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- W2073171182 abstract "We use anhydrous ferric chloride (FeCl3) to intercalate graphite flakes consisting of 2−4 graphene layers and to dope graphene monolayers. The intercalant, staging, stability, and doping of the resulting intercalation compounds (ICs) are characterized by Raman scattering. The G peak of heavily doped monolayer graphene upshifts to ∼1627 cm−1. The 2−4 layer ICs have similar upshifts, and a Lorentzian line shape for the 2D band, indicating that each layer behaves as a decoupled heavily doped monolayer. By performing Raman measurements at different excitation energies, we show that, for a given doping level, the 2D peak can be suppressed by Pauli blocking for laser energy below the doping level. Thus, multiwavelength Raman spectroscopy allows a direct measurement of the Fermi level, complementary to that derived by performing measurements at fixed excitation energy significantly higher than the doping level. This allows us to estimate a Fermi level shift of up to ∼0.9 eV. These ICs are thus ideal test-beds for the physical and chemical properties of heavily doped graphenes." @default.
- W2073171182 created "2016-06-24" @default.
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- W2073171182 date "2011-03-24" @default.
- W2073171182 modified "2023-10-14" @default.
- W2073171182 title "Intercalation of Few-Layer Graphite Flakes with FeCl<sub>3</sub>: Raman Determination of Fermi Level, Layer by Layer Decoupling, and Stability" @default.
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- W2073171182 doi "https://doi.org/10.1021/ja110939a" @default.
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