A SIMPLE AND SPECIFIC METHOD OF ATTACHING MOLECULES TO GRAPHITE

It is shown how the surface of graphite can be treated with chromic ox ide in order to attach acid groups. It then becomes possible to attach molecules that contain basic functionalities to the graphite surface. The presence and orientation of the attached molecules are characteri zed by Auger, IR, UPS, and XPS spectroscopies. Copper tetraazaphthaloc yanine is studied in detail because a few molecules of this compound p roduce rectification of electric current in a scanning tunneling micro scope.