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SM ISO690:2012 CALIZO, Irene G., BEJENARI, Igor, RAHMAN, uhammad Mustafizur Mizanur Hafizur, LIU, Guanxiong, BALANDIN, Alexander A.. Ultraviolet Raman microscopy of single and multilayer graphene. In: Journal of Applied Physics, 2009, vol. 106, p. 0. ISSN 0021-8979. DOI: https://doi.org/10.1063/1.3197065 |
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Journal of Applied Physics | |
Volumul 106 / 2009 / ISSN 0021-8979 /ISSNe 1089-7550 | |
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DOI:https://doi.org/10.1063/1.3197065 | |
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We investigated Raman spectra of single-layer and multilayer graphene under ultraviolet laser excitation at the wavelength λ=325 nm. It was found that while graphene's G peak remains pronounced in UV Raman spectra, the 2D -band intensity undergoes severe quenching. The evolution of the ratio of the intensities of the G and 2D peaks, I (G) /I (2D), as the number of graphene layers n changes from n=1 to n=5, is different in UV Raman spectra from that in conventional visible Raman spectra excited at the 488 and 633 nm wavelengths. The 2D band under UV excitation shifts to larger wave numbers and is found near 2825 cm-1. The observed UV Raman features of graphene were explained by invoking the resonant scattering model. The obtained results contribute to the Raman nanometrology of graphene by providing an additional metric for determining the number of graphene layers and assessing its quality. |
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Cuvinte-cheie Engineering controlled terms Laser excitation, multilayers, Quenching, Raman scattering, Raman spectroscopy Engineering uncontrolled terms Band intensity, Graphene layers, Graphenes, nanometrology, Raman microscopy, Raman spectra, Resonant scattering, Single layer, Ultraviolet laser, UV excitation, UV-Raman, UV-Raman spectra, Visible Raman spectra, Wave numbers Engineering main heading Graphite |
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