Strongly Coupled Tin(IV) Sulfide–MultiWalled\nCarbon Nanotube Hybrid Composites and Their Enhanced Thermoelectric\nProperties

Abstract

Herein, tin­(IV) sulfide (SnS₂) and multiwalled carbon\nnanotube (MWCNT) composites are fabricated via a simple solution-mixing\nmethod in a hydrothermal reactor. SnS₂ is closely coupled\nto the MWCNT surface, thus forming a coaxial nanostructure. Examination\nby X-ray photoelectron spectroscopy and scanning transmission electron\nmicroscopy indicates that the strong interface between SnS₂ and the MWCNTs in the composite material is due to the formation\nof Sn–O and Sn–S bonds. In addition, an examination\nof the temperature-dependent thermoelectric (TE) properties demonstrates\nthat the SnS₂–MWCNT hybrid composite with 3 wt %\nMWCNTs exhibits the maximum power factor of ∼91.34 μW/(m·K²) at 500 K, which is ∼50 times larger than that of\nthe pristine SnS₂. These results highlight the fabrication\nand enhanced TE properties of hybrid composites via the coupling of\nSnS₂ and MWCNTs.