Nanosecond Laser‐Assisted Nitrogen Doping of Graphene Oxide Dispersions

Abstract

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 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.

Enhancement of the supercapacitive properties of laser deposited graphene-based electrodes through carbon nanotube loading and nitrogen doping

“…36,38 Consequently, there must be a contribution of pyridinic and pyrrolic N-C bonds to the C2 and C3 peaks of the C1s spectrum (binding energies at ca. 285.9 and 287.3 eV), 42,43 which may lead to a reduction of the relative quantity of hydroxyl-epoxide and carbonyl groups in these samples. As observed in Fig.…”

Comparison of Laser-Synthetized Nanographene-Based Electrodes for Flexible Supercapacitors

“…In particular, the LIG electrodes synthetized with the UV laser are of particular interest for the development of really inexpensive electrodes, since, using a low-cost and low-power laser, they achieve comparable results to that obtained with a CO 2 laser, which could be further improved by increasing the mechanical resolution of CNC system driving the laser. In addition, both fabrication approaches are also compatible with the techniques of functional nanomaterials growth, as well as doping procedures in the case of the GO, which would help to improve their electrochemical activity [56][57][58].…”

“…Micromachines 2020, 11, x 9 of 14 addition, both fabrication approaches are also compatible with the techniques of functional nanomaterials growth, as well as doping procedures in the case of the GO, which would help to improve their electrochemical activity [56][57][58]. However, it is also possible to obtain higher specific capacitances without resorting to any doping or additional treatment of the bare electrodes, simply by modifying the layout of these structures.…”

MAPLE synthesis of reduced graphene oxide/silver nanocomposite electrodes: Influence of target composition and gas ambience

“…Figure 2b shows the deconvolution of XPS N1s spectra for the same samples. The spectra can be deconvoluted in two peaks: NI located at 399.7 eV which is associated to amine groups and NII at 402 eV which corresponds to pyridinic N-O groups [61,62]. The latter peak is the less intense in both cases.…”