Fluorescence Modulation of Graphene Quantum Dots Near Structured Silver Nanofilms
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Pages (from-to) | 14079-14086 |
Journal / Publication | ACS Applied Materials and Interfaces |
Volume | 10 |
Issue number | 16 |
Online published | 10 Apr 2018 |
Publication status | Published - 25 Apr 2018 |
Externally published | Yes |
Link(s)
Abstract
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.
Research Area(s)
- fluorescence enhancement, fluorescence lifetime, graphene quantum dot, silver nanofilms, surface plasmon
Citation Format(s)
Fluorescence Modulation of Graphene Quantum Dots Near Structured Silver Nanofilms. / Chae, Weon-Sik; Yun, Jungheum; Nam, Sang-Hyeon; Lee, Sang-Geul; Yang, Won-Geun; Yoon, Hyewon; Park, Minsu; Jeon, Seokwoo.
In: ACS Applied Materials and Interfaces, Vol. 10, No. 16, 25.04.2018, p. 14079-14086.Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review