Bulk-layered materials were constructed into nanowall arrays, and their optical absorption properties were investigated by the finite-difference time-domain technique. The results showed that the nanowall array exhibits excellent absorption properties in both ultraviolet and visible bands. For WS2, MoS2, WSe2, MoSe2, and MoTe2, when the excitation wavelength increases to a certain value, the absorption begins to obviously decrease, and the corresponding excitation wavelength shows a redshift trend. However, the absorptivity of graphene nanowall arrays remains above 0.9 in the 350- to 1200-nm band. In addition, with similar structural parameters, the absorption properties of nanowall arrays are better than those of nanorod arrays. The change in the structural parameter and morphology can lead to an increase in the pore number, specific surface area, and multistage reflection and achieve optical absorption enhancement. Graphene nanowall arrays show excellent absorption properties by our experimental measurement.

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类石墨烯纳米壁阵列的设计及其光吸收特性

将块状层状材料构建成纳米壁阵列，并通过时域有限差分技术研究了它们的光吸收特性。结果表明，纳米壁阵列在紫外和可见波段均表现出优异的吸收性能。对于WS2、MoS2、WSe2、MoSe2和MoTe2，当激发波长增加到一定值时，吸收开始明显减小，对应的激发波长呈现红移趋势。然而，石墨烯纳米壁阵列的吸收率在 350 至 1200 纳米波段内保持在 0.9 以上。此外，在结构参数相似的情况下，纳米壁阵列的吸收性能优于纳米棒阵列。结构参数和形貌的变化可导致孔数、比表面积、和多级反射并实现光学吸收增强。通过我们的实验测量，石墨烯纳米壁阵列显示出优异的吸收特性。