Metal chalcogenide nanorings for temperature-strain dual-mode sensing.

Most metal chalcogenides exhibit layered structures and anisotropic morphologies such as nanosheets, nanoplates, and nanotubes, as well as nanosheet-assembled nanoflowers. Unconventional morphologies such as nanorings may bring appealing properties to functional materials, but they have not been realized with metal chalcogenides. Herein, we report that Sn 0.2 Mo 0.8 S 2 nanorings with a mixed 1T/2H phase were synthesized by etching SnS 2 cores from Sn 1- x Mo x S 2 /SnS 2 lateral heterostructures. Flexible electronic sensors based on these Sn 0.2 Mo 0.8 S 2 nanorings exhibited excellent temperature and strain sensing performance, with a negative temperature coefficient of resistance of -0.013 °C -1 and a minimum detectable strain of 0.09%. In addition, the dual-functional flexible electronic sensors with easy fabrication and good wearability showed great promise for tracking human activities and monitoring inapparent health-related signals.