Field Emission Microscopy - Trends and Perspectives

Melmed, A.J.

doi:10.1007/978-3-642-82727-3_13

Cited by 4 publications

(2 citation statements)

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“…Diffusion of larger doses was characterized by an advancing sharp diffusion front. The first type of surface mobility of adsorbate is usually associated with sub-monolayer diffusion, the second one with the diffusion of a multilayer [15,16]. The mobility of Cu on the Ir surface was investigated because in metal/metal adsorption systems the stage of the nucleation process, that leads to the crystal growth, usually occurs in a temperature range for which the diffusion with its sharp moving front is observed [17].…”

Section: Experimenta1mentioning

confidence: 99%

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Nucleation and Crystal Growth of Cu on Ir Tips Under Ultra-High Vacuum and in the Presence of Oxygen

Zuber

Ciszewski

2000

Acta Phys. Pol. A

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Results concerning the morphology of Cu adsorption layers deposited from vapor under ultra-high vacuum on Ir tip and the influence of oxygen on this morphology are reported. The method employed was field electron emission microscopy. It was found that the presence of oxygen decreases the copper wettability of iridium. Preadsorption of oxygen on the Ir surface is followed by an increase in cohesion interaction between atoms of the Cu deposited onto the tip at room temperature. Coadsorption of Cu and O on the Ir tip surface at liquid nitrogen temperature, when followed by gradually heating the adlayer, results in crystallization of the deposit in the temperature range from 430 K to about 700 K. Some evidence indicates the formation of Cu2O with a high degree of crystallinity under these conditions. Cu and O coadsorption on the Ir surface at a temperature higher than 1090 K leads to selective accumulation of Cu on the {111} faces and to formation of epitaxial crystals which are oriented to the substrate in the same manner as the Cu crystals grown at ultrahigh vacuum from Cu flux containing no oxygen. Oxygen incorporated into the Cu beam interact preferentially with {011} and {001} Ir faces, where it can produce oxide layers.

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Section: Experimenta1mentioning

confidence: 99%

“…Field electron emission microscopy (FEM) is particularly useful for studying morphology of metal adsorption layers on metal substrates [14][15][16][17]. The use of thermally cleaned field emission tips as substrates provides surfaces with large low-index facets and terraces separated by atomic steps.…”

Section: Introductionmentioning

confidence: 99%