Graphene Oxide (GO) solution was purchased from Graphenea (San Sebastián, Spain), subjected to sonication (Vibra cell sonicator VC505, Sonics and Materials, Newton, CT, USA) and centrifugation (Hermle Z 216 MK, Hermle Labortechnik, Wehingen, Germany), to obtain GO sheets with a size of about 400 nm. Finally, GO concentration was measured by UV-Vis spectrophotometry, and—in this work—it was kept to 0.25 mg/mL. Further details of GO sizing, centrifugation and characterization can be found elsewhere [28 (link)].
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