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Enhanced Raman Scattering on Nine 2D van der Waals Materials.

Hikari KitadaiXingzhi WangNannan MaoShengxi HuangXi Ling
Published in: The journal of physical chemistry letters (2019)
Since the discovery of graphene-enhanced Raman scattering in 2010, other 2D materials have been reported to show a Raman enhancement effect on molecules adsorbed on their surfaces. The mechanism for this phenomenon, however, still remains elusive. Here we performed a comparative investigation of the Raman enhancement effect on nine 2D materials with an identical number of copper phthalocyanine (CuPc) as probe molecules. Furthermore, the degree of charge transfer for different CuPc/2D material combinations was calculated, and a positive correlation with enhancement factors was observed, providing evidence to support the charge-transfer-dominated chemical mechanism for this amplification. This study also suggests that Raman enhancement spectroscopy can be used as a nondestructive and rapid probe for the interface interaction between molecules and 2D materials, crucial for organic molecule/2D material-based electronic and optoelectronic devices.
Keyphrases
  • quantum dots
  • small molecule
  • photodynamic therapy
  • living cells
  • raman spectroscopy
  • high resolution
  • single molecule
  • mass spectrometry
  • room temperature
  • water soluble
  • fluorescent probe
  • solid state