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首页> 外文期刊>RSC Advances >Novel single excitation dual-emission carbon dots for colorimetric and ratiometric fluorescent dual mode detection of Cu2+ and Al3+ ions
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Novel single excitation dual-emission carbon dots for colorimetric and ratiometric fluorescent dual mode detection of Cu2+ and Al3+ ions

机译：Cu2 +和Al3 +离子的比色和比例荧光双模检测的新型单励磁双发射碳点

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In this study, dual-emission carbon dots (D-CDs) are synthesized via a simple one-step solvothermal treatment of red tea. The obtained D-CDs are characterized by XPS, IR, TEM, XRD, fluorescence and UV-vis spectroscopy techniques. It is found that D-CDs present a strong red fluorescence emission peak at 671 nm and weak blue fluorescence emission peak at 478 nm under the excitation wavelength of 410 nm. The unique dual-emission properties of D-CDs provide great opportunities in ratiometric fluorescence sensing applications. The results show that Cu ~(2+) ions can quench the fluorescence of the red emission band of D-CDs effectively, resulting in the disappearance of red fluorescence ultimately. Upon the addition of Al ~(3+) ions, the fluorescence of blue emission band at 478 nm grows apparently, and the fluorescence color transforms gradually from red to orange, then to yellow-green. Based on these findings, a novel ratiometric fluorescence and colorimetric dual mode nanosensor is developed for simultaneous detection of Cu ~(2+) and Al ~(3+) ions. Regarding Cu ~(2+) ions, the fluorescent detection linear range is 0.1–50 μM with detection limit of 0.1 μM, and the colorimetric detection limit is estimated as 25 μM. With regard to Al ~(3+) ions, the fluorescent detection linear range is 0–20 μM and 25–100 μM with detection limit of 0.5 μM, and the colorimetric detection limit is 20 μM. Furthermore, the fluorescence response mechanisms of Cu ~(2+) and Al ~(3+) ions were discussed detailed. To the best of our current knowledge, this will be the first research work on the simultaneous determination of Cu ~(2+) and Al ~(3+) using D-CDs as fluorescent probes.
机译：在该研究中，通过对红茶的简单一步溶液处理合成双发射碳点（D-CD）。所得D-CD的特征在于XPS，IR，TEM，XRD，荧光和UV-VIS光谱技术。发现D-CD在478nm下在410nm的激发波长下在478nm处存在强烈的红色荧光发射峰值，并且在478nm处存在弱蓝荧光发射峰值。 D-CD的独特双排放特性提供了在比例荧光传感应用中的巨大机会。结果表明，Cu〜（2+）离子可以有效地淬灭D-CDS的红色发射带的荧光，导致红色荧光的消失最终。在添加Al〜（3+）离子后，蓝色发射带的荧光显然生长，荧光逐渐从红色转变为橙色，然后逐渐变换为黄绿色。基于这些发现，开发了一种新型比例荧光和比色双模纳米传感器，用于同时检测Cu〜（2+）和Al〜（3+）离子。关于Cu〜（2+）离子，荧光检测线性范围为0.1-50μm，检出限为0.1μm，比色度检测限估计为25μm。关于Al〜（3+）离子，荧光检测线性范围为0-20μm，25-100μm，检测限为0.5μm，比色检测限为20μm。此外，讨论了Cu〜（2+）和Al〜（3+）离子的荧光响应机制。据我们所知，这将是使用D-CD作为荧光探针同时测定Cu〜（2+）和Al〜（3+）的第一个研究。

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