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Abstract：
A facile, economical and green strategy to prepare green-fluorescent nitrogen-doped carbon nanodots (N-CDs) with a quantum yield (QY) of approximately 31.91% has been built up, while aspartame was employed as the carbon-nitrogen source for the first time. The prepared N-CDs exhibited ultrahigh brightness, favorable strong photostability and negligible cytotoxicity. The outstanding optical properties are mainly derived from the their robost composition and steric distribution of the doped nitrogen atoms, which have been characterized detailedly. The obtained N-CDs showed highly selective and sensitive response toward ferric ions (Fe3+) through a fluorescence static quenching process in a wide linear range of 0.005-60µmol/L. The detection limit was as low as 1.43nmol/L, allowing the analysis of Fe3+ in a very simple method. The excitation-dependent luminescent behavior of the obtained N-CDs guaranteed the multicolor emissive property when they were used in cell imaging. And the application for intracellular Fe3+ sensing further verified this novel N-CDs may open more opportunities in biosensor, bioimaging and biological assay.
摘要：
一个容易的，已经建立了制备量子产率（QY）约为31.91％的绿色荧光氮掺杂碳纳米点（N-CD）的经济和绿色策略，而阿斯巴甜首次被用作碳氮源。制备的N-CD显示出超高亮度，有利的强的光稳定性和可忽略的细胞毒性。突出的光学性质主要来自于它们的机器人组成和掺杂氮原子的空间分布,它们被详细地描述了。通过在0.005-60µmol/L的宽线性范围内的荧光静态猝灭过程，获得的N-CD对三价铁离子（Fe3）显示出高度选择性和灵敏的响应。检出限低至1.43nmol/L,允许以非常简单的方法分析Fe3+。获得的N-CD的激发依赖性发光行为在用于细胞成像时保证了多色发射特性。并应用于细胞内Fe3+传感进一步验证了这一新型N-CD在生物传感器中可以或许开辟更多的机会,生物成像和生物测定。
