Metal chalcogenide nanorings for temperature-strain dual-mode sensing

Area of Science:

• Materials Science
• Nanotechnology
• Solid State Chemistry

Background:

• Metal chalcogenides typically form layered structures and anisotropic morphologies.
• Unconventional nanostructures like nanorings offer potential for novel material properties.
• The synthesis of metal chalcogenide nanorings has not been previously reported.

Purpose of the Study:

• To synthesize metal chalcogenide nanorings.
• To investigate the properties of these nanorings for electronic sensing applications.
• To explore the potential of nanoring-based sensors for monitoring human activity and health signals.

Main Methods:

• Synthesis of Sn$_{1-x}$Mo$_{x}$S$_{2}$/SnS$_{2}$ lateral heterostructures.
• Etching of SnS$_{2}$ cores to form Sn$_{0.2}$Mo$_{0.8}$S$_{2}$ nanorings with a mixed 1T/2H phase.
• Fabrication and testing of flexible electronic sensors using the synthesized nanorings.

Main Results:

• Successful synthesis of Sn$_{0.2}$Mo$_{0.8}$S$_{2}$ nanorings with a mixed 1T/2H phase.
• Flexible sensors demonstrated excellent temperature sensing with a negative temperature coefficient of resistance of -0.013 °C$^{-1}$.
• Sensors exhibited high strain sensitivity with a minimum detectable strain of 0.09%.

Conclusions:

• Sn$_{0.2}$Mo$_{0.8}$S$_{2}$ nanorings are a novel material for advanced electronic sensors.
• The developed dual-functional sensors offer easy fabrication and good wearability.
• These sensors show significant promise for tracking human activities and monitoring subtle physiological signals.