Adsorption behaviors of V ₂ O ₅ nanowires on binary mixed self-assembled monolayers

The adsorption behaviors of V ₂ O ₅ 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 V ₂ O ₅ nanowires showed a preferential adsorption on amine (NH ₂ )-terminated thiolates over methyl (CH ₃ )-terminated ones. However, on the binary mixed SAM of NH ₂ - and CH ₃ -terminated thiols, the adsorption behavior did not follow a simple expectation based upon the electrostatic interaction. The total number of adsorbed V ₂ O ₅ nanowires increased with the mole fraction of NH ₂ -terminated thiolates up to χ _{N 2} ∼ 0.5, then it decreased with further increase of χ _{N H2} . 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 H2} ∼ 0.75 and then it decreased with further increase of χ _{N H2} . The dispersion of molecules with polar-functional groups as well as the molecular ordering of mixed SAMs is attributed to such adsorption behaviors of V ₂ O ₅ nanowires.