This study investigated the dispersion stability of exfoliated MoS₂ nanoflakes in various organic solvents and binary mixtures using a Turbiscan optical analyzer. Sedimentation behavior was quantitatively evaluated via transmittance variation (ΔT), backscattering variation (ΔBS), and the Turbiscan stability index (TSI). Alcohol-based solvents were categorized by hydrophilic-lipophilic balance values. Long-chain alcohols, such as 1-undecanol, showed increased stability due to high viscosity and strong hydrophobic affinity with MoS2 basal planes, while short-chain alcohols exhibited poor stabilization. Binary mixtures of isopropanol (IPA) and tetrahydrofuran (THF) were also assessed, with the 5:5 volume ratio showing the best stability profile, including the lowest TSI and minimal ΔT and ΔBS values. This improvement is attributed to synergistic interactions, as IPA stabilizes hydrophilic edge sites, while THF engages with hydrophobic basal surfaces. These findings highlight the importance of balancing physicochemical properties when selecting solvents to improve MoS2 dispersion for structural modification and electrocatalytic applications.

1. Introduction 
2. Experimental Section 
    2.1. Preparation of Exfoliated MoS2 Materials 
    2.2. Materials and Characterizations 
3. Results and Discussion 
    3.1. Dispersion Stability Analysis Based on Turbiscan 
    3.2. Dispersion Stability of MoS2 Assessed by TSI 
    3.3. Time- and Height-Resolved Turbiscan Analysis of MoS2 Dispersion Stability 
4. Conclusion 
Funding
Conflict of Interest 
Data Availability Statement 
Author Information and Contribution 
Acknowledgments
References

• Ammad Ali(Korea National Institute of Rare Metals, Korea Institute of Industrial Technology, Incheon 21655, Republic of Korea)
• Kee-Ryung Park(Korea National Institute of Rare Metals, Korea Institute of Industrial Technology, Incheon 21655, Republic of Korea)
• Mi Hye Lee(Korea National Institute of Rare Metals, Korea Institute of Industrial Technology, Incheon 21655, Republic of Korea)
• Da-Woon Jeong(Korea National Institute of Rare Metals, Korea Institute of Industrial Technology, Incheon 21655, Republic of Korea)
• Bum Sung Kim(Korea National Institute of Rare Metals, Korea Institute of Industrial Technology, Incheon 21655, Republic of Korea)
• Leeseung Kang(Korea National Institute of Rare Metals, Korea Institute of Industrial Technology, Incheon 21655, Republic of Korea) Corresponding author
• Yoseb Song(Korea National Institute of Rare Metals, Korea Institute of Industrial Technology, Incheon 21655, Republic of Korea) Corresponding author
• Jae Min Sung(Korea National Institute of Rare Metals, Korea Institute of Industrial Technology, Incheon 21655, Republic of Korea, The Department of Materials Science and Engineering, Inha University, Incheon 22212, Republic of Korea)
• Dong-Won Kyung(Korea National Institute of Rare Metals, Korea Institute of Industrial Technology, Incheon 21655, Republic of Korea, The Department of Materials Science and Engineering, Inha University, Incheon 22212, Republic of Korea)
• Haejin Hwang(The Department of Materials Science and Engineering, Inha University, Incheon 22212, Republic of Korea)