Abstract
Graphene quantum dots (GQDs) are synthesized from bio-waste and are further modified to produce amine-terminated GQDs (Am-GQDs) which have higher dispersibility and photoluminescence intensity than those of GQDs. A strong fluorescence quenching of Am-GQDs (switch-off) is observed for a number of metal ions, but only for the Ag(+) ions is the original fluorescence regenerated (switch-on) upon addition of L-cysteine.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Biomass
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Carbon / chemistry
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Cysteine / chemistry
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Fluorescent Dyes / chemistry
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Gold / chemistry*
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Graphite / chemistry*
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Hydrogen Bonding
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Ions
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Luminescence
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Metals / chemistry
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Microscopy, Atomic Force
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Microscopy, Electron, Transmission
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Nanostructures / chemistry
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Photochemistry*
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Plant Leaves
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Porosity
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Quantum Dots*
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Spectrometry, Fluorescence*
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Spectrophotometry, Ultraviolet
Substances
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Fluorescent Dyes
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Ions
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Metals
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Carbon
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Gold
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Graphite
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Cysteine