常压辉光放电等离子体制备荧光碳纳米粒子

Preparation of Fluorescent Carbon Nanoparticles by Glow Discharge Plasma at Atmospheric Pressure

采用常压辉光放电等离子体制备了超细荧光碳纳米粒子。分别采用聚乙二醇(PEG)2000和聚乙烯吡咯烷酮(PVP)20000作为表面活性剂和表面修饰剂,利用辉光放电等离子体射流产生的大量高能电子等活性粒子分解乙醇溶液制备碳纳米粒子。采用透射电子显微镜和荧光分光光度计对生成物的形貌和荧光特性进行了检测。结果表明,生成物为石墨相的荧光碳纳米颗粒。随着反应时间的延长,生成物的荧光强度增强;采用PEG-2000修饰后产物的荧光强度比采用PVP-20000更强;丝状放电模式下生成物的荧光强度高于辉光放电模式。制备的碳纳米颗粒的荧光量子产率为46.58%。

Superfine fluorescent carbon nanoparticles were prepared by glow discharge plasma,which generated a large amout of active particles such as high-energy electrons to decompose ethanol,and then to initiate the free radical reactions for producing the carbon nanoparticles.Either polyethylene glycol（PEG） 2000 or polyvinylpyrrolidone（PVP） 20000 was used as surfactant or surface modifier for the ethanol.The fluorescent properties and morphology of the carbon nanoparticles were characterized by fluorescence spectrophotometer and transmission electron microscopy（TEM）,respectively.The results show that the morphology of fluorescent carbon nanoparticles is graphitic.The fluorescent intensities of the nanoparticles increase with reaction time,and they are higher in the resultants modified by PEG-2000 than by PVP-20000,as well as for those generated under streamer discharge mode than under glow discharge one.The quantum yield of photoluminescence is 46.58% for carbon nanoparticles prepared.