Adsorption of Gold and Silver on the Tungsten (110) Surface Studied by Field Emission Microscopy

✍ Scribed by J.P. Jones

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 416 KB
• Volume: 104
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1993.1148

✦ Synopsis

The field emission characteristics of the tungsten (110) surface before and after diffusive invasion by vapor deposited gold and silver have been investigated using probe-hole microscopy. Adatoms adsorbed on the terraces which surround W(110) extend the plane area producing an apparent increase in work function before invasion takes place. At temperatures above (500 \mathrm{~K}), the terraced regions are rearranged by adsorbed gold but not by silver. Once populated the plane is rapidly covered with a complete monolayer of the metal, and invasion by gold is consistent with a mechanism of nucleation and 2-dimensional growth. Both the work functions of the monolayers and the coverages at which they form are in substantial agreement with findings on macroscopic W(110) using LEED and related techniques. 1993 Academic Press, Inc.