Bifacial Raman Enhancement on Monolayer Two-Dimensional Materials.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.  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. 
Raman
Bifacial Raman Enhancement on Monolayer Two-Dimensional Materials.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.  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. 
Raman
Bifacial Raman Enhancement on Monolayer Two-Dimensional Materials.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.  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. 
Raman
Bifacial Raman Enhancement on Monolayer Two-Dimensional Materials.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.  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. 
Raman
Bifacial Raman Enhancement on Monolayer Two-Dimensional Materials.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.  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. 
Raman