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Synthesis of N-doped Carbon dots via a microplasma process
Chemical Engineering Science ( IF 4.7 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.ces.2020.115648
Xintong Ma , Sirui Li , Volker Hessel , Liangliang Lin , Stefan Meskers , Fausto Gallucci

Abstract In this study, an effective approach was presented for the synthesis of N-doped carbon dots via a microplasma-assisted process at atmospheric pressure. The effects of operation parameters on the surface groups and photoluminescence (PL) property of carbon dots were studied in detail. Nitrogen element was successfully doped as N H group and pyrrolic–like structure in the carbon dots. The morphology, structures, chemical compositions and photoluminescence properties of N-doped carbon dots were systematically characterized. The generated chemical species and mechanism were monitored and studied by optical emission spectroscopy. The synthesized particles owned excitation-dependent emission property with a quantum yield up to 9.90%. The plasma treatment time and operating voltage affect the carbonization degree, doping state of nitrogen and particle size, resulting in different PL behaviours. The variation of electrode sizes has slight effects on the yield of N-doped carbon dots from 0.31% to 0.42% owing to the differences in electron density.

中文翻译:

通过微等离子体工艺合成 N 掺杂的碳点

摘要 在这项研究中,提出了一种在大气压下通过微等离子体辅助工艺合成 N 掺杂碳点的有效方法。详细研究了操作参数对碳点表面基团和光致发光(PL)性能的影响。氮元素被成功地掺杂为 NH 基团和类吡咯结构的碳点。系统地表征了N掺杂碳点的形貌、结构、化学成分和光致发光特性。通过光学发射光谱监测和研究产生的化学物质和机制。合成的粒子具有激发依赖的发射特性,量子产率高达9.90%。等离子处理时间和工作电压影响碳化程度,氮的掺杂状态和粒径,导致不同的 PL 行为。由于电子密度的差异,电极尺寸的变化对 N 掺杂碳点的产率有轻微影响,从 0.31% 到 0.42%。
更新日期:2020-07-01
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