A Simple Laboratory Method for Identifying the Authenticity of Molybdenum Disulfide
2025-10-10
Recently, we have received feedback from customers reporting that they have purchased Molybdenum disulfide products in the market, which are suspected to be counterfeit. Upon actual use, these products failed to deliver the expected lubrication performance. To assist our customers in resolving this issue, we are pleased to provide a straightforward laboratory-based identification method.
Experimental Methodology
Material Preparation
● Sample to be tested (suspected not to be Molybdenum disulfide, labeled "Non-Molybdenum disulfide")
● High-purity molybdenum disulfide reference sample (labeled "Molybdenum Disulfide")
● Several crucibles
● Muffle furnace
Figure 1: Original Packaging of Molybdenum Disulfide and Non-Molybdenum Disulfide
Figure 2: Crucible Sampling—Not Molybdenum Disulfide and Molybdenum Disulfide (both appear as black powders).
Operating Procedures
1. Take 2-3 grams of the sample to be tested and 2-3 grams of high-purity molybdenum disulfide, respectively, and place them into separate crucibles.
2. Use crucible tongs to place the crucible into the muffle furnace.
3. Set the temperature to 500–600°C and calcine for 30–40 minutes.
4. Take out the sample, observe, and compare the appearance changes before and after calcination.
Figure 3: Transfer of Non-Molybdenum Disulfide Crucibles into the Muffle Furnace
Figure 4: Transfer of the molybdenum disulfide crucible into the muffle furnace
Figure 5: Calcination in a muffle furnace
Result Determination
Genuine Molybdenum Disulfide After roasting, the appearance color undergoes a noticeable change, shifting from black to pale green.
Counterfeit Molybdenum Disulfide No significant changes in appearance before and after calcination.
Figure 6: Comparison of Non-Molybdenum Disulfide and Molybdenum Disulfide Before and After Calcination
Principle Analysis
Molybdenum disulfide (MoS₂) 2 ) It begins to oxidize when heated in air to 315°C, and the oxidation reaction accelerates as the temperature rises, forming pale green molybdenum trioxide (MoO₃). 3 ), while simultaneously releasing sulfur dioxide gas. The chemical reaction is as follows:
2MoS2 + 70 2 → 2MoO 3 + 4SO 2
Common counterfeit products on the market primarily consist of graphite, which exhibits stable properties under experimental conditions and does not undergo oxidation reactions, thus maintaining its original color appearance.
Precautions
1. This method is applicable only for qualitative identification and cannot determine the specific content of molybdenum disulfide in the sample.
2. For quantitative analysis of molybdenum disulfide content, more precise chemical testing methods must be employed.
3. Please ensure proper ventilation during the experiment to avoid inhaling the generated gases.
This method provides a rapid and convenient approach for authenticity verification, and we hope it can serve as a valuable reference for colleagues in the industry. If you have any technical questions or require further technical support, please feel free to contact us for discussion and collaboration.
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