Title of article :
Quality improvement of single-walled carbon nanotubes by doping B in Fe/MgO catalyst
Author/Authors :
Yunfang Liu، نويسنده , , Yan Pan، نويسنده , , Weidong Chi، نويسنده , , ZENGMIN SHEN?، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2011
Pages :
4
From page :
9403
To page :
9406
Abstract :
We demonstrate that the quality of the as-grown single-walled carbon nanotubes (SWCNTs) can be effectively improved by the addition of the B ingredient in the Fe/MgO catalyst. The as-grown SWCNTs were characterized by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM) and Raman spectroscopy. The SWCNTs prepared by the pure Fe/MgO catalyst have relatively low graphite crystallinity and are coated by much amorphous carbon. The intensity ratio of the D- and G-bands (ID/IG) in Raman spectra is relatively high (0.098 for laser 532 nm and 0.075 for laser 785 nm). The SWCNTs grown from the Fe/MgO catalyst doped with 0.1 part of B have more regular graphite structure with little amorphous carbon. The ID/IG values reduced remarkably (0.041 for laser 532 nm and 0.040 for laser 785 nm). The effect would be attributed to the inhibitory action of the doped B on the formation of radical hydrocarbon species for the formation of SWCNTs.
Keywords :
Raman spectroscopy , Single-walled carbon nanotube , Catalyst , electron microscopy
Journal title :
Applied Surface Science
Serial Year :
2011
Journal title :
Applied Surface Science
Record number :
1014894
Link To Document :
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