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Nano Research 2016, 9(6): 1866-1875 https://doi.org/10.1007/s12274-016-1079-9
Research Article | Issue | Published: 29 April 2016

Surface plasmon enhancement of photoluminescence in photo-chemically synthesized graphene quantum dot and Au nanosphere

Show Author's Information Byeongho Park§,  Sun Jun Kim§,  Ji Soo Sohn,  Min Sik Nam,  Shinill Kang,  Seong Chan Jun( )
School of Mechanical EngineeringYonsei University50 Yonsei-ro, Seodaemun-gu, Seoul120-749Republic of Korea

§ These authors contributed equally to this work.

Keywords:
gold, UV irradiation, photoluminescence, graphene quantum dot, nanosphere
Cite this article:
Park B, Kim SJ, Sohn JS, et al. Surface plasmon enhancement of photoluminescence in photo-chemically synthesized graphene quantum dot and Au nanosphere. Nano Research, 2016, 9(6): 1866-1875. https://doi.org/10.1007/s12274-016-1079-9
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Abstract Full text Electronic supplementary material About this article

Graphene quantum dots (GQDs) are promising candidates for potential applications such as novel optoelectronic devices and bio-imaging. However, insufficient light absorption to exhibit their intriguing characteristics. The strong confinement of light caused by the Au nanoparticles as an antenna can considerably boost the light absorption. With the assistance of ultraviolet irradiation, we prepared bluish-green luminescent nanospheres by the hybridization of GQD and Au nanoparticles (GQD/Au). These nanospheres showed a photoluminescence quantum yield of up to 26.9%. The GQD/Au nanospheres were synthesized using a solution of GQDs and HAuCl4 by a photochemical method with the reduction of GQDs and the formation of metallic Au. The GQDs and Au nanoparticles self-assembled and aggregated into nanospheres via aurophilicity and hydrogen bonding interactions. The average size of the GQD/Au nanospheres was found to be in the range of 150–170 nm, which is much larger than that of the pristine GQDs (4–7 nm). The GQD/Au nanospheres exhibited an absorption band at 541 nm, which indicates the presence of Au in the nanospheres. The typical absorbance features of GQDs were observed near 236 and 303 nm. The photoluminescence characteristics were investigated using the excitation and emission spectra. The GQD/Au nanospheres exhibited two emission peaks at 468 and 529 nm in the visible range. The green fluorescent peak located at 529 nm was newly generated by the hybridization. The GQD/Au nanospheres showed an emission efficiency which was two times more than that of the intrinsic GQDs. The reason for this increase was the surface plasmon resonance from the Au particles, which improved the fluorescence property of the resulting nanospheres. These nanospheres can be perceived as outstanding candidates for applications such as displays, optoelectronic devices, and imaging of the biological samples with high emission intensity.


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Abstract
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Electronic supplementary material
About this article

Surface plasmon enhancement of photoluminescence in photo-chemically synthesized graphene quantum dot and Au nanosphere

Show Author's information Byeongho Park§, Sun Jun Kim§, Ji Soo Sohn, Min Sik Nam, Shinill Kang, Seong Chan Jun( )
School of Mechanical EngineeringYonsei University50 Yonsei-ro, Seodaemun-gu, Seoul120-749Republic of Korea

§ These authors contributed equally to this work.

Abstract

Graphene quantum dots (GQDs) are promising candidates for potential applications such as novel optoelectronic devices and bio-imaging. However, insufficient light absorption to exhibit their intriguing characteristics. The strong confinement of light caused by the Au nanoparticles as an antenna can considerably boost the light absorption. With the assistance of ultraviolet irradiation, we prepared bluish-green luminescent nanospheres by the hybridization of GQD and Au nanoparticles (GQD/Au). These nanospheres showed a photoluminescence quantum yield of up to 26.9%. The GQD/Au nanospheres were synthesized using a solution of GQDs and HAuCl4 by a photochemical method with the reduction of GQDs and the formation of metallic Au. The GQDs and Au nanoparticles self-assembled and aggregated into nanospheres via aurophilicity and hydrogen bonding interactions. The average size of the GQD/Au nanospheres was found to be in the range of 150–170 nm, which is much larger than that of the pristine GQDs (4–7 nm). The GQD/Au nanospheres exhibited an absorption band at 541 nm, which indicates the presence of Au in the nanospheres. The typical absorbance features of GQDs were observed near 236 and 303 nm. The photoluminescence characteristics were investigated using the excitation and emission spectra. The GQD/Au nanospheres exhibited two emission peaks at 468 and 529 nm in the visible range. The green fluorescent peak located at 529 nm was newly generated by the hybridization. The GQD/Au nanospheres showed an emission efficiency which was two times more than that of the intrinsic GQDs. The reason for this increase was the surface plasmon resonance from the Au particles, which improved the fluorescence property of the resulting nanospheres. These nanospheres can be perceived as outstanding candidates for applications such as displays, optoelectronic devices, and imaging of the biological samples with high emission intensity.

Keywords: gold, UV irradiation, photoluminescence, graphene quantum dot, nanosphere

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Publication history
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Acknowledgements

Publication history

Received: 16 November 2015
Revised: 18 March 2016
Accepted: 21 March 2016
Published: 29 April 2016
Issue date: June 2016

Copyright

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2016

Acknowledgements

Acknowledgements

This work was partially supported by the Priority Research Centers Program (No. 2009-0093823), the Basic Science Research Program (No. 2013063062), the Korean Government (MSIP) (No. 2015R1A5A1037668) through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (MEST).

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