Upconversion photoluminescent metal ion sensors via two photon absorption in graphene oxide quantum dots

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In-depth study on upconversion photoluminescence (UCPL) of graphene oxide quantum dots (GOQDs) was presented. Uniform GOQDs with a single-layer and a circular shape within 4 nm diameter were fabricated by acidic exfoliation from the graphite nanoparticles. The green UCPL of the GOQDs at similar to 563 nm was observed by a femto-second (fs) Ti:sapphire pulsed laser (lambda(ex):800 nm), and the mechanism of the observed UCPL was systemically characterized. We further utilized the UCPL of GOQD as an optical biosensor for detecting aptamer-based metal ions with high sensitivity and selectivity, and verified that the fluorescence quenching of the UCPL GOQDs was mediated by the electron transfer between the GOQD and the captured metal ion rather than fluorescence energy transfer. The understanding of the UCPL of graphene quantum dots would enhance their applicability in the biosensing and bioimaging research fields. (C) 2014 Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2015-01
Language
English
Article Type
Article
Keywords

ENERGY-TRANSFER; VISIBLE-LIGHT; ANTI-STOKES; IN-VIVO; LUMINESCENCE; SIZE; NANOPARTICLES; NANOCRYSTALS; FLUORESCENCE; TEMPERATURE

Citation

CARBON, v.81, pp.367 - 375

ISSN
0008-6223
DOI
10.1016/j.carbon.2014.09.069
URI
http://hdl.handle.net/10203/195438
Appears in Collection
PH-Journal Papers(저널논문)CBE-Journal Papers(저널논문)
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