Journal
NANO LETTERS
Volume 11, Issue 9, Pages 3951-3956Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl202240s
Keywords
Mn2+-bonded rGO; sp(2) clusters; enhanced and tunable photoluminescence; resonance energy transfer
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Funding
- National Basic Research Programs of China [2007CB936301, 2011 CB922102]
- National Natural Science Foundation
- Jiangsu Natural Science Foundation [BK2008020, 60976063]
- Hong Kong Research Grants Council (RGC) [CityU 112510]
- City University of Hong Kong [7008009]
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The photoluminescence (PL) characteristics of Mn2+-bonded reduced graphene oxide (rGO) are studied in details. The Mn2+-bonded rGO is synthesized using MnO2-decorated GO as the intermediate products and ideal tunable PL is obtained by enhancing the long-wavelength (450-550 nm) emission. The PL spectra excited by different wavelengths are analyzed to elucidate the mechanism, and the resonant energy transfer between Mn2+ and sp(2) clusters of the rGO appears to be responsible for the enhanced long-wavelength emission. To examine the effect of Mn2+ on the long-wavelength emission from the Mn2+-bonded rGO, the PL characteristics of Mn2+-bonded rGO with smaller Mn concentrations are studied and weaker emission is observed. Our theoretical calculation corroborates the experimental results.
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