Tribological properties of ultrananocrystalline diamond and diamond nanorod films

► Tribology of ultra nanocrystalline diamond and diamond nanorod films. ► Diamond nanorod is hydrophobic while ultra nanocrystalline film is hydrophilic in nature. ► High to low friction coefficient is observed while changing the test atmospheres. ► sp3/sp2, nanocrystalline graphite and carbonitrile phase influence the friction coefficient.