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Themed collection Editor’s Choice: Optical Spectroscopy of 2D materials

19 items
Review Article

Review on the Raman spectroscopy of different types of layered materials

Raman spectroscopy continues to stimulate the explorations on different types of layered materials.

Graphical abstract: Review on the Raman spectroscopy of different types of layered materials
Communication

Anomalous lattice vibrations of CVD-grown monolayer MoS2 probed using linear polarized excitation light

Anomalous lattice vibrations are observed in CVD-grown monolayer MoS2 when rotating the sample and using the linear polarization incident light.

Graphical abstract: Anomalous lattice vibrations of CVD-grown monolayer MoS2 probed using linear polarized excitation light
Open Access Paper

Hybridized intervalley moiré excitons and flat bands in twisted WSe2 bilayers

Twisted WSe2 bilayers exhibit hybridized K–Λ excitons with flat moiré bands, which become visible through phonon-assisted photoluminescence.

Graphical abstract: Hybridized intervalley moiré excitons and flat bands in twisted WSe2 bilayers
From the themed collection: Recent Open Access Articles
Paper

Realising biaxial reinforcement via orientation-induced anisotropic swelling in graphene-based elastomers

The orientation of graphene contributed to anisotropic reinforcement, since swelling was restrained in the in-plane direction. The Raman study of the 2D band shift of GNPs under biaxial strain revealed the effective biaxial modulus of graphene.

Graphical abstract: Realising biaxial reinforcement via orientation-induced anisotropic swelling in graphene-based elastomers
Open Access Paper

Stress transfer at the nanoscale on graphene ribbons of regular geometry

Experimental and theoretical investigation of true axial stress transfer on regular-exfoliated-graphene micro-ribbons which are aligned to the loading direction.

Graphical abstract: Stress transfer at the nanoscale on graphene ribbons of regular geometry
Paper

Scanning tunneling microscopy and Raman evidence of silicene nanosheets intercalated into graphite surfaces at room temperature

(a) STM image of a graphite (G) substrate after the Si deposition at RT. (b) Stable configuration of a silicene nanosheet intercalated under the outmost G layer and (c) this outmost G layer distribution of the tensile strain.

Graphical abstract: Scanning tunneling microscopy and Raman evidence of silicene nanosheets intercalated into graphite surfaces at room temperature
Paper

Exciton and phonon dynamics in highly aligned 7-atom wide armchair graphene nanoribbons as seen by time-resolved spontaneous Raman scattering

Time-resolved spontaneous Raman experiments on 7-AGNRs show the presence of a long lived excitonic dark state together with short and long lived trap states.

Graphical abstract: Exciton and phonon dynamics in highly aligned 7-atom wide armchair graphene nanoribbons as seen by time-resolved spontaneous Raman scattering
Paper

Stokes and anti-Stokes Raman scattering in mono- and bilayer graphene

The 2D mode of graphene exhibits significant frequency discrepancies between its Stokes and anti-Stokes components, making it possible to probe the nonlinear phonon dispersion of the iTO branch near K.

Graphical abstract: Stokes and anti-Stokes Raman scattering in mono- and bilayer graphene
Paper

Probing the nanoscale light emission properties of a CVD-grown MoS2 monolayer by tip-enhanced photoluminescence

The concurrent analysis of the morphological and optical properties demonstrates that TEPL is a unique tool to study 2D materials at the nanoscale.

Graphical abstract: Probing the nanoscale light emission properties of a CVD-grown MoS2 monolayer by tip-enhanced photoluminescence
Paper

Remote excitation and detection of surface-enhanced Raman scattering from graphene

We demonstrate the remote excitation and detection of surface-enhanced Raman scattering (SERS) from graphene using a silver nanowire as a plasmonic waveguide.

Graphical abstract: Remote excitation and detection of surface-enhanced Raman scattering from graphene
Paper

Near-field exciton imaging of chemically treated MoS2 monolayers

Modification of local exciton emission in monolayer MoS2 by chemical treatments is spatially uneven as revealed by near field imaging.

Graphical abstract: Near-field exciton imaging of chemically treated MoS2 monolayers
Paper

Resolving the optical anisotropy of low-symmetry 2D materials

Azimuthal-dependence reflectance difference microscopy was developed to visualize and characterize the optical anisotropy of low-symmetry 2D materials.

Graphical abstract: Resolving the optical anisotropy of low-symmetry 2D materials
Paper

Giant gap-plasmon tip-enhanced Raman scattering of MoS2 monolayers on Au nanocluster arrays

In this article, we present the results of a gap-plasmon tip-enhanced Raman scattering study of MoS2 monolayers deposited on a periodic array of Au nanostructures on a silicon substrate forming a two dimensional (2D) crystal/plasmonic heterostructure.

Graphical abstract: Giant gap-plasmon tip-enhanced Raman scattering of MoS2 monolayers on Au nanocluster arrays
Paper

Optical trapping and optical force positioning of two-dimensional materials

Optical forces are used for trapping, characterization, and positioning of layered materials (hBN, MoS2, and WS2) obtained by liquid phase exfoliation.

Graphical abstract: Optical trapping and optical force positioning of two-dimensional materials
Paper

Interlayer bond polarizability model for stacking-dependent low-frequency Raman scattering in layered materials

A simple model is developed to reveal the stacking dependence of Raman intensities of interlayer vibrations in 2D materials.

Graphical abstract: Interlayer bond polarizability model for stacking-dependent low-frequency Raman scattering in layered materials
Paper

Plasmon–trion and plasmon–exciton resonance energy transfer from a single plasmonic nanoparticle to monolayer MoS2

Tunable plasmon–trion and plasmon–exciton resonance energy transfer from a single Au nanotriangle (AuNT) to monolayer MoS2 are demonstrated.

Graphical abstract: Plasmon–trion and plasmon–exciton resonance energy transfer from a single plasmonic nanoparticle to monolayer MoS2
Paper

The optical response of monolayer, few-layer and bulk tungsten disulfide

We present a comprehensive optical study of thin flakes of tungsten disulfide (WS2) with thickness ranging from mono- to octalayer and in the bulk limit.

Graphical abstract: The optical response of monolayer, few-layer and bulk tungsten disulfide
Paper

Raman signature and phonon dispersion of atomically thin boron nitride

The intrinsic Raman signature and phonon dispersion of mono- and few-layer BN have been revealed by both experiment and simulation.

Graphical abstract: Raman signature and phonon dispersion of atomically thin boron nitride
Paper

Near-field spectral mapping of individual exciton complexes of monolayer WS2 correlated with local defects and charge population

Spatial and spectral maps of excitons, trions and localized defect-bound excitons in monolayer WS2 are revealed by near-field imaging.

Graphical abstract: Near-field spectral mapping of individual exciton complexes of monolayer WS2 correlated with local defects and charge population
19 items

About this collection

Characterization of nanomaterials is of crucial importance as it allows us to get insights on the fundamental properties of novel materials and to tailor them for applications. Optical spectroscopy, amongst all techniques, allows simple and quick inspection of such properties, hence it has been widely applied to nanomaterials.

In this online collection, we have selected an array of two-dimensional (2D) materials related research articles and reviews recently published in Nanoscale, providing examples on use of a wide range of optical characterization techniques, ranging from Raman spectroscopy to absorption and photoluminescence spectroscopy.

In addition to traditional characterization techniques, we have also selected manuscripts reporting emerging techniques, such as near-field spectroscopy and optical trapping, which could further improve the characterization of 2D materials, by providing higher sensitivity and spatial resolution. We hope that the readers find this themed collection informative and useful.

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