聚丙烯腈基炭纳米球的制备

PREPARATION OF POLYACRYLONITRILE-BASED CARBON NANOSPHERES

采用低浓度水相分散聚合的方法合成了粒径在230 nm^250 nm的聚丙烯腈球,对其依次经过冷冻干燥、氧化及炭化工艺,用扫描电镜对炭化后的样品形貌进行了观察.结果表明,聚丙烯腈球炭化后转化为粒径在170 nm^190 nm之间的炭纳米球.炭纳米球经1500℃,2300℃及2800℃的高温处理后,X射线衍射仪分析表明,在2300℃处理温度以上可以得到石墨化度明显增加的炭纳米球.

Polyacrylonitrile（PAN） nanospheres latex with an average diameter size between 230 nm and 250 nm was synthesized by dispersion polymerization. After freeze drying, the PAN particles were stabilized in air at 250 ℃ and then carbonized in nitrogen at 1 000 ℃. Scanning electron microscopy study showed that all PAN nanospheres were carbonized to carbon nanospheres with the diameter range of 170 nm-190 nm. The carbon nanospheres were also treated at 1 500 ℃, 2 300℃ and 2 800℃ respectively. X-ray diffraction study showed that above 2 300 ℃ the graphitization degree of the samples appeared a distinct increase.