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The structures and relevant vibrational spectra of an ethylammonium nitrate(EAN)ionic liquid(IL)confined in TiO2 slits with various slit sizes have been investigated in detail by using classical molecular dynamics simulation.Our simulation results demonstrate that the EAN IL confined in larger TiO2 slits can form double peaks structure of CH3 group for the EA+cations,and the peaks for the NH3+group of cation and NO3-anion occur in the almost same position,near the TiO2 wall.