Intrinsic Chirality and Optical Anisotropy in Single MoS ₂ Nanoscroll: Implications for Wavelength-Selective Dichroic Materials

Engineering chirality in transition-metal dichalcogenides (TMDs) materials, such as MoS2, has attracted significant attention due to their promising applications in advanced optics, electronics, and spintronics. In this study, the single one-dimensional (1D) chiral MoS2 nanoscroll was formed by rolling up a two-dimensional (2D) monolayer MoS2 nanosheet after dropping ethanol–water solutions. As a 1D material, the MoS2 nanoscroll shows anisotropy and chirality dependency using atomic force microscopy (AFM), angle-resolved polarized Raman spectroscopy (ARPRS), scanning polarized modulation microscopy (SPMM), and scanning circular dichroism microscopy (SCDM). Intrinsic circular dichroism (CD) and linear dichroism (LD) of the single MoS2 nanoscroll both exhibit a strong dependence on excitation wavelengths (473, 633, and 671 nm), reaching maximum value (CD = 32.8 mdeg and LD = 0.20) at 671 nm near the A-exciton resonance. These findings highlight single nanoscrolls as a promising platform for chiral optoelectronics and motivate future exploration toward photodetectors and spin filters.