It is known that Raman spectroscopy is a sensitive characterization method that has been widely used to study 2D materials. For graphene, the layer numbers, defects, strain, and substrate effects can be determined from its Raman spectrum with the references for that graphene (G- and G+, in Nat Mater 12(9): 792-797) and MoS2 (Nano Res 2013, 6(3): 200–207). However, I am having difficulties in finding the related reports on BN ultrathin (ie. monolayer) materials. Does anyone know more about this?
Hi Liancheng:
Yes, please see "Song, et al. Nano Letters 2010 10 (8), 3209-3215" for a view of the Raman signals of thin h-BN layers.
Many papers on this topic.. see this paper by Geim & Novasolev in Small
DOI: 10.1002/smll.201001628
Dear Wang,
What are you looking for exactly? As Adrian and Sridhar mentioned, reports are there for determining single layer and multilayer BN. So, one can use UV laser (325 nm) to find that.
Moreover, unlike graphene, h-BN has only one Raman mode around 1320 cm-1. Thats why there are not much studies on extensive Raman analysis of h-BN.
I have read the paper, the Raman mode monolayered boron nitride was around 1370. Thank you Adrian Garcia ,Sridhar Vadahanambi and
Satender Kataria for forkind answers. Sorry for late response. The position changes of the mode was around 5 cm-1, the characters was not so distinct in compared with that of graphene. Perhaps that is also a reason for not much studies on Raman analysis of few layered BN
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