| Abstract [eng] |
Graphene and its derivatives have an increasing applications in Raman spectroscopy due to its unique optical and electromagnetic properties. This work focuses on graphene oxide (GO) and dye composite properties and their application to Raman spectrometry. Graphene oxide was prepared by exfoliating graphite oxide. The synthesis of graphite oxide was performed by Hummers and modified Hummers methods. The aqueouscomposite suspensions were produced by combining GO and an organic dye – crystal violet (CV) or Congo red (CR). The composite coatings were prepared by filtering these suspensions through a polycarbonate (PC) membrane filter. The gold nanoparticles (AuNP; 9.38 nm in diameter) synthesized in the laboratory were precipitated onto the composite coatings, and formed GO-AuNP-dye hybrid composite coatings. The powder of GO was characterized using X-ray diffraction analysis (XRD), dynamic light scattering analysis (DLS), Fourier transformation infrared (FTIR) spectroscopy and Raman spectroscopy. GO particle size in a coloidal solution and defectivity were thus determined. The aqueous GO composite suspensions were analysed using UV-Vis absorption analysis, FTIR spectroscopy and Raman spectroscopy. The hybrid Go-AuNP-dye composite coatings were analyzed using Raman spectroscopy. The spectra (FTIR and Raman) of coatings were analysed and specific vibration peaks and their relative shifts were identified. Based on the obtained results, the effect of of Surface enhanced Raman scattering (SERS) in dried GO composite suspensions and hybrid composite coatings was assessed. |
