Polyol-Mediated Synthesis of Nitrogen-Containing Carbon-Dots from Tetracyanobenzene with Intense Red Fluorescence
Polyol-Mediated Synthesis of Nitrogen-Containing Carbon-Dots from Tetracyanobenzene with Intense Red Fluorescence
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DOI：
10.3390/nano9101470
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发表时间：
2019-10-01
期刊：
影响因子：
5.3
通讯作者：
Feldmann, Claus
中科院分区：
文献类型：
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作者：
Lehmacher, Roman;Feldmann, Claus
通过加热（160 ℃，1小时）聚乙二醇400（PEG 400）中的1，2，4，5-四氰基苯（TCB）来制备含氮C点。所制备的单晶C-点直径为2-4 nm，含有24.4重量%的氮。它们在400-500 nm激发下以及在600-700 nm激发下显示出强烈的荧光。除了在400至650 nm处的激发波长依赖性发射之外，发射光谱在715 nm处表现出强发射峰，其位置与激发波长无关。对于这种深红色发射，检测到69%的显着量子产率。含氮碳点的合成完全在液相中进行。此外，C点可以直接分散在水中。所得的PEG 400稳定的含氮C点的水性悬浮液也显示出肉眼可见的强烈红色发射。
Nitrogen-containing C-dots were prepared by heating (160 degrees C, 1 h) 1,2,4,5-tetracyanobenzene (TCB) in polyethylene glycol 400 (PEG400). The as-prepared monocrystalline C-dots were 2-4 nm in diameter and contained 24.4 wt.% of nitrogen. They showed intense fluorescence under excitation at 400-500 nm as well as under excitation at 600-700 nm. In addition to an excitation-wavelength-depending emission at 400 to 650 nm, the emission spectra exhibited a strong emission peaking at 715 nm, whose position was independent from the wavelength of excitation. For this deep-red emission a remarkable quantum yield of 69% was detected. The synthesis of nitrogen-containing C-dotswas completely performed in the liquid phase. Moreover, the C-dots could be directly dispersed in water. The resulting aqueous suspensions of PEG400-stabilized nitrogen-containing C-dots also showed intense red emission that was visible to the naked eye.