Nontoxic and earth abundant nanostructured semiconductors have experienced wide attention of researchers recently. One of the more studied material is Iron pyrite (FeS2) owing many different promising applications. Herein, the synthesis of nanostructures by varying the reactant precursors of iron and sulphur has been reported. The molar ratio of iron and sulphur precursors play a crucial role in determining the quality of nanostructures. This work further advances synthesis with pyrite purity, structure control and then promotes use in photovoltaics, photocatalysis and photoelectrochemistry applications. Copyright © 2017 VBRI Press.