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

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Author(s)

  • Weon-Sik Chae
  • Jungheum Yun
  • Sang-Hyeon Nam
  • Sang-Geul Lee
  • Won-Geun Yang
  • Hyewon Yoon
  • Minsu Park

Detail(s)

Original languageEnglish
Pages (from-to)14079-14086
Journal / PublicationACS Applied Materials and Interfaces
Volume10
Issue number16
Online published10 Apr 2018
Publication statusPublished - 25 Apr 2018
Externally publishedYes

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