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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 Cu2+ 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 Al3+ 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 Cu2+ and Al3+ ions. Regarding Cu2+ ions, the fluorescent detection linear range is 0.1-50 mu M with detection limit of 0.1 mu M, and the colorimetric detection limit is estimated as 25 mu M. With regard to Al3+ ions, the fluorescent detection linear range is 0-20 mu M and 25-100 mu M with detection limit of 0.5 mu M, and the colorimetric detection limit is 20 mu M. Furthermore, the fluorescence response mechanisms of Cu2+ and Al3+ ions were discussed detailed. To the best of our current knowledge, this will be the first research work on the simultaneous determination of Cu2+ and Al3+ 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，Cu2 +离子可以有效地抑制D-CDS的红色发射带的荧光，从而最终导致红色荧光的消失。加入Al3 +离子后，478nm的蓝色发射带的荧光显然生长，并且荧光颜色从红色转化为橙色，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Al3 +离子。关于Cu2 +离子，荧光检测线性范围为0.1-50μm，检测极限为0.1μm，并且比色检测限估计为25μm。关于Al3 +离子，荧光检测线性范围是0-20 Mu M和25-100 mu m具有0.5μm的检出限，比色检测限为20μm。此外，讨论了Cu2 +和Al3 +离子的荧光响应机制。详细讨论。据我们所知，这将是使用D-CD作为荧光探针同时测定Cu2 +和Al3 +的第一研究工作。

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    《RSC Advances》 |2019年第66期|共8页
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  • 正文语种 eng
  • 中图分类 化学;
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