Synthesis and formation process of SrSO4 sisal-like hierarchical structures at room temperature

Abstract

Strontium sulfate (SrSO₄) sisal-like hierarchical structures (SLHS) were successfully synthesized by using SrCrO₄ nanowires in mother solution as precursor to react with Na₂SO₄ aqueous solution at room temperature. The SrSO₄ SLHS have a uniform diameter of about 6 μm, which are composed of single-crystalline SrSO₄ nanopyramids oriented radially to their centre. The nanopyramids, which grow along [010] direction, are about 300–500 nm and 20–50 nm for the roots and tips in diameter and 1–3 μm in length. The controlled experimental results indicate that the formation mechanism of the SrSO₄ SLHS is related to the “two-step” growth process.