Chemical Welding on Semimetallic TiS Nanosheets for High-Performance Flexible n-Type Thermoelectric Films.

Solution-based processing of two-dimensional (2D) materials provides the possibility of allowing these materials to be incorporated into large-area thin films, which can translate the interesting fundamental properties of 2D materials into available devices. Here, we report for the first time a novel chemical-welding method to achieve high-performance flexible n-type thermoelectric films using 2D semimetallic TiS nanosheets. We employ chemically exfoliated TiS nanosheets bridged with multivalent cationic metal Al to cross-link the nearby sheets during the film deposition process.