Abstract
We report a novel hot-injection route to synthesize meso/macroporous β-In2S3 ultrathin nanosheets (UTNSs) with about 1.2 nm in thickness and a few micrometers in lateral dimensions using oleic acid (OA) as capping agent and liquid paraffin (LP) as reductive solvent. A reasonable formation mechanism involving redox reaction and oriented-growth was proposed: sulphur powder is reduced to S2− in LP by dehydrogenation process, and then reacts with In3+ to form In2S3 UTNSs under the inductive agent of OA and chloride ion. The large band gap (∼2.34 eV) and obvious blue-shifted absorption edge in the UV-Vis diffuse reflectance spectrum indicate a strong quantum confinement effect resulted from ultra-thinness structure. This low-cost and environment-friendly synthesis strategy provides an extended route to synthesize chalcogenide nanomaterials with ultrathin sheet-structure.
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