Nanosecond Laser-Assisted Nitrogen Doping of Graphene Oxide Dispersions.
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-2fluence), 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.
Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de la Universitat Autònoma Barcelona, 08193, Bellaterra, Spain.|Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001, Belgrade, Serbia.
Dejan
http://orcid.org/0000-0003-2777-6864
D
Kepić
Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de la Universitat Autònoma Barcelona, 08193, Bellaterra, Spain.
Stefania
S
Sandoval
Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de la Universitat Autònoma Barcelona, 08193, Bellaterra, Spain.
Ángel Pérez Del
ÁPD
Pino
Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de la Universitat Autònoma Barcelona, 08193, Bellaterra, Spain.|National Institute for Lasers, Plasma and Radiation Physics, P. O. Box MG 36, 77125, Bucharest, Romania.
Enikö
E
György
Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de la Universitat Autònoma Barcelona, 08193, Bellaterra, Spain.
Laura
L
Cabana
Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193, Barcelona, Spain.
Belén
http://orcid.org/0000-0002-1958-8911
B
Ballesteros
Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de la Universitat Autònoma Barcelona, 08193, Bellaterra, Spain.
Gerard
http://orcid.org/0000-0001-7116-2152
G
Tobias
N-doping; ammonia; graphene; lasers; reduced graphene oxide