Surface modification of high-surface area graphites by oxygen plasma treatments
Two types of high-surface area graphite having different specific surface areas (HSAG100 and HSAG300) were treated in a low-pressure microwave discharge oxygen plasma for 3 and 10 min. The physico-chemical properties at surface scale of the resulting materials were investigated by N2 physisorption, Raman spectroscopy, temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS). For both materials, an increase of the degree of graphitic order was observed following the longer oxygen plasma exposure. Likewise, the 10-min plasma treatment gave place to surface-functionalized materials without compromising their thermal stability and aromatic network. Particularly, for HSAG100, the longer plasma exposure contributed to the development of an edge surface-functionalized graphite. In the case of as-received HSAG300, the presence of a mechanically damaged sub-surface ascribable to the milling process could be evidenced.
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | artículo biblioteca |
| Language: | English |
| Published: |
Elsevier
2021-10-30
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| Subjects: | Graphite, Oxygen plasma, Raman spectroscopy, TPD, XPS, |
| Online Access: | http://hdl.handle.net/10261/260269 https://api.elsevier.com/content/abstract/scopus_id/85119589891 |
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| Summary: | Two types of high-surface area graphite having different specific surface areas (HSAG100 and HSAG300) were treated in a low-pressure microwave discharge oxygen plasma for 3 and 10 min. The physico-chemical properties at surface scale of the resulting materials were investigated by N2 physisorption, Raman spectroscopy, temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS). For both materials, an increase of the degree of graphitic order was observed following the longer oxygen plasma exposure. Likewise, the 10-min plasma treatment gave place to surface-functionalized materials without compromising their thermal stability and aromatic network. Particularly, for HSAG100, the longer plasma exposure contributed to the development of an edge surface-functionalized graphite. In the case of as-received HSAG300, the presence of a mechanically damaged sub-surface ascribable to the milling process could be evidenced. |
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