Uniform Graphene Quantum Dots Patterned from Self-Assembled Silica Nanodots

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Jinsup Lee
  • Kyungho Kim
  • Woon Ik Park
  • Bo-Hyun Kim
  • Jong Hyun Park
  • Tae-Heon Kim
  • Sungyool Bong
  • Chul-Hong Kim
  • GeeSung Chae
  • Myungchul Jun
  • Yongkee Hwang
  • Yeon Sik Jung

Detail(s)

Original languageEnglish
Pages (from-to)6078-6083
Journal / PublicationNano Letters
Volume12
Issue number12
Online published13 Nov 2012
Publication statusPublished - 12 Dec 2012
Externally publishedYes

Abstract

Graphene dots precisely controlled in size are interesting in nanoelectronics due to their quantum optical and electrical properties. However, most graphene quantum dot (GQD) research so far has been performed based on flake-type graphene reduced from graphene oxides. Consequently, it is extremely difficult to isolate the size effect of GQDs from the measured optical properties. Here, we report the size-controlled fabrication of uniform GQDs using self-assembled block copolymer (BCP) as an etch mask on graphene films grown by chemical vapor deposition (CVD). Electron microscope images show that as-prepared GQDs are composed of mono- or bilayer graphene with diameters of 10 and 20 nm, corresponding to the size of BCP nanospheres. In the measured photoluminescence (PL) spectra, the emission peak of the GQDs on the SiO2 substrate is shown to be at ∼395 nm. The fabrication of GQDs was supported by the analysis of the Raman spectra and the observation of PL spectra after each fabrication step. Additionally, oxygen content in the GQDs is rationally controlled by additional air plasma treatment, which reveals the effect of oxygen content to the PL property. 

Research Area(s)

  • block copolymer, chemical vapor deposition, Graphene quantum dots, photoluminescence

Citation Format(s)

Uniform Graphene Quantum Dots Patterned from Self-Assembled Silica Nanodots. / Lee, Jinsup; Kim, Kyungho; Park, Woon Ik; Kim, Bo-Hyun; Park, Jong Hyun; Kim, Tae-Heon; Bong, Sungyool; Kim, Chul-Hong; Chae, GeeSung; Jun, Myungchul; Hwang, Yongkee; Jung, Yeon Sik; Jeon, Seokwoo.

In: Nano Letters, Vol. 12, No. 12, 12.12.2012, p. 6078-6083.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review