Photocontrolled molecular structural transition and doping in graphene
We studied chemical doping of trans- and cis-azobenzene on graphene by Raman spectroscopy. It was found that the molecule induces hole-doping in graphene through charge transfer. Moreover, the doping level in graphene can be reversibly modulated by a photocontrolled molecular conformation change. As...
| Main Authors: | , , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2013
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| Online Access: | https://hdl.handle.net/10356/96627 http://hdl.handle.net/10220/10293 |
| _version_ | 1811678169964478464 |
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| author | Peimyoo, Namphung Li, Jiewei Shang, Jingzhi Shen, Xiaonan Qiu, Caiyu Xie, Linghai Huang, Wei Yu, Ting |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Peimyoo, Namphung Li, Jiewei Shang, Jingzhi Shen, Xiaonan Qiu, Caiyu Xie, Linghai Huang, Wei Yu, Ting |
| author_sort | Peimyoo, Namphung |
| collection | NTU |
| description | We studied chemical doping of trans- and cis-azobenzene on graphene by Raman spectroscopy. It was found that the molecule induces hole-doping in graphene through charge transfer. Moreover, the doping level in graphene can be reversibly modulated by a photocontrolled molecular conformation change. As trans-azobenzene isomerizes to the cis configuration under UV irradiation, we probe the dynamic molecular structural evolution of azobenzene on graphene by Raman spectroscopy. Raman analysis indicates the precise orientation of cis-azobenzene on the graphene surface, which brings us further comprehension of the effect of conformation change on the electronic properties of graphene. In particular, the substantial decreases of the doping level and chemical enhancement of the molecular signal are attributed to the weakening of hole transfer from molecule to graphene, owing to the lifting of the electron-withdrawing group away from the graphene. Moreover, the calculation results exhibit the favorable configuration of cis-azobenzene, which is in good agreement with Raman spectroscopic analysis. Our results highlight an approach for employing graphene as a promising platform for probing molecular conformation transition at the submolecular level by Raman spectroscopy. |
| first_indexed | 2024-10-01T02:49:00Z |
| format | Journal Article |
| id | ntu-10356/96627 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:49:00Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-10356/966272020-03-07T12:34:43Z Photocontrolled molecular structural transition and doping in graphene Peimyoo, Namphung Li, Jiewei Shang, Jingzhi Shen, Xiaonan Qiu, Caiyu Xie, Linghai Huang, Wei Yu, Ting School of Physical and Mathematical Sciences We studied chemical doping of trans- and cis-azobenzene on graphene by Raman spectroscopy. It was found that the molecule induces hole-doping in graphene through charge transfer. Moreover, the doping level in graphene can be reversibly modulated by a photocontrolled molecular conformation change. As trans-azobenzene isomerizes to the cis configuration under UV irradiation, we probe the dynamic molecular structural evolution of azobenzene on graphene by Raman spectroscopy. Raman analysis indicates the precise orientation of cis-azobenzene on the graphene surface, which brings us further comprehension of the effect of conformation change on the electronic properties of graphene. In particular, the substantial decreases of the doping level and chemical enhancement of the molecular signal are attributed to the weakening of hole transfer from molecule to graphene, owing to the lifting of the electron-withdrawing group away from the graphene. Moreover, the calculation results exhibit the favorable configuration of cis-azobenzene, which is in good agreement with Raman spectroscopic analysis. Our results highlight an approach for employing graphene as a promising platform for probing molecular conformation transition at the submolecular level by Raman spectroscopy. 2013-06-13T02:21:52Z 2019-12-06T19:33:09Z 2013-06-13T02:21:52Z 2019-12-06T19:33:09Z 2012 2012 Journal Article Peimyoo, N., Li, J., Shang, J., Shen, X., Qiu, C., Xie, L., et al. (2012). Photocontrolled Molecular Structural Transition and Doping in Graphene. ACS Nano, 6(10), 8878-8886. 1936-0851 https://hdl.handle.net/10356/96627 http://hdl.handle.net/10220/10293 10.1021/nn302876w en ACS nano © 2012 American Chemical Society. |
| spellingShingle | Peimyoo, Namphung Li, Jiewei Shang, Jingzhi Shen, Xiaonan Qiu, Caiyu Xie, Linghai Huang, Wei Yu, Ting Photocontrolled molecular structural transition and doping in graphene |
| title | Photocontrolled molecular structural transition and doping in graphene |
| title_full | Photocontrolled molecular structural transition and doping in graphene |
| title_fullStr | Photocontrolled molecular structural transition and doping in graphene |
| title_full_unstemmed | Photocontrolled molecular structural transition and doping in graphene |
| title_short | Photocontrolled molecular structural transition and doping in graphene |
| title_sort | photocontrolled molecular structural transition and doping in graphene |
| url | https://hdl.handle.net/10356/96627 http://hdl.handle.net/10220/10293 |
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