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Solution plasma: new synthesis method of N-doped carbon dots as ultra-sensitive fluorescence detector for 2,4,6-trinitrophenol
Nano Express Pub Date : 2020-09-30 , DOI: 10.1088/2632-959x/abb9fa
Kyusung Kim 1 , Chayanaphat Chokradjaroen 2 , Nagahiro Saito 2, 3, 4, 5
Affiliation  

Herein, we report the synthesis of nitrogen-doped carbon dots (NCDs) through solution plasma (SP) for the first time. The SP method occurs a rapid dissociation of molecules, such as organic compounds, caused by an electrical discharge between electrodes immersed in a solution. The dissociation can result in the creation of various radicals such as C2, CN, and H which enable the rapid synthesis of carbon dots (CDs). The unique reaction of radicals allowed the formation of CDs with high N concentration and functionalization of the surface in a short time. In this study, by using the SP method, a very fine NCDs with size of 6 nm were synthesized from a pyridine/water mixture in just 10 min. Bright blue fluorescence (410 nm) with a high quantum yield (61%) was observed due to the high N concentration and the surface passivation. From the potential application point of view, the synthesized NCDs showed an excellent detection property for 2,4,6-trinitrophenol (TNP) by fluorescence quenching effect. It was due to rich amino-functional groups which act as a reaction pathway to TNP. This phenomenon was caused by the synergetic effect of a photo-induced electron transfer with the assistance of proton transfer-assisted electron transfer.



中文翻译:

溶液等离子体:作为 2,4,6-三硝基苯酚的超灵敏荧光检测器的 N 掺杂碳点的新合成方法

在此,我们首次报道了通过溶液等离子体 (SP) 合成掺氮碳点 (NCD)。SP 方法发生分子(例如有机化合物)的快速解离,这是由浸入溶液中的电极之间的放电引起的。解离可导致产生各种自由基,如 C 2、CN 和 H,它们能够快速合成碳点 (CD)。自由基的独特反应允许在短时间内形成具有高 N 浓度和表面功能化的 CD。在这项研究中,通过使用 SP 方法,在短短 10 分钟内从吡啶/水混合物合成了尺寸为 6 nm 的非常精细的 NCD。由于高 N 浓度和表面钝化,观察到具有高量子产率 (61%) 的亮蓝色荧光 (410 nm)。从潜在应用的角度来看,合成的 NCDs 通过荧光猝灭效应对 2,4,6-三硝基苯酚 (TNP) 显示出优异的检测性能。这是由于丰富的氨基官能团充当了 TNP 的反应途径。

更新日期:2020-09-30
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