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Issue 80, 2016
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Carbon nitride quantum dot-based chemiluminescence resonance energy transfer for iodide ion sensing

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Abstract

In this study, a dramatically enhanced chemiluminescence (CL) was observed in Ce(IV) and sulfite system in the presence of graphitic carbon nitride quantum dots (g-CNQDs). On the basis of CL spectra, UV-vis absorption, fluorescence (FL), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) and the effect of various free radical scavengers, a possible CL mechanism of radiative recombination of the holes-injected and electrons-injected g-CNQDs was suggested to account for the surprising g-CNQD CL behavior. Meanwhile, the excited sulfur dioxide molecules Image ID:c6ra15509j-t1.gif, produced from the interaction between Ce(IV) and sulfite under acidic conditions, could transfer energy to g-CNQDs and further enhance the CL emission. In addition, the CL was dependent on the FL quantum yields of g-CNQDs with different surface states, since the chemiluminescence resonance energy transfer (CRET) efficiency was affected by the FL quantum yields of the g-CNQDs. The designed CL system was successfully applied to determine Iāˆ’ in urine samples with good recoveries. It is anticipated that g-CNQDs could be a new class of CRET receptors for fabricating CL sensors. These findings would provide new insight into the optical properties of g-CNQDs and further broaden their applications in CL fields.

Graphical abstract: Carbon nitride quantum dot-based chemiluminescence resonance energy transfer for iodide ion sensing

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Publication details

The article was received on 15 Jun 2016, accepted on 02 Aug 2016 and first published on 09 Aug 2016


Article type: Paper
DOI: 10.1039/C6RA15509J
Citation: RSC Adv., 2016,6, 76890-76896
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    Carbon nitride quantum dot-based chemiluminescence resonance energy transfer for iodide ion sensing

    X. Fan, Y. Su, D. Deng and Y. Lv, RSC Adv., 2016, 6, 76890
    DOI: 10.1039/C6RA15509J

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