Stable Carbon Dots from Microwave-Heated Carbon Nanoparticles Generating Organic Radicals for In Situ Additions
Stable Carbon Dots from Microwave-Heated Carbon Nanoparticles Generating Organic Radicals for In Situ Additions
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DOI：
10.3390/c9010005
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发表时间：
2022-12
期刊：
影响因子：
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通讯作者：
Weixiong Liang;Buta Singh;Elton Y. Cao;C. Bunker;W. Cannon;L. Petta;Ping Wang;Liju Yang;Li Cao;Annalise Scorzari;Ya-Ping Sun
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文献类型：
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作者：
Weixiong Liang;Buta Singh;Elton Y. Cao;C. Bunker;W. Cannon;L. Petta;Ping Wang;Liju Yang;Li Cao;Annalise Scorzari;Ya-Ping Sun
碳点（CDots）是一种具有有效表面钝化作用的小碳纳米颗粒。本研究通过n -乙基咔唑（NEC）自由基加成实现了小碳纳米颗粒与n -乙基咔唑（NEC）的表面功能化。由于碳纳米粒子与NEC等有机物质在微波吸收方面的主要差异，可以通过微波辐射选择性加热纳米粒子，使NEC中的氢提取产生NEC自由基，然后将自由基原位添加到纳米粒子上。通过显微镜和光谱技术（包括定量质子和13C NMR方法）对所得的NEC-CDots进行了表征。发现该点样品的光学光谱性质与其他有机功能化方案的CDots基本相同。着重讨论了自由基加成功能化对NEC-CDots结构稳定性的影响。
Carbon dots (CDots) are small carbon nanoparticles with effective surface passivation by organic functionalization. In the reported work, the surface functionalization of preexisting small carbon nanoparticles with N-ethylcarbazole (NEC) was achieved by the NEC radical addition. Due to the major difference in microwave absorption between the carbon nanoparticles and organic species such as NEC, the nanoparticles could be selectively heated via microwave irradiation to enable the hydrogen abstraction in NEC to generate NEC radicals, followed by in situ additions of the radicals to the nanoparticles. The resulting NEC-CDots were characterized by microscopy and spectroscopy techniques including quantitative proton and 13C NMR methods. The optical spectroscopic properties of the dot sample were found to be largely the same as those of CDots from other organic functionalization schemes. The high structural stability of NEC-CDots benefiting from the radical addition functionalization is highlighted and discussed.