Chemical tunability of the elastic constants of α-MoO₃, a two-dimensional layered oxide, is demonstrated with mutability on the order of tens of GPa, simply by choice of a metal intercalant including Au, Cr, Fe, Ge, Mn, and Ni. Using Brillouin laser light scattering from confined acoustic phonons in nanometer-thick materials, the in-plane angular dispersion of the quantized acoustic phonon branches of 2D layered, intercalated MoO₃ is measured and used to determine the bulk modulus (K), Young’s moduli (E₁₁, E₂₂, and E₃₃), each of the nine independent elastic tensor elements (c_ij), and the thickness. Intercalation of metals generally reduces the anisotropy in MoO₃ except in Ge-MoO₃, for which the in-plane longitudinal elastic anisotropy is unaffected. Chemochromism from transparent white (MoO₃ and Fe-MoO₃) to near black (Ni-MoO₃) to brilliant dark blue (Ge-MoO₃) is demonstrated and is associated with a reduction in electronic band gap with intercalation and an increase in absorption >600 nm for some intercalants (Cr-, Ge-, and Mn-MoO₃).

中文翻译：

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插层 MoO3 中可调节的化学变色和弹性特性：Au-、Cr-、Fe-、Ge-、Mn- 和 Ni-MoO3


二维层状氧化物 α-MoO ₃ 的弹性常数的化学可调性，只需选择包括 Au、Cr、Fe 在内的金属插层剂即可实现数十 GPa 量级的可变性、Ge、Mn 和 Ni。利用纳米厚材料中受限声声子的布里渊激光散射，测量二维层状插层 MoO ₃ 的量化声子分支的面内角色散，并用于确定体积模量（ K)、杨氏模量 (E ₁₁ 、 E ₂₂ 和 E ₃₃ )、九个独立弹性张量单元中的每一个 (c _ij 中的各向异性，但 Ge-MoO ₃ 中除外，其面内纵向弹性各向异性不受影响。化学变色从透明白色（MoO ₃ 和 Fe-MoO ₃ ）到近黑色（Ni-MoO ₃ ）到亮深蓝色（Ge-MoO ）已被证明，并且与插层时电子带隙的减小以及某些插层剂（Cr-、Ge-和 Mn-MoO ₃ ）吸收 >600 nm 的增加有关。