Photoexcited State Properties of Carbon Dots from Thermally Induced Functionalization of Carbon Nanoparticles.
Photoexcited State Properties of Carbon Dots from Thermally Induced Functionalization of Carbon Nanoparticles.
复制标题
碳纳米粒子热诱导功能化产生的碳点的光激发态特性
DOI：
10.1039/c6tc03666j
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发表时间：
2016-11-28
期刊：
影响因子：
--
通讯作者：
Sun YP
中科院分区：
文献类型：
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作者：
Hu Y;Al Awak MM;Yang F;Yan S;Xiong Q;Wang P;Tang Y;Yang L;LeCroy GE;Hou X;Bunker CE;Xu L;Tomlinson N;Sun YP
碳点是具有多种表面钝化方案的小碳纳米颗粒，其中更有效的是对纳米颗粒进行化学功能化，以获得更明亮的荧光发射，但其合成方法较为繁琐，并且在功能化分子的选择上受到一定的限制。另一种比较流行的合成方法是有机物质的碳化，这种方法更有效和通用，但在合成和所需的点结构和性能方面的可控性较差。在这项工作中，结合两种合成方法的优点，采用混合方法制备聚乙烯亚胺（PEI）表面钝化的碳点，其中预处理和选择的小碳纳米颗粒在微波诱导的热反应中被PEI功能化。结果表明，制备的碳点与经过化学官能化处理的碳点具有相同的光激发态特征，包括相似的荧光颜色和其他性质。进一步证明了光激发态性质的相似性是基于pei -碳点与故意化学官能化的碳点中发现的相同的可见光激活杀菌功能。强调和讨论了混合方法的优点和潜在的局限性，以实现更可控、更通用和更高效的碳点合成。用混合方法制备的碳点具有光激发态特性和杀菌活性。
Carbon dots are small carbon nanoparticles with various surface passivation schemes, in which more effective has been the deliberate chemical functionalization of the nanoparticles for brighter fluorescence emissions, though the synthesis method is more tedious and subject to some limitations in the selection of functionalization molecules. Another more popular synthesis method has been the carbonization of organic species, with the method being more efficient and versatile, but less controllable in the synthesis and for the desired dot structure and performance. In this work, a hybrid approach combining the advantageous characteristics of the two synthesis methods was applied to the preparation of carbon dots with polyethyleneimine (PEI) for surface passivation, where pre-processed and selected small carbon nanoparticles were functionalized with PEI in microwave-induced thermal reactions. The optical absorption and fluorescence emission properties were evaluated, and the results suggested that the carbon dots thus prepared shared the same photoexcited state characteristics with those from the deliberate chemical functionalization, including comparable fluorescence colors and other properties. A further demonstration on the similarity in photoexcited state properties was based on the same visible light-activated bactericidal functions of the PEI-carbon dots as those found in carbon dots from the deliberate chemical functionalization. The advantages and potential limitations of the hybrid approach for more controllable yet versatile and efficient syntheses of carbon dots are highlighted and discussed. Carbon dots prepared by using a hybrid approach are demonstrated for photoexcited state properties and bactericidal activities.