Molybdenum Disulfide Nanoribbons with Enhanced Edge Nonlinear Response and Photoresponsivity

MoS₂ nanoribbons have attracted increased interest due to their properties, which can be tailored by tuning their dimensions. Herein, the growth of MoS₂ nanoribbons and triangular crystals formed by the reaction between films of MoOx (22 nanoribbons arising from distinct contributions from the single-layer edges and multilayer core. Nanoscale imaging reveals a blue-shifted exciton emission of the monolayer edge compared to the isolated MoS₂ monolayers due to built-in local strain and disorder. We further report on an ultrasensitive photodetector made of a single MoS₂ nanoribbon with a responsivity of 8.72 × 10²  A W^-1 at 532 nm, among the highest reported up-to-date for single-nanoribbon photodetectors. These findings can inspire the design of MoS₂ semiconductors with tunable geometries for efficient optoelectronic devices.