The Correlation Between Molecular Structure and Tribological Properties of Graphene Oxide with Different Oxidation Degree

• Published in: Tribology letters Vol. 67; no. 3; pp. 1 - 19
• Main Authors: Zhao, Lei, Yang, Hongmei, Liu, Chang, Xue, Shaoqing, Deng, Zhao, Li, Jiusheng, Zeng, Xiangqiong
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.09.2019; Springer Nature B.V
• Subjects: Chemical synthesis; Chemistry and Materials Science; Coefficient of friction; Corrosion and Coatings; Friction reduction; Graphene; Lubrication; Materials Science; Molecular structure; Nanotechnology; Original Paper; Oxidation; Physical Chemistry; Potassium permanganate; Reaction time; Structural analysis; Sulfuric acid; Surfaces and Interfaces; Theoretical and Applied Mechanics; Thin Films; Tribology; Wear mechanisms; Wear rate; Tribological properties; Graphene oxide; Oxidation degree
• ISSN: 1023-8883; 1573-2711
• DOI: 10.1007/s11249-019-1199-y

Eight kinds of GOs with different oxidation degree were synthesized. Molecular structure characterization indicated that with more usage of H 2 SO 4 , less usage of KMnO 4 , and more reaction time at high temperatures (95 °C), the oxidation degree of GO decreased. Tribological tests showed that GO water suspensions could reduce the friction coefficient of water by 33–46% as well as decrease the wear rate of water by 36–64%. Lubrication mechanism verified the formation of GO tribofilms on the sliding surface. GO with higher oxidation degree had a better adsorption capacity and the optimum concentration was 0.15 mg/ml. Moreover, some oxygen-containing groups of GO were decomposed to form a graphene-like structure, which would increase the tribological property of GO suspensions.