Abstract

Carbon dots (CDs) are class of carbon based nanomaterials with excellent optical properties. However, in solid state the fluorescence of CDs is not observed due to aggregation-caused quenching effect. Herein, we present a facile thermal method for preparing solid state yellow emissive nitrogen doped carbon dots (N-CDs) using organic solvents, ethanolamine and acrylonitrile as the precursors without further surface passivation. In addition, N-CDs aqueous dispersion exhibits tunable blue to green emission, while acetone dispersion show yellow emission. Moreover, the aqueous dispersion of N-CDs is employed for detecting picric acid selectively by fluorescence quenching mode based on inner filter effect. A good linearity is observed in the range from 0 to 45 μM, with a detection limit of 1.17 μM. The method is successfully applied for determination of picric acid in environmental samples.

Graphic Abstract

中文翻译：

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一锅多色发射氮掺杂碳点的合成及其在丙酮和苦味酸传感器中的应用

摘要

碳点（CD）是具有出色光学特性的碳基纳米材料。但是，在固态下，由于聚集引起的猝灭作用，未观察到CD的荧光。在这里，我们提出了一种简便的热方法，无需有机表面钝化即可使用有机溶剂，乙醇胺和丙烯腈作为前体制备固态的黄色发射氮掺杂碳点（N-CD）。另外，N-CDs水分散体显示出可调的蓝色至绿色发射，而丙酮分散体显示出黄色发射。此外，N-CDs的水分散体被用于基于内部滤光效应通过荧光猝灭模式选择性地检测苦味酸。在0至45μM的范围内观察到良好的线性，检出限为1.17μM。

图形摘要