Electronic Structures and Structural Evolution of Hydrogenated Graphene Probed by Raman Spectroscopy
The electronic structures and structural evolution of hydrogenated graphene are investigated by Raman spectroscopy with multiple excitations. The excitation energy dependent saturation effect on the ratio of integrated intensities of D and G modes (I D/I G) is revealed and interpreted by a D band ac...
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| Published in | Journal of physical chemistry. C Vol. 115; no. 5; pp. 1422 - 1427 |
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| Main Authors | , , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
American Chemical Society
10.02.2011
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| Abstract | The electronic structures and structural evolution of hydrogenated graphene are investigated by Raman spectroscopy with multiple excitations. The excitation energy dependent saturation effect on the ratio of integrated intensities of D and G modes (I D/I G) is revealed and interpreted by a D band active model with D band Raman relaxation length and photoexcited electron/hole wavelength as critical length scales. At low hydrogen coverage, the chemisorbed H atoms behave like defects in sp2 CC matrix; for a high hydrogen coverage, the sp3 C−H bonds become coalescent clusters resulting in confinement effect on the sp2 C domains. Electronic structure changes caused by varying hydrogen coverage are evidenced by excitation energy dependent red shift of D and 2D bands. Our results provide a useful guide for developing applications of hydrogenated graphene as well as for using Raman spectroscopy for quick characterization in further exploring other kinds of graphene derivatives. |
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| AbstractList | The electronic structures and structural evolution of hydrogenated graphene are investigated by Raman spectroscopy with multiple excitations. The excitation energy dependent saturation effect on the ratio of integrated intensities of D and G modes (I D/I G) is revealed and interpreted by a D band active model with D band Raman relaxation length and photoexcited electron/hole wavelength as critical length scales. At low hydrogen coverage, the chemisorbed H atoms behave like defects in sp2 CC matrix; for a high hydrogen coverage, the sp3 C−H bonds become coalescent clusters resulting in confinement effect on the sp2 C domains. Electronic structure changes caused by varying hydrogen coverage are evidenced by excitation energy dependent red shift of D and 2D bands. Our results provide a useful guide for developing applications of hydrogenated graphene as well as for using Raman spectroscopy for quick characterization in further exploring other kinds of graphene derivatives. |
| Author | Shen, Zexiang Lin, Jianyi Luo, Zhiqiang Lim, Sanhua Hu, Hailong Ni, Zhenhua Liu, Lei Yu, Ting Shang, Jingzhi |
| AuthorAffiliation | Institute of Chemical and Engineering Sciences Southeast University Nanyang Technological University |
| AuthorAffiliation_xml | – name: Southeast University – name: Institute of Chemical and Engineering Sciences – name: Nanyang Technological University |
| Author_xml | – sequence: 1 givenname: Zhiqiang surname: Luo fullname: Luo, Zhiqiang – sequence: 2 givenname: Ting surname: Yu fullname: Yu, Ting – sequence: 3 givenname: Zhenhua surname: Ni fullname: Ni, Zhenhua – sequence: 4 givenname: Sanhua surname: Lim fullname: Lim, Sanhua – sequence: 5 givenname: Hailong surname: Hu fullname: Hu, Hailong – sequence: 6 givenname: Jingzhi surname: Shang fullname: Shang, Jingzhi – sequence: 7 givenname: Lei surname: Liu fullname: Liu, Lei – sequence: 8 givenname: Zexiang surname: Shen fullname: Shen, Zexiang email: Zexiang@ntu.edu.sg, lin_jianyi@ices.a-star.edu.sg – sequence: 9 givenname: Jianyi surname: Lin fullname: Lin, Jianyi email: Zexiang@ntu.edu.sg, lin_jianyi@ices.a-star.edu.sg |
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