Quantum Confinement Effect in the Absorption Spectra of Graphene Quantum Dots

Leon Yang, Devon Reed, Kofi W. Adu, Ana Laura Elias Arriaga

Research output: Contribution to journalArticle

Abstract

Our preliminary investigation of the absorption and the photoluminescence response of selectively separated graphene quantum dots using centrifugation indicate that the photoluminescence is more sensitive to the size of the quantum dot than the absorption. We observed ∼143nm blueshift from 623nm to 480nm in the visible region of the photoluminescence with increasing successive centrifugation (decreasing size) and not in the corresponding absorption spectra in the visible region. However, for the first time, we observed a blueshift in the absorption spectra in the UV regions that is tentatively attributed to quantum confinement. Further detailed work is underway to confirm the blueshift in the absorption and correlate with deep UV photoluminescence and morphological quantification of the quantum dots size distribution using high resolution transmission electron microscope.

Original languageEnglish (US)
Pages (from-to)205-210
Number of pages6
JournalMRS Advances
Volume4
Issue number3-4
DOIs
StatePublished - Jan 1 2019

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Quantum confinement
Graphite
Graphene
Semiconductor quantum dots
Absorption spectra
Photoluminescence
graphene
quantum dots
absorption spectra
photoluminescence
Centrifugation
Electron microscopes
electron microscopes
high resolution

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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abstract = "Our preliminary investigation of the absorption and the photoluminescence response of selectively separated graphene quantum dots using centrifugation indicate that the photoluminescence is more sensitive to the size of the quantum dot than the absorption. We observed ∼143nm blueshift from 623nm to 480nm in the visible region of the photoluminescence with increasing successive centrifugation (decreasing size) and not in the corresponding absorption spectra in the visible region. However, for the first time, we observed a blueshift in the absorption spectra in the UV regions that is tentatively attributed to quantum confinement. Further detailed work is underway to confirm the blueshift in the absorption and correlate with deep UV photoluminescence and morphological quantification of the quantum dots size distribution using high resolution transmission electron microscope.",
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Quantum Confinement Effect in the Absorption Spectra of Graphene Quantum Dots. / Yang, Leon; Reed, Devon; Adu, Kofi W.; Elias Arriaga, Ana Laura.

In: MRS Advances, Vol. 4, No. 3-4, 01.01.2019, p. 205-210.

Research output: Contribution to journalArticle

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