In this paper, we report single layer graphene (SLG) hybridized with silver nanoplates, in which nanoplates act as either a charge doping or a field enhancement source for the SLG Raman spectrum. Surprisingly, the stiffening of both G and 2D peaks of more than 10 cm−1 was observed with no plasmonic enhancement of peaks, indicating that p-doping from nanoplates on SLG is occurring. Such observation is explained in terms of the contact separation distance between the graphene and the silver nanoplates being enough (∼4 Å) to cause a Fermi level shift in graphene to allow p-doping. When nanoplates were modified in shape with laser irradiation by either photothermal plasmon printing or laser induced ablation, the charge doping was lifted and the strong plasmonic enhancement of Raman signals was observed, indicating that the separation distance is increased. Further, when the nanoplates are oxidized, the two effects on the Raman bands of SLG are turned off, returning the Raman signals back to the original SLG state.
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5 September 2016
Research Article|
September 08 2016
Single layer graphene band hybridization with silver nanoplates: Interplay between doping and plasmonic enhancement
Salmaan R. Syed;
Salmaan R. Syed
a)
1Centre for Micro-Photonics, Department of Physics, Faculty of Science, Engineering and Technology,
Swinburne University of Technology
, PO Box 218, Hawthorn, 3122 Victoria, Australia
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Guh-Hwan Lim;
Guh-Hwan Lim
a)
2School of Advanced Materials Science and Engineering,
Sungkyunkwan University (SKKU)
, Suwon 16419, South Korea
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Stuart J. Flanders;
Stuart J. Flanders
1Centre for Micro-Photonics, Department of Physics, Faculty of Science, Engineering and Technology,
Swinburne University of Technology
, PO Box 218, Hawthorn, 3122 Victoria, Australia
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Adam B. Taylor;
Adam B. Taylor
1Centre for Micro-Photonics, Department of Physics, Faculty of Science, Engineering and Technology,
Swinburne University of Technology
, PO Box 218, Hawthorn, 3122 Victoria, Australia
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Byungkwon Lim;
Byungkwon Lim
b)
2School of Advanced Materials Science and Engineering,
Sungkyunkwan University (SKKU)
, Suwon 16419, South Korea
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James W. M. Chon
James W. M. Chon
b)
1Centre for Micro-Photonics, Department of Physics, Faculty of Science, Engineering and Technology,
Swinburne University of Technology
, PO Box 218, Hawthorn, 3122 Victoria, Australia
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a)
S. R. Syed and G.-H. Lim contributed equally to this work.
b)
Electronic addresses: [email protected] and [email protected]
Appl. Phys. Lett. 109, 103103 (2016)
Article history
Received:
May 31 2016
Accepted:
August 26 2016
Citation
Salmaan R. Syed, Guh-Hwan Lim, Stuart J. Flanders, Adam B. Taylor, Byungkwon Lim, James W. M. Chon; Single layer graphene band hybridization with silver nanoplates: Interplay between doping and plasmonic enhancement. Appl. Phys. Lett. 5 September 2016; 109 (10): 103103. https://doi.org/10.1063/1.4962401
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