High-Quality Ultralong Sb2Se3 and Sb2S3 Nanoribbons on a Large Scale via a Simple Chemical Route

Abstract

Large-scale ultralong single-crystalline Sb₂Se₃ and Sb₂S₃ nanoribbons were prepared respectively by reacting SbCl₃ with selenium and sulfur powders in glycol solution. Both Sb₂Se₃ and Sb₂S₃ nanoribbons are usually hundreds of microns in length, and the structures of the nanoribbons are determined to be of the orthorhombic phases. The Sb₂Se₃ nanoribbons are typically 100−300 nm in width and 20−60 nm in thickness and grow along the [11̄2] direction. Sb₂S₃ nanoribbons are wider than Sb₂Se₃ nanoribbons; Sb₂S₃ nanoribbons are about 200−500 nm in width and grow along the [001] direction. The growth mechanism of the nanoribbons is investigated based on high-resolution transmission electron microscopy (HRTEM) observations. Optical absorption experiment reveals that Sb₂Se₃ and Sb₂S₃ nanoribbons are two semiconductors with bandwidth E_g ≈ 1.15 eV and E_g ≈ 1.56 eV, respectively.