Modification of Graphene on a Copper Grid during Femtosecond Laser Irradiation: Electron Diffraction and Raman Spectroscopy Studies

• Published in: Journal of experimental and theoretical physics 2018-09, Vol.127 (3), p.422-429
• Main Authors: Mironov, B. N., Aseev, S. A., Sokolik, A. A., Mavrin, B. N., Timofeev, A. A., Ishchenko, A. A., Kochikov, I. V., Chekalin, S. V., Ryabov, E. A.
• Format: Article
• Language: English
• Subjects: Atoms; Chemical composition; Chemical compounds; Chemical reactions; CHEMICAL VAPOR DEPOSITION; CHRONIC IRRADIATION; Classical and Quantum Gravitation; COPPER; Copper compounds; COPPER OXIDES; ELECTRON BEAMS; ELECTRON DIFFRACTION; Electrons; Elementary Particles; Femtosecond pulses; GRAPHENE; Irradiation; LASER RADIATION; Lasers; Molecules; NANOSCIENCE AND NANOTECHNOLOGY; Optics; Organic chemistry; Particle and Nuclear Physics; Physics; Physics and Astronomy; PULSES; Quantum Field Theory; RAMAN SPECTROSCOPY; REFLECTION; Relativity Theory; Solid State Physics
• ISSN: 1063-7761; 1090-6509
• DOI: 10.1134/S1063776118080058

The modification of a graphene sheet, which was fabricated by chemical vapor deposition on a close-meshed copper grid, during powerful femtosecond laser irradiation is studied. The process of long-term irradiation of a sample in vacuum is found to be accompanied by (1) breaking carbon bonds, which is indicated by a decrease in the intensities of the reflections corresponding to electron-beam diffraction by graphene and (2) the formation of new products, which is indicated by the appearance of new diffraction rings and a change in the Raman spectrum of the sample. The compositions of the forming chemical compounds are analyzed. Copper oxides Cu 2 O and CuO are shown to form predominantly on the sample surface as a result of the chemical reactions induced by powerful femtosecond laser pulses.