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Molybdenum trioxide (MoO3) in-plane anisotropy has increasingly attracted the attention of the scientiﬁc community in the last few years. Many of the observed in-plane anisotropic properties stem from the anisotropic refractive index and elastic constants of the material but a comprehensive analysis of these fundamental properties is still lacking. Here we employ Raman and micro-reﬂectance measurements, using polarized light, to determine the angular dependence of the refractive index of thin MoO3 ﬂakes and we study the directional dependence of the MoO3 Young’s modulus using the buckling metrology method. We found that MoO3 displays one of the largest in-plane anisotropic mechanical properties reported for 2D materials so far.
S. Puebla, R. D’Agosta, G. Sanchez-Santolino, et al. In-plane anisotropic optical and mechanical properties of two-dimensional MoO3. npj 2D Mater Appl 5, 37
© The Author(s) 2021