Adsorption of Carbon Dioxide on Mono-Layer Thick Oxidized Samarium Films on Ni(100)
Studies of adsorption of CO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula> on nanoscopic s...
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| Format: | Article |
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MDPI AG
2021-08-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/11/8/2064 |
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| author | Steinar Raaen |
| author_facet | Steinar Raaen |
| author_sort | Steinar Raaen |
| collection | DOAJ |
| description | Studies of adsorption of CO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula> on nanoscopic surfaces are relevant for technological applications in heterogeneous catalysis as well as for sorption of this important greenhouse gas. Presently, adsorption of carbon dioxide on pure and oxidized thin samarium layers near mono-layer thickness on Ni(100) has been investigated by photoelectron spectroscopy and temperature programmed desorption. It is observed that very little CO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula> adsorb on the metallic sample for exposures in the vacuum regime at room temperature. For the oxidized sample, a large enhancement in CO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula> adsorption is observed in the desorption measurements. Indications of carbonate formation on the surface were found by C 1s and O 1s XPS. After annealing of the oxidized samples to 900 K very little CO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula> was found to adsorb. Differences in desorption spectra before and after annealing of the oxidized samples are correlated with changes in XPS intensities, and with changes in sample work function which determines the energy difference between molecular orbitals and substrate Fermi level, and thus the probability of charge transfer between adsorbed molecule and substrate. |
| first_indexed | 2024-03-10T08:31:58Z |
| format | Article |
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| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T08:31:58Z |
| publishDate | 2021-08-01 |
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| series | Nanomaterials |
| spelling | doaj.art-305847cbf7e448dc8c0613c13694c4a22023-11-22T08:59:57ZengMDPI AGNanomaterials2079-49912021-08-01118206410.3390/nano11082064Adsorption of Carbon Dioxide on Mono-Layer Thick Oxidized Samarium Films on Ni(100)Steinar Raaen0Department of Physics, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, NorwayStudies of adsorption of CO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula> on nanoscopic surfaces are relevant for technological applications in heterogeneous catalysis as well as for sorption of this important greenhouse gas. Presently, adsorption of carbon dioxide on pure and oxidized thin samarium layers near mono-layer thickness on Ni(100) has been investigated by photoelectron spectroscopy and temperature programmed desorption. It is observed that very little CO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula> adsorb on the metallic sample for exposures in the vacuum regime at room temperature. For the oxidized sample, a large enhancement in CO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula> adsorption is observed in the desorption measurements. Indications of carbonate formation on the surface were found by C 1s and O 1s XPS. After annealing of the oxidized samples to 900 K very little CO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula> was found to adsorb. Differences in desorption spectra before and after annealing of the oxidized samples are correlated with changes in XPS intensities, and with changes in sample work function which determines the energy difference between molecular orbitals and substrate Fermi level, and thus the probability of charge transfer between adsorbed molecule and substrate.https://www.mdpi.com/2079-4991/11/8/2064carbon dioxidesamariumNi(100)adsorptionsurface nano-structuresTPD |
| spellingShingle | Steinar Raaen Adsorption of Carbon Dioxide on Mono-Layer Thick Oxidized Samarium Films on Ni(100) Nanomaterials carbon dioxide samarium Ni(100) adsorption surface nano-structures TPD |
| title | Adsorption of Carbon Dioxide on Mono-Layer Thick Oxidized Samarium Films on Ni(100) |
| title_full | Adsorption of Carbon Dioxide on Mono-Layer Thick Oxidized Samarium Films on Ni(100) |
| title_fullStr | Adsorption of Carbon Dioxide on Mono-Layer Thick Oxidized Samarium Films on Ni(100) |
| title_full_unstemmed | Adsorption of Carbon Dioxide on Mono-Layer Thick Oxidized Samarium Films on Ni(100) |
| title_short | Adsorption of Carbon Dioxide on Mono-Layer Thick Oxidized Samarium Films on Ni(100) |
| title_sort | adsorption of carbon dioxide on mono layer thick oxidized samarium films on ni 100 |
| topic | carbon dioxide samarium Ni(100) adsorption surface nano-structures TPD |
| url | https://www.mdpi.com/2079-4991/11/8/2064 |
| work_keys_str_mv | AT steinarraaen adsorptionofcarbondioxideonmonolayerthickoxidizedsamariumfilmsonni100 |