Abstract
The adsorption of phenol, 2-naphthol and catechol on well-defined Cu(1 1 1) surface has been investigated by using in situ scanning tunneling microscopy (STM) and electrochemical method in aqueous HClO 4 solution. All the molecules were found to form highly ordered adlayers. High-resolution STM images revealed the molecular orientation and packing arrangement in the ordered adlayers. The STM images of phenol and catechol molecules appeared as characteristic triangular shapes in (3×3) structure as that of benzene molecules. But the STM image of 2-naphthol molecules in a (3×4) structure was slightly different from that of naphthalene and derivatives reported previously. Such difference can be attributed to the introduction of hydroxyl group at the C 2-position. Three structural models are also proposed for the three adlayers.
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