超支化聚乙烯亚胺改性荧光碳点材料的制备和表征
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摘要
以超支化聚乙烯亚胺(PEI)和柠檬酸(CA)为原料,采用水热合成法制备了荧光碳点,通过PEI表面改性的方法,大大提高了碳点的荧光量子产率。考察了制备过程中的原料用量、反应时间、反应温度等条件对荧光碳点荧光强度的影响,优化了荧光碳点的制备过程,在最适宜实验条件下得到了荧光量子产率为43%荧光碳点。此外,还考察了溶液pH值、离子强度、紫外曝光等因素对碳点荧光稳定性的影响,采用紫外可见光谱法、荧光光谱法和透射电镜对荧光碳点进行了表征。
Hyperbranched polyethyleneimine(PEI) and citric acid(CA) were used to prepare fluorescent carbon dots by a hydrothermal synthesis method. It was experimentally demonstrated that the fluorescent intensity of carbon dots was greatly improved by PEI surface modification. The effects of dosage, temperature and reaction time on the fluorescence of carbon dots were investigated. Under the optimal experimental conditions, the fluorescent quantum yield of 43% was achieved. In addition, the fluorescent carbon dots were characterized by UV-vis spectroscopy, fluorescent spectroscopy and transmission electron microscopy.
Hyperbranched polyethyleneimine(PEI) and citric acid(CA) were used to prepare fluorescent carbon dots by a hydrothermal synthesis method. It was experimentally demonstrated that the fluorescent intensity of carbon dots was greatly improved by PEI surface modification. The effects of dosage, temperature and reaction time on the fluorescence of carbon dots were investigated. Under the optimal experimental conditions, the fluorescent quantum yield of 43% was achieved. In addition, the fluorescent carbon dots were characterized by UV-vis spectroscopy, fluorescent spectroscopy and transmission electron microscopy.
引文
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[6] Wang Y,Hu A.Carbon quantum dots:Synthesis,properties and applications[J].Journal of Materials Chemistry C,2014,2(34):6 921-6 939
[7] Zheng X,Ananthanarayanan A,Luo K,et al.Glowing graphene quantum dots and carbon dots:Properties,syntheses,and biological applications[J].Small,2015,11(14):1 620-1 636
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[11] Sun Y,Zhou B,Lin Y,et al.Quantum-Sized carbon dots for bright and colorful photoluminescence[J].Journal of the American Chemical Society,2006,128(24):7 756-7 757
[12] Xu X,Ray R,Gu Y,et al.Electrophoretic analysis and purification of fluorescent single-walled carbon nanotube fragments[J].Journal of the American Chemical Society,2004,126(40):12 736-12 737
[13] Lu J,Yang J,Wang J,et al.One-Pot synthesis of fluorescent carbon nanoribbons,nanoparticles,and graphene by the exfoliation of graphite in ionic liquids[J].ACS Nano,2009,3(8):2 367-2 375
[14] Cunningham G,Panich A M,Shames A I,et al.Ozone-modified detonation nanodiamonds[J].Diamond and Related Materials,2008,17(4/5):650-654
[15] Zhai Y,Dou Y,Liu X,et al.Soft-Template synthesis of ordered mesoporous carbon/nanoparticle nickel composites with a high surface area[J].Carbon,2011,49(2):545-555
[16] Zhu H,Wang X,Li Y,et al.Microwave synthesis of fluorescent carbon nanoparticles with electrochemiluminescence properties[J].Chemical Communications,2009,(34):5 118-5 120
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[19] Huang H,Lv J,Zhou D,et al.One-Pot green synthesis of nitrogen-doped carbon nanoparticles as fluorescent probes for mercury ions[J].RSC Advances,2013,3(44):2 1691-21 696
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[24] Zhou M,Zhou Z,Gong A,et al.Synthesis of highly photoluminescent carbon dots via citric acid and Tris for iron(III) ions sensors and bioimaging[J].Talanta,2015,143:107-113