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The tribological behaviours of three kinds of multi-walled carbon nanotube (MWCNT) films, flattened pristine film, film with mixed acid treatment and vertically aligned film, were investigated in air at room temperature using a universal tribometer-II. The results indicated that the flattened pristine film with less defects and oxidation had the best tribological behaviour. The vertically aligned film obtained the highest friction coefficient, and vertical orientation is perhaps the most crucial factor when high friction is needed.