Raman spectravacancies (crystalBilayer graphene as a prototype of two-dimensional stacked material has recently attracted great attention. The twist angle between graphene layers adds another dimension to control its properties. In this study, we used Raman mapping to investigate the twist angle ...
RAMAN effectTERAHERTZ spectroscopyCarrier mobility and chemical doping level are essential figures of merit for graphene, and large-scale characterization of these properties and their uniformity is a prerequisite for commercialization of graphene for electronics and electrodes. However, existing mapping ...
We present Raman spectroscopy in first-, second- and higher-order vibrational modes involving 3 and 4 phonons (overtones and combination) and mapping of graphene (mono-, bi-, tri- and few-) layers, semiconducting transition metal dichalcogenides (TMDs) [molybdenum disulfide (MoS2) and tungsten ...
Hyperspectral Raman imaging is used to visualize defects in polycrystalline graphene under ion bombardment, showing zero-dimensional and one-dimensional defects in grains and at grain boundaries, respectively, and preferential self-healing at the grain boundaries. ...
We report on confocal Raman spectroscopy on a few-layer graphene flake. Adjacent single- and double-layer graphene sections allow mapping the transition in vibrational and electronic properties to a second stacked graphene sheet and with it a weak interlayer coupling. Most prominently the width of ...
Ultra-sensitive detection, mapping and monitoring of the activity of cancer cells is critical for treatment evaluation and patient care. Here, we demonstrate that a cancer cell's glycolysis-induced hyperactivity and enhanced electronegative membrane (from sialic acid) can sensitively modify the second-...
Raman mapping results showed that monolayer/bilayer graphene regions accounted for 64% of the film area. Graphene films exhibited excellent resistance to corrosion. The extremely low corrosion current density and high free corrosion potential in 3.5% NaCl aqueous (aq) solutions showed that the as-...
phonon mappingpolarized Raman measurementsRaman spectroscopy2D Raman modeWe investigate the dominant phonon wavevectors q* and the associated dominant phonon-assisted electronic transitions implied by the 2D Raman mode of graphene by combining ab initio calculations with a full two-dimensional integration ...
Fig. 4. a) Raman spectra of GO and PSU; b) Z stack of Raman maps and the relative optical image of PSU-GO 3.5% HFs, constructed by mapping the D-band region. Raman mapping and depth profiling techniques are shown in Fig. 4b and fig. S4 (ESI). All tested PSU-GO samples, includi...
Meanwhile, Raman spectroscopic mapping revealed no D band in the planes of single-layer or few-layer graphene after the plasma reaction, suggesting selective etching at the graphene edges without introducing defects in the basal plane. We found that hydrogen plasma at lower temperature (room ...