首页|Carbon dots based multicolor fluorescence sensor for ratiometric and colorimetric dual-model detection of Cu2+
Carbon dots based multicolor fluorescence sensor for ratiometric and colorimetric dual-model detection of Cu2+
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NSTL
Elsevier
Herein, a multicolor fluorescence sensor with two emission peaks at 445 nm (F445) and 560 nm (F560) under excitation wavelength of 365 nm was facilely fabricated by hybridizing blue and yellow fluorescence carbon dots (B-CDs and Y-CDs). Cu2+ could selectively coordinate with the aromatic amino groups of the Y-CDs, thus forming the Cu2+-Y-CDs complex through electron pair sharing to efficiently quench the fluorescence of B-CDs by Fo center dot rster resonance energy transfer. Meanwhile, the complex could suppress photoinduced electron transfer thus enhancing the fluorescence of Y-CDs. The unique interrelated opposite responses of the sensor toward Cu2+ could generate a remarkable change in the value of F560/F445 and consequently give rise to more easily distinguishable fluorescent color tonality changes from blue to yellow for colorimetric detection. The sensor possessed a low detection limit of 44.05 nmol L-1 and 169.46 nmol L-1 to recognize Cu2+ by the ratiometric fluorescent and colorimetric detection, respectively. Recoveries of 96.8-105.9% (RSD <3.8%) and 94.4-108.5% (RSD <7.7%) were respectively obtained in spiked samples by the ratiometric fluorescent and colorimetric detection, indicating their promising potentials to quick pre-warning of Cu2+ for ensuring food safety and improving public health.
NSTL
Elsevier
