Hydrothermal

Introduction

Compared to hydro-thermal method, hydrothermal method is a way to produce MoS2 under atmospheric pressure, the temperature does not exceed 100 ℃ and through liquid-phase reaction. The temperature of hydro-thermal method is between 100 ~ 240 ℃. Production made by this way can be precipitate or MoS3, then decomposed by heating or the use of hydrogenation to produce molybdenum disulfide.

Material

1. At normal temperature and pressure, use (NH4) 2MoS4, badjusting the pH value of the solution by ammonia or hydrochloric acid which is controlled at between 7 to 10. Too low pH will produce MoS3 precipitation, and if too high, MoO2 impurity will be introduced. MoS2 produced by this method can be used to makeing high active catalyst.

2.Adopting (NH4) 2MoS4 as raw materials, water and acetone mixture can be added electrolyte and it can produce foamy or tubulous MoSx deposit, then process it to obtain molybdenum disulfide. Added electrolyte will have a great impact on the morphology of the product. When the concentration is more than 1%, surface of a precipitate would not be smooth, and there are a lot of holes with different dimensions. When the concentration increases, the size of the ball will become uniform sizes.

3.If use (NH4) 6Mo7O24 • 4H2O and Na2S12 • 9H2O as a raw material, the pH is adjusted by hydrochloric acid, at a constant temperature of 90 ℃ for a period of time, it can produce molybdenum disulfide. The average diameter of MoS2 is 20 ~ 40nm, a length is between 50 ~ 150nm.

Reaction temperatures of hydrothermal method is Low, the condition is relatively simple, which is suitable for mass production. But there are some problems, the products prepared by this method are mostly amorphous state MoSx, rather than direct MoS2.