Effects of the Laser Irradiation on Graphene Oxide Foils in Vacuum and Air

Graphene oxide modifications induced by excimer laser irradiations

“…In agreement with the literature, the irradiation in vacuum of GO shows different results with respect to the case of the irradiation in air 26 . Figure 7 shows the Raman spectra comparison of UV laser irradiation in vacuum, normalizing to the G peak and subtracting the fitted background, using laser pulses from 2.5 mJ up to 7.5 mJ, that is, for fluences within 0.35 and 1.05 mJ/mm 2 .…”

“…Its increment is about 35% at 5 mJ and stabilizes at about 16% at higher In agreement with the literature, the irradiation in vacuum of GO shows different results with respect to the case of the irradiation in air. 26 Further investigations concerning the structure of GO modified by the laser irradiation in air and in vacuum were conducted using micro Raman spectroscopy of the irradiated surfaces. It demonstrates that the D peak grows with the laser pulse energy and that the disorder of the graphene in the GO sheets enhances both in air and in vacuum with an excess of disorder in the case of vacuum with respect to air irradiations.…”

“…GO laser irradiation is drastically modified by the laser irradiation and its changes depend on the laser parameters 23–25 (pulse energy and duration, wavelength, and fluence) and irradiation conditions (vacuum, air, gas, and focalization). For instance, significant difference occurs if the irradiation is performed in air or in vacuum, generally producing high oxygen reduction effects in vacuum and oxidation effects in air, as reported in the literature 26–28 . In this work, we focus on the study on defect generation in graphene, induced by exposure to an ultraviolet (UV) excimer laser, emitting 23‐ns pulses at 248‐nm wavelength.…”

“…For instance, significant difference occurs if the irradiation is performed in air or in vacuum, generally producing high oxygen reduction effects in vacuum and oxidation effects in air, as reported in the literature. [26][27][28] In this work, we focus on the study on defect generation in graphene, induced by exposure to an ultraviolet (UV) excimer laser, emitting 23-ns pulses at 248-nm wavelength. We compare the irradiation of GO substrates in air and under vacuum, showing through Raman spectroscopy, that, defects are introduced in both cases, at different rates.…”

Laser processing of graphene and related materials for energy storage: State of the art and future prospects

“…Different approaches have been reported for limiting the exposure to oxygen atoms from air during LrGO synthesis, with the intent of avoiding undue combustion. Examples are the laser irradiation of GO under inert/vacuum conditions or its confinement between transparent slices [124,135,136]. On the other hand, there are numerous reports of laser-induced reduction of GO in air without significant carbon loss [127,128].…”