Horiba LabRAM HR Evolution: Raman Imaging of Low Frequency Bands
Analysis of Layers of Nano-Materials with ULF Filters
There are two methods to determine the number of layers of nano-materials like Graphene or Molybdenum disulfide (MoS2) with Raman spectroscopy: Measuring the intralayer vibrational modes (fingerprint spectral region) and measuring the interlayer modes (very low frequencies region).
The two methods give complementary results; the interlayer method (very low frequency) gives excellent contrast, but does not show single layers, and the intralayer modes (fingerprint) show all the layers, but with a poorer contrast, notably for higher numbers of layers.
The LabRAM HR Evolution, equipped with the ultra-low frequency ULF filters, simultaneously offers high efficiency of a single stage spectrometer, and the capability to measure the very low frequency region (down to 4 cm-1) in order to perform fast imaging of nano-materials layers. Stokes and anti-stokes low frequency bands and fingerprint region of MoS2 have been measured simultaneously with a very high spectral resolution, allowing users to obtain a fast, precise and contrasted image of the number of the MoS2 layers. Similar methods can be used for Graphene samples, for instance.
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