Thermal Stability of Quasi-1D NbS3 Nanoribbons and Their Transformation to 2D NbS2: Insights from in Situ Electron Microscopy and Spectroscopy

In situ electron microscopy imaging and spectroscopy enabled us to study the evolution of quasi-1D NbS3-IV nanoribbons with respect to morphology and chemical structure at temperatures between room temperature and 1000 degrees C. Scanning transmission electron microscopy (STEM) experiments included imaging in the secondary electron, (transmitted) bright field, and high-angle annular dark-field modes while operating in the low kV regime. The results showed that NbS3-IV samples transform dramatically from smooth nanoribbons into highly textured configurations featuring polyhedral divots and steps. Similar in situ heating experiments conducted with aberration-corrected STEM revealed that bilayers of NbS3-IV chains convert topotactically into aligned 2H-NbS2 sheets upon loss of sulfur. Atomic resolution imaging, fast Fourier transform analysis, and electron energy loss spectroscopy confirmed these chemical changes, from which we propose an atomistic mechanism for the NbS3-IV -> 2H-NbS2 conversion.

Automated summary

In situ electron microscopy imaging and spectroscopy were used to study the evolution of quasi-1D NbS3-IV nanoribbons, revealing a dramatic transformation into textured configurations and aligned 2H-NbS2 sheets. Atomic resolution imaging and spectroscopy techniques confirmed the chemical changes, leading to a proposed atomistic mechanism for the conversion of NbS3-IV into 2H-NbS2.