Molybdenum Disulfide DSC

Introduction

As a precursor, MoS3 is prepared by conventional ammonium thiosulfate precipitate. In general, MoS3 thermal decomposition have an exothermic peak at around 400℃, thereby confirming the presence of precursors. Figure 1 is a DSC curve of products obtained with various ball - milling time, when it is 400℃, exothermic peak would be weaken with the gradual of the milling time, when the milling time reaches 24h, the peak disappeared, indicating MoS3 precursor has been completely converted into molybdenum sulfide.

Ball - milling Speed play a very important role in a chemical reaction. Fig. 2 is DSC curve of products obtained with various ball - milling speeds. With the increase of the milling speed, exothermic peak gradually weaken at 400℃ and disappear when the speed reaches 400 r/min, indicating molybdenum trisulfide precursor at 400r / min speed can be completely converted to molybdenum disulfide.

The picture (a) shows that the ammonium molybdenum disulfide have two weight loss peaks at 80 ℃ and 334 ℃, there is two distinct exothermic peaks. In addition, there is a clear endothermic peak at 252℃, indicating that the phase transition occurs in this process, and ultimately become the thermodynamically stable 2H phase. However, ammonium molybdenum disulfide did not have weight loss phenomenon after annealing, which does not contain any inserts.