Elucidating Quantum Confinement in Graphene Oxide Dots Based on Excitation-Wavelength-Independent Photoluminescence

Te Fu Yeh, Wei Lun Huang, Chung Jen Chung, I. Ting Chiang, Liang Che Chen, Hsin Yu Chang, Wu Chou Su, Ching Cheng, Shean Jen Chen, Hsisheng Teng

Research output: Contribution to journalArticlepeer-review

83 Citations (Scopus)

Abstract

Investigating quantum confinement in graphene under ambient conditions remains a challenge. In this study, we present graphene oxide quantum dots (GOQDs) that show excitation-wavelength-independent photoluminescence. The luminescence color varies from orange-red to blue as the GOQD size is reduced from 8 to 1 nm. The photoluminescence of each GOQD specimen is associated with electron transitions from the antibonding π (π∗) to oxygen nonbonding (n-state) orbitals. The observed quantum confinement is ascribed to a size change in the sp2 domains, which leads to a change in the π∗âπ gap; the n-state levels remain unaffected by the size change. The electronic properties and mechanisms involved in quantum-confined photoluminescence can serve as the foundation for the application of oxygenated graphene in electronics, photonics, and biology.

Original languageEnglish
Pages (from-to)2087-2092
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume7
Issue number11
DOIs
Publication statusPublished - 2016 Jun 2

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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