Temporal Evolution of Surface Contamination under Ultra-high Vacuum
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...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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American Chemical Society (ACS)
2022
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| Online Access: | https://hdl.handle.net/1721.1/142046 |
| _version_ | 1826213627398455296 |
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| author | Liu, Zhen Song, Youngsup Rajappan, Anoop Wang, Evelyn N Preston, Daniel J |
| author_facet | Liu, Zhen Song, Youngsup Rajappan, Anoop Wang, Evelyn N Preston, Daniel J |
| author_sort | Liu, Zhen |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T15:52:16Z |
| format | Article |
| id | mit-1721.1/142046 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T15:52:16Z |
| publishDate | 2022 |
| publisher | American Chemical Society (ACS) |
| record_format | dspace |
| spelling | mit-1721.1/1420462022-04-26T03:04:09Z Temporal Evolution of Surface Contamination under Ultra-high Vacuum Liu, Zhen Song, Youngsup Rajappan, Anoop Wang, Evelyn N Preston, Daniel J 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. 2022-04-25T14:49:59Z 2022-04-25T14:49:59Z 2022-01-25 2022-04-25T14:41:16Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/142046 Liu, Zhen, Song, Youngsup, Rajappan, Anoop, Wang, Evelyn N and Preston, Daniel J. 2022. "Temporal Evolution of Surface Contamination under Ultra-high Vacuum." Langmuir, 38 (3). en 10.1021/acs.langmuir.1c03062 Langmuir Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf American Chemical Society (ACS) Prof. Evelyn Wang |
| spellingShingle | Liu, Zhen Song, Youngsup Rajappan, Anoop Wang, Evelyn N Preston, Daniel J Temporal Evolution of Surface Contamination under Ultra-high Vacuum |
| title | Temporal Evolution of Surface Contamination under Ultra-high Vacuum |
| title_full | Temporal Evolution of Surface Contamination under Ultra-high Vacuum |
| title_fullStr | Temporal Evolution of Surface Contamination under Ultra-high Vacuum |
| title_full_unstemmed | Temporal Evolution of Surface Contamination under Ultra-high Vacuum |
| title_short | Temporal Evolution of Surface Contamination under Ultra-high Vacuum |
| title_sort | temporal evolution of surface contamination under ultra high vacuum |
| url | https://hdl.handle.net/1721.1/142046 |
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