期刊
LANGMUIR
卷 38, 期 3, 页码 1252-1258出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.1c03062
关键词
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资金
- Rice University
- Advanced Research Projects Agency-Energy (ARPA-E), U.S. Department of Energy [DE-AR0000ABC]
- National Science Foundation [DMR-1419807]
This study investigated the time-dependent surface composition of gold samples with different initial levels of contamination under ultra-high vacuum (UHV) conditions. The results show that the concentration of surface hydrocarbons under UHV can be explained by molecular adsorption-desorption competition theory. The study provides insights into the temporal evolution of surface contamination under UHV and suggests methods to mitigate its effects.
Ultra-high vacuum (UHV) is essential to many surface characterization techniques and is often applied with the intention of reducing exposure to airborne contaminants. Surface contamination under UHV is not well-understood, however, and introduces uncertainty in surface elemental characterization or hinders surface-sensitive manufacturing approaches. In this work, we investigated the time-dependent surface composition of gold samples with different initial levels of contamination under UHV over a period of 24 h with both experiments and physical modeling. Our results show that surface hydrocarbon concentration under UHV can be explained by molecular adsorption-desorption competition theory. Gold surfaces that were initially pristine adsorbed hydrocarbons over time under UHV; conversely, surfaces that were initially heavily contaminated desorbed hydrocarbons over time. During both adsorption and desorption, the concentration of contaminants tended toward the same equilibrium value. This study provides a comprehensive evaluation of the temporal evolution of surface contamination under UHV and highlights routes to mitigate surface contamination effects.
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