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Title: Mega-electron-volt proton irradiation on supported and suspended graphene: A Raman spectroscopic layer dependent study
Authors: Mathew, S. 
Chan, T.K. 
Zhan, D.
Gopinadhan, K. 
Roy Barman, A.
Breese, M.B.H. 
Dhar, S. 
Shen, Z.X.
Venkatesan, T. 
Thong, J.T.L. 
Issue Date: 15-Oct-2011
Citation: Mathew, S., Chan, T.K., Zhan, D., Gopinadhan, K., Roy Barman, A., Breese, M.B.H., Dhar, S., Shen, Z.X., Venkatesan, T., Thong, J.T.L. (2011-10-15). Mega-electron-volt proton irradiation on supported and suspended graphene: A Raman spectroscopic layer dependent study. Journal of Applied Physics 110 (8) : -. ScholarBank@NUS Repository.
Abstract: Graphene samples with 1, 2, and 4 layers and 1 + 1 folded bi-layers and graphite have been irradiated with 2 MeV protons at fluences ranging from 1 × 1015 to 6 × 1018 ions/cm2. The samples were characterized using visible and UV Raman spectroscopy and Raman microscopy. The ion-induced defects were found to decrease with increasing number of layers. Graphene samples suspended over etched holes in SiO 2 have been fabricated and used to investigate the influence of the substrate SiO2 for defect creation in graphene. While Raman vibrational modes at 1460 cm-1 and 1555 cm-1 have been observed in the visible Raman spectra of substantially damaged graphene samples, these modes were absent in the irradiated-suspended monolayer graphene. © 2011 American Institute of Physics.
Source Title: Journal of Applied Physics
ISSN: 00218979
DOI: 10.1063/1.3647781
Appears in Collections:Staff Publications

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