Fluorescence Modulation of Graphene Quantum Dots Near Structured Silver Nanofilms

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Here, we study the plasmonic metal-enhanced fluorescence properties of blue-emitting graphene quantum dots (GQDs) and green-emitting graphene oxide quantum dots (GOQDs) using fluorescence lifetime imaging microscopy. Reactive ion sputtered silver (Ag) on zinc oxide (ZnO) thin films deposited on silicon (Si) wafers are used as the substrates. The morphology of the sputtered Ag gradually changes from nanoislands, via and elongated network and a continuous film with nanoholes, to a continuous film with increasing sputtering time. The fluorescence properties of GQD and GOQD on the Ag are modulated in terms of the intensities and lifetimes as the morphology of the Ag layers changes. Although both GQD and GOQD show similar fluorescence modulation on the Ag nanofilms, the fluorescence of GQD is enhanced, whereas that of GOQD is quenched due to the charge transfer process from GOQD to ZnO. Moreover, the GQD and GOQD exhibit different fluorescence lifetimes due to the effect of their electronic configurations. The theoretical calculation explains that the fluorescence amplification on the Ag nanofilms can largely be attributed to the enhanced absorption mechanism arising from accumulated optical fields around nanogaps and nanovoids in the Ag nanofilms.
Publisher
AMER CHEMICAL SOC
Issue Date
2018-04
Language
English
Article Type
Article
Keywords

METAL-ENHANCED FLUORESCENCE; SIZE-CONTROLLED SYNTHESIS; GOLD NANOPARTICLES; NANOPOROUS GOLD; BIOMEDICAL APPLICATIONS; RAMAN-SPECTROSCOPY; SOLAR-CELLS; SURFACE; ARRAYS; NANOSTRUCTURES

Citation

ACS APPLIED MATERIALS & INTERFACES, v.10, no.16, pp.14079 - 14086

ISSN
1944-8244
DOI
10.1021/acsami.7b19524
URI
http://hdl.handle.net/10203/242253
Appears in Collection
MS-Journal Papers(저널논문)
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