Abstract

MoS₂ nanoribbons have attracted increased interest due to their properties which can be tailored by tuning their dimensions. Herein, we demonstrate the growth of quasi-one-dimensional (1D) MoS₂ nanoribbons and 3D triangular crystals formed by the reaction between ultra-thin films of MoO₃ grown by pulsed laser deposition and NaF in a sulfur-rich environment. The nanoribbons can reach up to 10 µm in length, and feature single-layer edges, thereby forming a single-multilayer homojunction. The single-layer edges of the nanoribbons show a pronounced second harmonic generation due to symmetry breaking, in contrast to the centrosymmetric multilayer structure. A pronounced splitting of the Raman spectra was observed in quasi-1D MoS₂ nanoribbons arising from distinct contributions from the monolayer edges and multilayer core. Nanoscale imaging reveals a blue-shifted exciton emission of the monolayer edge compared to the individual triangular MoS₂ monolayers due to built-in local strain and disorder. We further report on an ultrasensitive photodetector made of a single quasi-1D MoS₂ nanoribbon with a responsivity of 8.72×10² A/W.

Abstract

MoS₂ nanoribbons have attracted increased interest due to their properties which can be tailored by tuning their dimensions. Herein, we demonstrate the growth of quasi-one-dimensional (1D) MoS₂ nanoribbons and 3D triangular crystals formed by the reaction between ultra-thin films of MoO₃ grown by pulsed laser deposition and NaF in a sulfur-rich environment. The nanoribbons can reach up to 10 µm in length, and feature single-layer edges, thereby forming a single-multilayer homojunction. The single-layer edges of the nanoribbons show a pronounced second harmonic generation due to symmetry breaking, in contrast to the centrosymmetric multilayer structure. A pronounced splitting of the Raman spectra was observed in quasi-1D MoS₂ nanoribbons arising from distinct contributions from the monolayer edges and multilayer core. Nanoscale imaging reveals a blue-shifted exciton emission of the monolayer edge compared to the individual triangular MoS₂ monolayers due to built-in local strain and disorder. We further report on an ultrasensitive photodetector made of a single quasi-1D MoS₂ nanoribbon with a responsivity of 8.72×10² A/W.

Abstract

MoS₂ nanoribbons have attracted increased interest due to their properties which can be tailored by tuning their dimensions. Herein, we demonstrate the growth of quasi-one-dimensional (1D) MoS₂ nanoribbons and 3D triangular crystals formed by the reaction between ultra-thin films of MoO₃ grown by pulsed laser deposition and NaF in a sulfur-rich environment. The nanoribbons can reach up to 10 µm in length, and feature single-layer edges, thereby forming a single-multilayer homojunction. The single-layer edges of the nanoribbons show a pronounced second harmonic generation due to symmetry breaking, in contrast to the centrosymmetric multilayer structure. A pronounced splitting of the Raman spectra was observed in quasi-1D MoS₂ nanoribbons arising from distinct contributions from the monolayer edges and multilayer core. Nanoscale imaging reveals a blue-shifted exciton emission of the monolayer edge compared to the individual triangular MoS₂ monolayers due to built-in local strain and disorder. We further report on an ultrasensitive photodetector made of a single quasi-1D MoS₂ nanoribbon with a responsivity of 8.72×10² A/W.

Abstract

MoS₂ nanoribbons have attracted increased interest due to their properties which can be tailored by tuning their dimensions. Herein, we demonstrate the growth of quasi-one-dimensional (1D) MoS₂ nanoribbons and 3D triangular crystals formed by the reaction between ultra-thin films of MoO₃ grown by pulsed laser deposition and NaF in a sulfur-rich environment. The nanoribbons can reach up to 10 µm in length, and feature single-layer edges, thereby forming a single-multilayer homojunction. The single-layer edges of the nanoribbons show a pronounced second harmonic generation due to symmetry breaking, in contrast to the centrosymmetric multilayer structure. A pronounced splitting of the Raman spectra was observed in quasi-1D MoS₂ nanoribbons arising from distinct contributions from the monolayer edges and multilayer core. Nanoscale imaging reveals a blue-shifted exciton emission of the monolayer edge compared to the individual triangular MoS₂ monolayers due to built-in local strain and disorder. We further report on an ultrasensitive photodetector made of a single quasi-1D MoS₂ nanoribbon with a responsivity of 8.72×10² A/W.