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Nano Lett. 2019 Feb 13;19(2):1124-1130. doi: 10.1021/acs.nanolett.8b04433. Epub 2019 Feb 1.

Bifacial Raman Enhancement on Monolayer Two-Dimensional Materials.

Author information

1
Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , People's Republic of China.
2
Hefei National Laboratory for Physical Science at the Microscale and Synergetic Innovation Center of Quantum Information & Quantum Physics , University of Science and Technology of China , Hefei , Anhui 230026 , People's Republic of China.
3
Center for Nanophase Materials Sciences , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States.
4
National Center for Nanoscience and Technology, Chinese Academy of Sciences , Beijing 100190 , People's Republic of China.

Abstract

Understanding the charge interaction between molecules and two-dimensional (2D) materials is essential for the design of functional devices. Here, we report the bifacial Raman enhancement of molecules on monolayer graphene and hexagonal boron nitride ( h-BN). Taking advantage of the atomically thick layered structure, we show that both surfaces of 2D materials can interact with molecules and simultaneously enhance their Raman scattering. Different enhancement features were observed for monolayer graphene and h-BN. The intensity decrease of particular Raman modes of copper phthalocyanine (CuPc) on both surfaces of h-BN suggests that z-dipoles exist and are partially canceled out between the two interfaces, while the twice Raman intensities of the characteristic Raman modes of CuPc on both surfaces of graphene compared to that on one surface evidenced the charge transfer process. These results provide an approach to modify 2D materials by bifacial adsorption of molecules, and the findings can inspire the design of functional 2D material-based devices.

KEYWORDS:

Bifacial Raman enhancement; Raman scattering; charge interactions; two-dimensional materials

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