be consistent with the atom-resolved data presented here. Instead, our measurements strongly support the Ti3O6 motif to be the structural base of the cross-linked (1 x 2) reconstruction of TiO2(110)
Large-scale numerical investigations of the antiferromagnetic Heisenberg icosidodecahedron
We present up to date investigations of the antiferromagnetic Heisenberg
icosidodecahedron by means of the Density Matrix Renormalization Group method.
We compare our results with modern Correlator Product State as well as Lanczos
calculations.Comment: 20 pages, 11 figure
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