Nanosecond Laser-Assisted Nitrogen Doping of Graphene Oxide Dispersions

Dejan Kepić, Stefania Sandoval, Ángel Pérez del Pino, Enikö György, Laura Cabana, Belén Ballesteros, Gerard Tobias

    Research output: Contribution to journalArticleResearchpeer-review

    12 Citations (Scopus)

    Abstract

    © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim N-doped reduced graphene oxide (RGO) has been prepared in bulk form by laser irradiation of graphene oxide (GO) dispersed in an aqueous solution of ammonia. A pulsed Nd:YAG laser with emission wavelengths in the infrared (IR) 1064 nm, visible (Vis) 532 nm, and ultraviolet (UV) 266 nm spectral regions was employed for the preparation of the N-doped RGO samples. Regardless of the laser energy employed, the resulting material presents a higher fraction of pyrrolic nitrogen compared to nitrogen atoms in pyridinic and graphitic coordination. Noticeably, whereas increasing the laser fluence of UV and Vis wavelengths results in an increase in the total amount of nitrogen, up to 4.9 at. % (UV wavelength at 60 mJ cm−2 fluence), the opposite trend is observed when the GO is irradiated in ammonia solution through IR processing. The proposed laser-based methodology allows the bulk synthesis of N-doped reduced graphene oxide in a simple, fast, and cost efficient manner.
    Original languageEnglish
    Pages (from-to)935-941
    JournalChemPhysChem
    Volume18
    Issue number8
    DOIs
    Publication statusPublished - 19 Apr 2017

    Keywords

    • N-doping
    • ammonia
    • graphene
    • lasers
    • reduced graphene oxide

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