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Published on: November 28, 2017
Raman spectroscopy of 2D MoS2 on Ti3C2 MXene: the substrate effect
Ethan Pollack1, Qiaohui Zhou1, Elham Loni1
1Department of Physics and Engineering Physics, Tulane University New Orleans Louisiana 70118 USA xlu5@tulane.edu.
Abstract:
We use Raman spectroscopy to study the substrate effect of Ti3C2 MXene on the lattice vibrational modes of MoS2. We observed redshifts in the fingerprint peaks of MoS2, and explained the shifts based on their vibrational nature. The shift in the in-plane E1 2g mode is attributed to the strain effect, and the softened A1g mode associated with the out-of-plane vibration is caused by electron doping. In addition to monolayer MoS2, we show that the modulation from Ti3C2 MXene is also present in few-layer and bulk MoS2. Furthermore, we demonstrate that the laser-induced shift occurs even at low excitation power. Our results indicate that a detailed power-dependent measurement is indispensable for extracting the pure substrate effect from Raman spectroscopy.
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