Raman spectroscopic evaluation of polyacrylonitrile-based carbon nanofibers prepared by electrospinning
Raman spectroscopic evaluation of polyacrylonitrile-based carbon nanofibers prepared by electrospinning
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DOI：
10.1002/jrs.1233
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发表时间：
2004-11-01
影响因子：
2.5
通讯作者：
Yang, KS
中科院分区：
文献类型：
--
作者：
Kim, C;Park, SH;Yang, KS
采用静电纺丝法将聚丙烯腈（PAN）的N，N-二甲基甲酰胺溶液纺成350 nm的超细纤维网。对网进行氧化稳定，然后在700- 1000 ℃范围内进行热处理。通过X射线衍射、场发射扫描电子显微镜、电导率和拉曼光谱对PAN基纳米碳纤维的微观结构进行了表征。L-c（002）和L-a（10）值分别为1.85-2.15和2.23-3.36 nm。当热处理温度从700 ℃升高到1000 ℃时，L-c（002）和L-a（10）值分别增加了约86%和66%。随着炭化温度的升高，聚丙烯腈纤维网的电导率也随之升高，在700 ℃和1000 ℃时分别为6.8 × 10 ~（-3）和1.96 S·cm ~（-1）。将来自拉曼散射的D和G带拟合到高斯-洛伦兹杂化函数中，并且从由G带的强度与D带的强度的比率确定的R值评估纳米纤维中的微晶尺寸。石墨层的畴尺寸在1.6-3.2 nm的范围内，在较高的HTT下具有较高的值。版权所有（C）2004约翰威利父子有限公司。
Poly(acrylonitrile) (PAN) solutions in N,N-dimethylformamide were electrospun into webs consisting of 350 nm ultra-fine fibers. The webs were oxidatively stabilized and followed by heat treatment in the range of 700-1000degreesC. Characterization of the microstructure of PAN-based carbon nanofibers was performed by x-ray diffraction, field-emission scanning electron microscopy, electrical conductivity and Raman spectroscopy. The L-c(002) and L-a(10) values were calculated to be 1.85-2.15 and 2.23-3.36 nm, respectively. The L-c(002) and L-a(10) values increased by about 86% and 66%, respectively, when the heat treatment temperature (HTT) was increased from 700 to 1000degreesC. The electrical conductivity of carbonized PAN nanofiber webs increased with increasing carbonization temperature, being 6.8 x 10(-3) and 1.96 S cm(-1) at 700 and 1000degreesC, respectively. The D and G bands from Raman scattering were fitted into a Gaussian - Lorentzian hybridized function, and the crystallite sizes in the nanofibers were evaluated from the R-values determined from the ratios of the intensity of the G band to that of the D band. The domain size of the graphitic layers was in the range 1.6-3.2 nm with higher values at higher HTT. Copyright (C) 2004 John Wiley Sons, Ltd.