We report a facile approach to prepare carbon-coated troilite FeS (C@FeS) nanosheets
via surfac
tant-assisted solution-based synthesis. 1-Dodecanethiol is used as both the sulfur source and the surfac
tant, which may form different-shaped micelles to direct the growth of nanostructures. Under appropriate growth conditions, the iron and sulfur atoms react to form thin layers of FeS while the hydrocarbon tails of 1-dodecanethiol separate the thin FeS layers, which turn to carbon after annealing in Ar. Such an approach can be extended to grow C@FeS nanospheres and nanoplates by modifying the synthesis parameters. The C@FeS nanosheets display excellent Li storage properties with high specific capacities and stable charge/discharge cyclability, especially at fast charge/discharge rates.
Keywords:
soft-template; 2D nanostructures; metal sulfides; iron; lithium ion battery