Tuning Enhancement Efficiency of Multiple Emissive Centers in Graphene Quantum Dots by Core-Shell Plasmonic Nanoparticles

Wang, S; Clapper, A; Chen, P; Wang, L; Aharonovich, I; Jin, D; Li, Q

Tuning Enhancement Efficiency of Multiple Emissive Centers in Graphene Quantum Dots by Core-Shell Plasmonic Nanoparticles

Wang, S Clapper, A Chen, P Wang, L Aharonovich, I

Jin, D

Li, Q

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Publication Type:: Journal Article
Citation:: Journal of Physical Chemistry Letters, 2017, 8 (22), pp. 5673 - 5679
Issue Date:: 2017-11-16

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Field	Value	Language
dc.contributor.author	Wang, S	en_US
dc.contributor.author	Clapper, A	en_US
dc.contributor.author	Chen, P	en_US
dc.contributor.author	Wang, L	en_US
dc.contributor.author	Aharonovich, I https://orcid.org/0000-0003-4304-3935	en_US
dc.contributor.author	Jin, D https://orcid.org/0000-0003-1046-2666	en_US
dc.contributor.author	Li, Q	en_US
dc.date.issued	2017-11-16	en_US
dc.identifier.citation	Journal of Physical Chemistry Letters, 2017, 8 (22), pp. 5673 - 5679	en_US
dc.identifier.uri	http://hdl.handle.net/10453/124773
dc.description.abstract	© 2017 American Chemical Society. Graphene quantum dots (GQDs) are emerging luminescent nanomaterials for energy, bioimaging, and optoelectronic applications. However, unlike conventional fluorophores, GQDs contain multiple emissive centers that result in a complex interaction with external electromagnetic fields. Here we utilize core-shell plasmonic nanoparticles to simultaneously enhance and modulate the photoluminescence (PL) intensities and spectral profiles of GQDs. By analyzing the spectral profiles, we show that the emissive centers are highly influenced by the proximity to the metal particles. Under optimal spacer thickness of 25 nm, the overall PL displays a four-fold enhancement compared with a pristine GQD. However, detailed lifetime measurements indicate the presence of midgap states that act as the bottleneck for further enhancement. Our results offer new perspectives for fundamental understanding and new design of functional luminescent materials (e.g., GQDs, graphene oxide, carbon dots) for imaging, sensing, and light harvesting.	en_US
dc.relation.ispartof	Journal of Physical Chemistry Letters	en_US
dc.relation.isbasedon	10.1021/acs.jpclett.7b02550	en_US
dc.title	Tuning Enhancement Efficiency of Multiple Emissive Centers in Graphene Quantum Dots by Core-Shell Plasmonic Nanoparticles	en_US
dc.type	Journal Article
utslib.citation.volume	22	en_US
utslib.citation.volume	8	en_US
utslib.for	0306 Physical Chemistry (incl. Structural)	en_US
utslib.for	0203 Classical Physics	en_US
utslib.for	02 Physical Sciences	en_US
utslib.for	03 Chemical Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - IBMD - Initiative for Biomedical Devices
utslib.copyright.status	closed_access
pubs.issue	22	en_US
pubs.publication-status	Published	en_US
pubs.volume	8	en_US

Abstract:

© 2017 American Chemical Society. Graphene quantum dots (GQDs) are emerging luminescent nanomaterials for energy, bioimaging, and optoelectronic applications. However, unlike conventional fluorophores, GQDs contain multiple emissive centers that result in a complex interaction with external electromagnetic fields. Here we utilize core-shell plasmonic nanoparticles to simultaneously enhance and modulate the photoluminescence (PL) intensities and spectral profiles of GQDs. By analyzing the spectral profiles, we show that the emissive centers are highly influenced by the proximity to the metal particles. Under optimal spacer thickness of 25 nm, the overall PL displays a four-fold enhancement compared with a pristine GQD. However, detailed lifetime measurements indicate the presence of midgap states that act as the bottleneck for further enhancement. Our results offer new perspectives for fundamental understanding and new design of functional luminescent materials (e.g., GQDs, graphene oxide, carbon dots) for imaging, sensing, and light harvesting.

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http://hdl.handle.net/10453/124773