Scanning Tunneling Microscopy of Galena (100) Surface Oxidation and Sorption of Aqueous Gold
- 15 November 1991
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 254 (5034), 983-986
- https://doi.org/10.1126/science.254.5034.983
Abstract
Scanning tunneling microscopy was used to characterize the growth of oxidized areas on galena (100) surfaces and the formation of gold islands by the reductive adsorption of AuCl4– from aqueous solution. The gold islands and galena substrate were distinguished by atomic resolution imaging and tunneling spectroscopy. Oxidized areas on galena have [110]-trending boundaries; gold islands elongate along [110] directions. However, there are no obvious structural registry considerations that would lead to elongation of gold islands in a [110] direction. Instead, it is probable that a direct coupling of gold reduction and sulfide surface oxidation controls the initial formation of gold islands. Gold islands grow less quickly on preoxidized galena surfaces and show no preferred direction of growth.Keywords
This publication has 12 references indexed in Scilit:
- Atomic-Resolution Electrochemistry with the Atomic Force Microscope: Copper Deposition on GoldScience, 1991
- Atomic structure of Cu adlayers on Au(100) and Au(111) electrodes observed byin situscanning tunneling microscopyPhysical Review Letters, 1990
- STM investigation of galena surfaces in airSurface Science, 1990
- Scanning tunneling microscopy of sulfide surfacesGeochimica et Cosmochimica Acta, 1990
- High-temperature hydrothermal precipitation of precious metals on the surface of pyriteNature, 1989
- An XPS study of gold deposition at low temperatures on sulphide minerals: Reducing agentsGeochimica et Cosmochimica Acta, 1989
- Atomically resolved scanning tunneling microscopy images of dislocationsPhysical Review B, 1988
- Scanning tunneling microscopy of an ion-bombarded PbS(001) surfaceApplied Physics Letters, 1988
- An XPS and SEM study of gold deposition at low temperatures on sulphide mineral surfaces: Concentration of gold by adsorption/reductionGeochimica et Cosmochimica Acta, 1985
- An x-ray photoelectron spectroscopic study of the oxidation of galenaApplications of Surface Science, 1984