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Graphene-like two-dimensional layered materials have attracted quite a lot of interest because of their sizable band gaps and potential applications. In this work, monodisperse tin disulfide (SnS₂) nanosheets were successfully prepared by a simple solvothermal procedure in the presence of polyvinylpyrrolidone (PVP). Large PVP molecules absorbing on (001) facets of SnS₂ would inhibit crystal growth along [001] orientation and protect the product from agglomeration. The obtained SnS₂ nanosheets have diameters of ca. 0.8–1 μm and thicknesses of ca. 22 nm. Different experiment parameters were carried out to investigate the transformation of phase and morphology. The formation mechanism was proposed according to the time-dependent experiments. SnS₂ nanosheets exhibit high photocatalytic H₂ evolution activity of 1.06 mmol h^–1 g^–1 under simulated sunlight irradiation, much higher than that of SnS₂ …