Abstract
The work described in this paper is a study of gold adsorption on the whole tip surface of iridium field emitter. The study has been carried out using field emission microscope. Changes in electron work function of the iridium substrate which are produced by vapor of deposition of submonolayers of gold in ultra high vacuum have been measured by noting the changes in the slope of Fowler-Nordheim plots. The same procedure for studying the adsorption of copper on iridium [1] was followed to study the adsorption of gold on iridium. Adsorption of gold was examined on the iridium surface containing the (100) ring which could not be removed thermally.
Highlights
The field emission microscope was invented by Muller in 1937 [2]
Changes in electron work function of the iridium substrate which are produced by vapor of deposition of submonolayers of gold in ultra high vacuum have been measured by noting the changes in the slope of Fowler-Nordheim plots
Variation of Electron Work Function (Φ) with Gold Coverage (θ) (Φ-θ) curves have been obtained at two spreading temperatures 500 K and 556 K
Summary
The field emission microscope (fem) was invented by Muller in 1937 [2] He was the first person to experimentally observe atoms. This device is an analytical technique used in material science to investigate molecular structures and their electronic properties [3]. One of the most important applications of field emission microscope is the study of adsorption on metallic cathode surface. Simple field emission microscopy was used previously to study the adsorption of group 1b elements (copper, silver, and gold) on tungsten which has a body-centred cubic (bcc) structure and rhenium which has hexagonal close-packed (hcp) structure [7] [8], so in this study we have used iridium as a substrate because it has the fcc structure which is isomorphous with that of the bulk adsorbate
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