72 research outputs found
Wrinkled few-layer graphene as highly efficient load bearer
Multilayered graphitic materials are not suitable as load-bearers due to
their inherent weak interlayer bonding (for example, graphite is a solid
lubricant in certain applications). This situation is largely improved when
two-dimensional (2-D) materials such as a monolayer (SLG) graphene are
employed. The downside in these cases is the presence of thermally or
mechanically induced wrinkles which are ubiquitous in 2-D materials. Here we
set out to examine the effect of extensive large wavelength/ amplitude
wrinkling on the stress transfer capabilities of exfoliated simply-supported
graphene flakes. Contrary to common belief we present clear evidence that this
type of "corrugation" enhances the load bearing capacity of few-layer graphene
as compared to 'flat' specimens. This effect is the result of the significant
increase of the graphene/polymer interfacial shear stress per increment of
applied strain due to wrinkling and paves the way for designing affordable
graphene composites with highly improved stress-transfer efficiency.Comment: 20 pages, 6 figure
Tuning the electronic properties of monolayer and bilayer transition metal dichalcogenide compounds under direct out-of-plane compression
The band-gap modulation of atomically thin semiconductor transition metal dichalcogenides (MX; M = Mo or W, X = S or Se) under direct out-of-plane compression is systematically studied by means of the density functional theory (DFT) formalism including spin-orbit coupling (SOC) and dispersion correction (D3). The out-of-plane compared with other regimes stress regime significantly reduces the pressure threshold at which the semimetal state is achieved (2.7-3.1 and 1.9-3.2 GPa for mono- and bilayer systems, respectively). Structural, electronic and bonding properties are investigated for a better understanding of the electronic transitions achieved with compression. A notable relationship with the formal ionic radius (M and X) is obtained. On one hand, the monolayer systems with the smallest transition metal radius (Mo < W) reach the semimetal state at lower stress, on the other hand, for bilayer specimens the transition to semimetal is observed earlier for compounds with the smallest chalcogenide radius (S < Se). Moreover, the appearance of non-covalent interaction (NCI) domains in the semimetal state confirms that the out-of-plane compression promotes the interaction between sulfur atoms in the single layered systems and reduces the interlayer space in bilayer configurations. Our predictions, supported by experimental evidences in the case of monolayered MoS, demonstrate new alternative methods for tuning the electronic properties of transition metal dichalcogenides under direct out-of-plane compression
Probing the local dielectric function of WS2 on an Au substrate by near field optical microscopy operating in the visible spectral range
The optoelectronic properties of nanoscale systems such as carbon nanotubes (CNTs), graphene nanoribbons and transition metal dichalcogenides (TMDCs) are determined by their dielectric function. This complex, frequency dependent function is affected by excitonic resonances, charge transfer effects, doping, sample stress and strain, and surface roughness. Knowledge of the dielectric function grants access to a material’s transmissive and absorptive characteristics. Here we use the dual scanning near field optical microscope (dual s-SNOM) for imaging local dielectric variations and extracting dielectric function values using a pre-established mathematical inversion method. To demonstrate our approach, we studied a monolayer of WS2 on bulk Au and identified two areas with differing levels of charge transfer. The experiments highlight a further advantage of the technique: the dielectric function of contaminated samples can be measured, as dirty areas can be easily identified and excluded for the calculation, being important especially for exfoliated 2D materials (Rodriguez et al., 2021). Our measurements are corroborated by atomic force microscopy (AFM), Kelvin force probe microscopy (KPFM), photoluminescence (PL) intensity mapping, and tip enhanced photoluminescence (TEPL). We extracted local dielectric variations from s-SNOM images and confirmed the reliability of the obtained values with spectroscopic imaging ellipsometry (SIE) measurements
Failure Processes in Embedded Monolayer Graphene under Axial Compression
Exfoliated monolayer graphene flakes were embedded in a polymer matrix and
loaded under axial compression. By monitoring the shifts of the 2D Raman
phonons of rectangular flakes of various sizes under load, the critical strain
to failure was determined. Prior to loading care was taken for the examined
area of the flake to be free of residual stresses. The critical strain values
for first failure were found to be independent of flake size at a mean value of
-0.60 % corresponding to a yield stress of -6 GPa. By combining Euler mechanics
with a Winkler approach, we show that unlike buckling in air, the presence of
the polymer constraint results in graphene buckling at a fixed value of strain
with an estimated wrinkle wavelength of the order of 1-2 nm. These results were
compared with DFT computations performed on analogue coronene/ PMMA oligomers
and a reasonable agreement was obtained.Comment: 28 pages. Manuscript 20 pages, 8 figures. Supporting information 10
pages, 6 figure
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