Method of metallic clusters fabrication with desired size using scanning tunneling microscopy tip induced reactions

A method of transferring a single metal atom from a first location to a second location on the surface of a metal oxide, the method comprising:

• (a) obtaining a material having metal atoms deposited on the surface of a metal oxide, wherein a first metal atom is deposited on a first oxygen atom vacancy of the metal oxide;
• and
• (b) transferring the first metal atom on the first oxygen atom vacancy to a second location on the metal oxide by applying a voltage to the first metal atom,
• wherein the second location is a second metal atom on a second oxygen atom vacancy of the metal oxide, and wherein the first and second metal atoms form a first metal atom-second metal atom species, or
• wherein the second location is a metal atom of the metal oxide, and wherein the first metal atom and the metal atom of the metal oxide forms a first metal atom-metal atom of the metal oxide species.