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The two-dimensional Ti 3 C 2 (OH) 2 nanosheets were synthesized by exfoliation of laminated Ti 3 AlC 2 in HF and characterized by X-ray diffractometry, SEM, TEM, and HRTEM. The results indicated that the Ti 3 C 2 (OH) 2 compounds had 2D layer-like structures with a thickness of 10-20 nm, and the fabrication process of Ti 3 C 2 (OH) 2 nanosheets was discussed on the basis of the experimental facts. The tribological properties of Ti 3 C 2 (OH) 2 nanosheets as additives in base oil were investigated using a UMT-2 ball-ondisc tribotester. Under the determinate conditions, the friction coefficient of the base oil containing Ti 3 C 2 (OH) 2 nanosheets was lower than that of the base oil under 15 N load with 200 rpm, and decreased with increasing mass fraction of Ti 3 C 2 (OH) 2 nanosheets when it was <1.0 wt%. A combination of sliding friction, and stable tribofilm on the rubbing surface could explain the improved tribological properties of Ti 3 C 2 (OH) 2 nanosheets as additives.

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