Graphene oxide as a radiation sensitive material for XPS dosimetry

0523927 - ÚJF 2021 RIV GB eng J - Článek v odborném periodiku
Torrisi, L. - Silipigni, L. - Cutroneo, Mariapompea - Torrisi, Alfio
Graphene oxide as a radiation sensitive material for XPS dosimetry.
Vacuum. Roč. 173, č. 3 (2020), č. článku 109175. ISSN 0042-207X. E-ISSN 1879-2715.
[24th Ion Surface Interactions Conference. Moscow, 19.08.2019-23.08.2019]
Grant CEP: GA MŠMT LM2015056; GA ČR(CZ) GBP108/12/G108
Institucionální podpora: RVO:61389005
Klíčová slova: Graphene oxide * reduced graphene oxide * XPS analysis * dosimeter * soft X-ray dose
Obor OECD: Materials engineering
Impakt faktor: 3.627, rok: 2020
Způsob publikování: Omezený přístup
https://doi.org/10.1016/j.vacuum.2020.109175

The suitability of graphene oxide (GO) foils as radiation sensitive materials for soft X-ray irradiation is investigated by means of X-ray photoelectron spectroscopy (XPS). In particular GO micrometric foils have been irradiated by soft X-rays at a 1486.6 eV energy at high flux (>10(12) photons/cm(2)s) in ultra-high vacuum. The XPS analysis of the carbon-carbon (CC) and the carbon-oxygen links (CO) characterizes the composition of the first layers of the GO foils. The CC/CO ratio of the high-resolution C1s XPS spectrum is used as dosimetric index. The incident X-ray photons, proportionally to their fluence, partially reduce GO foils decreasing the amount of oxygen groups chemically bonded to carbon network. This decrease causes an increase on the CC/CO ratio that is correlated to the irradiation time, i.e. to the dose absorbed by the GO foil, showing a linear increment with the dose. Our preliminary investigations indicate that GO can be employed to realize a thin foil dosimeter giving a linear response to the absorbed dose in the (275.76 kGy divided by 8.02 MGy) range. The absorbed dose can be also evaluated by measuring the C/O ratio from the C1s and O1s XPS spectra analysis or with different techniques, as discussed in the paper.
Trvalý link: http://hdl.handle.net/11104/0308217