Journal
APPLIED SURFACE SCIENCE
Volume 575, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2021.151675
Keywords
Graphite; Oxygen plasma; Raman spectroscopy; TPD; XPS
Categories
Funding
- Spanish MEC [CTQ2005-09105-C04-02-]
- Spanish MICINN [EUI2008-00185]
- CSIC-PIE [201880E048]
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This study investigates the effect of low-pressure microwave discharge oxygen plasma treatment on two types of high-surface area graphite. The results show that longer plasma treatment leads to an increase in graphitic order and the formation of surface-functionalized materials without compromising their thermal stability and aromatic network. Additionally, the longer plasma exposure contributes to the development of an edge surface-functionalized graphite. Mechanical damage sub-surface caused by the milling process was also observed in one of the materials.
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 N-2 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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