Tunable-Diameter Nanoscrolls from Janus WSSe/WSe<sub>2</sub> Heterostructures
Masahiko Kaneda, Wenjin Zhang, Dekun Bi, Tianyishan Sun, Hiroto Ogura, Takahiko Endo, Yuta Takahashi, Shun Fujii, Toshiaki Kato, Yasumitsu Miyata
Abstract
High Resolution Image Download MS PowerPoint Slide Janus transition metal dichalcogenide (TMD) nanoscrolls have recently emerged as promising nanostructures for studying curvature- and chirality-dependent physical phenomena. However, systematic strategies to fabricate multilayer Janus TMD nanoscrolls with controlled diameters and to probe their structure-dependent optical behaviors are still lacking. Expanding on the previous finding that Janus TMD monolayers─with intrinsic asymmetry and built-in strain─spontaneously form nanoscrolls, we now demonstrate diameter-tunable nanoscrolls derived from Janus WSSe/WSe 2 heterostructures. The incorporation of a Janus monolayer facilitates the scrolling of heterostructures and enables continuous tuning of nanoscroll diameters across a broad range─from ∼10 nm to ∼1 μm. The resulting structures exhibit uniform crystallinity and composition, as confirmed by scanning transmission electron microscopy. Optical characterizations reveal anisotropic Raman responses and strain-induced modulation of second-harmonic generation (SHG). These results indicate that Janus-based nanoscrolls provide a versatile platform for investigating structure–property relationships and developing rolled TMD systems for advanced photonic and optoelectronic applications.