<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>The title nanostructures are hydrothermally prepared by dropwise addition of CS<sub>2</sub> into a mixture of aqueous polyvinylpyrrolidone, CuSO<sub>4</sub>, NaOH, and ascorbic acid (autoclave, 120 °C, 12 h).</p> </abstract>