Folding and cracking of graphene oxide sheets upon deposition |
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Authors: | Deepak K Pandey Ting Fung Chung G Prakash R Piner Yong P Chen R Reifenberger |
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Institution: | 1. Department of Physics, Purdue University W. Lafayette IN 47907, United States;2. Brick Nanotechnology Center, Purdue University W. Lafayette IN 47907, United States;3. Department of Mechanical Engineering, Mechanical Engineering Dept., The University of Texas at Austin, Austin, TX 78712-0292, United States |
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Abstract: | Graphene Oxide (GO) sheets, suspended in an aqueous solution, were deposited on freshly cleaved highly oriented pyrolytic graphite (HOPG) and studied using Raman spectroscopy, atomic force microscopy (AFM) and scanning tunneling microscopy (STM). AFM phase imaging shows a distinct contrast between GO and the underlying HOPG substrate. Raman spectroscopy clearly showed the presence of GO sheets on the top of HOPG substrate. The AFM and STM images also reveal wrinkling, folding, and tearing of individual GO sheets after depositing onto an HOPG substrate. We have also observed a distinct cracking of a GO sheet after folding. We attribute this new cracking phenomenon to a weakening of C–C bonds during the oxidation of a graphene sheet. |
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