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Wavelength effect of ns-pulsed radiation on the reduction of graphene oxide

de Lima, B.S. ; Bernardi, M.I.B. ; Mastelaro, V.R.

Applied surface science, 2020-03, Vol.506, p.144808, Article 144808 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    Wavelength effect of ns-pulsed radiation on the reduction of graphene oxide
  • Autor: de Lima, B.S. ; Bernardi, M.I.B. ; Mastelaro, V.R.
  • Assuntos: Photochemical ; Photothermal ; Reduction ; rGO ; Wavelength
  • É parte de: Applied surface science, 2020-03, Vol.506, p.144808, Article 144808
  • Descrição: [Display omitted] •This report studies the laser-assisted reduction process of GO films using four different wavelengths, 1064, 532, 355, and 266 nm.•Ultra-violet radiation removes oxygenated groups more efficiently while infra-red radiation restores the sp2 structure of grapheme.•The C/O ratio is higher than 100 by using both UV and IR radiation in the reduction process.•Laser-induced periodic surface structures were observed in the reduction process with all wavelengths. Laser-based methods to reduce of Graphene Oxide (GO) have been pointed out as a promising methodology to produce reduced graphene (rGO) due to its potential for scalable production without the use of chemicals and the processing taking place in ambient conditions. Within this context, this study presents the results of a systematic investigation of the reduction of graphene oxide films by means of an Nd:YAG pulsed laser radiation using wavelengths ranging from Ultra-Violet (UV) to Infra-Red (IR). Our results demonstrated that the reduction carried out using infrared (λ = 1064 nm) and visible radiation (λ = 532 nm) yield higher sp3-sp2 conversion as a consequence of photothermal reduction. On the other hand, UV radiation is more efficient in removing oxygen groups due to an enhanced photochemical effect. Furthermore, our results demonstrate that rGO films with C/O ratio greater than 100 can be produced if both photochemical and photothermal effects are present in the reduction process.
  • Editor: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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