Jellyfish-like few-layer graphene nanoflakes: Synthesis, oxidation, and hydrothermal N-doping

• Published in: Applied surface science Vol. 439; pp. 371 - 373
• Main Authors: Chernyak, Sergei A., Podgornova, Angelina M., Arkhipova, Ekaterina A., Novotortsev, Roman O., Egorova, Tolganay B., Ivanov, Anton S., Maslakov, Konstantin I., Savilov, Serguei V., Lunin, Valery V.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.2018
• Subjects: Functionalization; Graphene; Nanoflakes; Nitrogen-doped carbon; Post-doping; Nitrogen-doped carbon; Post-doping; Nanoflakes; Functionalization; Graphene
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2018.01.059

[Display omitted] •Few-layer graphene nanoflakes of 15–40 nm with the bent edges have been synthesized.•Oxidation by HNO3 led to the high O content, mostly as a part of carboxyls.•Oxidation and post-doping affected only edges of graphene sheets.•Low-temperature post-doping by N atoms using hydrothermal NH3 and urea treatment.•Raman spectroscopy, TEM, SEM, and XPS have been applied. Few-layer graphene nanoflakes with the bent edges, diameter of 15–40 nm and thickness of 6–7 graphene layers have been synthesized using MgO-templated CVD growth. Their oxidation by nitric acid led to the high oxygen content of 18 at.%, a third of which was attributed to carboxylic groups. Oxidized nanoflakes were post-doped by nitrogen groups using hydrothermal treatment at 220 °C with ammonia and urea water solutions resulting in corresponding nitrogen content of 7 and 5 at.%. Synthesized and treated materials were characterized by XPS, Raman spectroscopy and electron microscopy.