Liquid-phase controlled synthesis of Sb-derived heterostructures.

Sb-derived heterostructures, including Sb 2 O 3 /SnO 2 heterostructure and Sb 2 S 3 /SnS 2 heterostructure, were prepared by a one-step hydrothermal method using exfoliated Sb nanoflakes as Sb source. The as-synthesized Sb 2 S 3 /SnS 2 heterostructure photocatalyst exhibited excellent photocatalytic activity. [Display omitted] • Sb nanoflakes were used to prepare Sb 2 O 3 /SnO 2 and Sb 2 S 3 /SnS 2 heterostructures. • The slow release of Sb3+ ions from Sb nanoflakes led to uniform heterostructures. • Sb 2 S 3 and SnS 2 formed the type-II heterojunction. • The Sb 2 S 3 /SnS 2 heterostructures exhibited superior photocatalytic activity. Antimony (Sb) based compounds such as Sb 2 O 3 and Sb 2 S 3 have shown promises in electronics, catalysis and sensing devices. Their functional performances can be further improved by integration with other materials to from composites or heterostructures, which however, usually require tedious procedures with poor morphology control. Herein, we realized direct hydrothermal synthesis of Sb 2 O 3 /SnO 2 heterostructures and Sb 2 S 3 /SnS 2 heterostructures by using liquid-phase exfoliated two-dimensional (2D) Sb nanoflakes as precursors. Compared to directly using SbCl 3 salt as the reactant, using the Sb nanoflakes enabled the slow release of Sb3+ ions which benefited the better controlled nucleation and growth of Sb 2 O 3 (or Sb 2 S 3) acting as growth templates for the further deposition of SnO 2 (or SnS 2). As a demonstration, the as-prepared Sb 2 S 3 /SnS 2 heterostructures were employed for photocatalytic methylene blue (MB) degradation, which exhibited a faster degradation rate compared to Sb 2 S 3 or SnS 2 alone. Our work offers an alternative strategy with elemental 2D materials as precursors for the preparation of heterostructured functional materials. [ABSTRACT FROM AUTHOR]