The Proximity Effect on Semiconducting Mineral Surfaces: A new aspect of Mineral Surface Reactivity and Surface Complexation Theory?

Journal Article · Sun Jul 01 00:00:00 EDT 2001 · Geochimica et Cosmochimica Acta

DOI:https://doi.org/10.1016/S0016-7037(01)00624-X· OSTI ID:1012321

Becker, Udo; Rosso, Kevin M.; Hochella, Michael F.

The observation and description of surface proximity effects, whereby the chemical reaction of one surface site influences the electronic structure and reactivity of neighboring or nearby sites, is presented in this study for semiconducting minerals pyrite (FeS2) and galena (PbS) using ab initio molecular orbital calculations as well as scanning tunneling microscopy and spectroscopy. Surface complexation theory, an important model for attachment/detachment reactions at mineral-water interfaces, will eventually need to be modified to include the influence of proximity effects.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1012321
• Report Number(s): PNNL-SA-32461; KC0303020
• Journal Information: Geochimica et Cosmochimica Acta, Vol. 65, Issue 16; ISSN 0016-7037
• Country of Publication: United States
• Language: English