Adsorption behaviors of V2O5 nanowires on binary mixed self-assembled monolayers

Abstract The adsorption behaviors of V2O5 nanowires on binary mixed self-assembled monolayers (SAMs) were investigated with variation of the mixing ratio of two differently terminated thiolates on Au. Hydroxyl-covered V2O5 nanowires showed a preferential adsorption on amine (NH2)-terminated thiolates over methyl (CH3)-terminated ones. However, on the binary mixed SAM of NH2- and CH3-terminated thiols, the adsorption behavior did not follow a simple expectation based upon the electrostatic interaction. The total number of adsorbed V2O5 nanowires increased with the mole fraction of NH2-terminated thiolates up to χ N H 2 ∼ 0.5 , then it decreased with further increase of χ N H 2 . The height distribution of adsorbed nanowires showed that the relative portion of the agglomerated wires thicker than 3.5 nm to individual wires thinner than 3.5 nm increased up to χ N H 2 ∼ 0.75 and then it decreased with further increase of χ N H 2 . The dispersion of molecules with polar-functional groups as well as the molecular ordering of mixed SAMs is attributed to such adsorption behaviors of V2O5 nanowires.