Intrinsic Chirality and Optical Anisotropy in Single MoS₂Nanoscroll: 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.