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The synthesis of carbon nanotubes￡¨CNTs ￡(c)at low temperature has received a gre at deal of attention and be-comes a challenging issue￡(r)But few mo del which accounts for the growth of C NTs is suited for the synthesis of CNTs by microwave plasma chemical vapor deposition￡¨MWPCVD￡(c)at low temperature because most rese archers conclude that the growth mechanism is determi ned by the catalyst-supporter interaction while ignored the diffusion o f carbon in the catalyst￡(r)In this paper,under the catalytic effect of cobalt supported by SiO 2 and Al 2 O 3 ,CNTs are synthe-sized by MWPCVD at about 500℃,and tip-growth,the model which accounts fo r the catalytic growth of CNTs is outlined￡(r)It is the temperature difference between the upper and bottom o f the catalytic particle that results in the diffusion of carbon atoms from upper to the bottom,and precipitation of s aturated carbon on the bottom surface to form CNTs￡(r)
The synthesis of carbon nanotubes £ ¨CNTs £ (c) at low temperature has received a gre at deal of attention and be-comes a challenging issue £ (r) But few mo del which accounts for the growth of C NTs is suited for the synthesis of CNTs by microwave plasma chemical vapor deposition £ ¨MWPCVD £ (c) at low temperature because most rese archers conclude that the growth mechanism is determi ned by the catalyst-supporter interaction while ignored the diffusion of carbon in the catalyst £ (r) In this paper, under the catalytic effect of cobalt supported by SiO 2 and Al 2 O 3, CNTs are synthe-sized by MWPCVD at about 500 ° C., and tip-growth, the model which accounts fo the catalytic growth of CNTs is outlined (R) It is the temperature difference between the upper and bottom of the catalytic particle that results in the diffusion of carbon atoms from upper to the bottom, and precipitation of s aturated carbon on the bottom surface to form CNTs £ (r)