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

研究成果: Article同行評審

144 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)2087-2092
頁數6
期刊Journal of Physical Chemistry Letters
7
發行號11
DOIs
出版狀態Published - 2016 6月 2

All Science Journal Classification (ASJC) codes

  • 材料科學(全部)
  • 物理與理論化學

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