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以多壁碳纳米管(MWCNTs)为原料,经肽键形成氨基功能化后合成出新型多色荧光碳量子点(CQDs)。所制CQDs由准球形石墨纳米晶体(平均尺寸为10 nm)包裹不同烃类,如丙胺、辛胺、十二胺和八乙胺得到的氨基。在CQDs表面引入氮原子和烃类对其荧光性能、量子产率和溶解性起重要影响。这种新型有机-溶解CQDs的荧光发射波长取决于激发波长。荧光量子产率根据CQDs表面上烃类取代物的链长而变化。
Multi-walled carbon nanotubes (MWCNTs) were used as raw materials to synthesize novel multicolor fluorescent carbon quantum dots (CQDs) by amino-functionalization through peptide bond formation. The CQDs prepared by quasi-spherical graphite nanocrystals (average size of 10 nm) wrapped different hydrocarbons, such as propylamine, octylamine, dodecylamine and octaethylamine obtained amino. The introduction of nitrogen atoms and hydrocarbons on the surface of CQDs has an important impact on their fluorescence properties, quantum yield and solubility. The fluorescence emission wavelength of this new organic-soluble CQDs depends on the excitation wavelength. Fluorescence quantum yield varies depending on the chain length of hydrocarbon substituents on the surface of CQDs.