In reported that to have higher conductivity

In a paper by Wallace,
it shown that volume resistivity of graphite is the range 4 x 10-5 ?m
to 6 x10-5 ?m (Wallace, 1947). Since graphite
has some similarity with MWCNT in term of numerous layer, the result can be
compared with study conducted by Stetter et.al, which has intershell spacing
between 0.39 to 0.34 nm. The result obtained at room temperature is 0.068 ?m,
with diameter of 33 nm (Stetter et al., 2010). While a study
conducted by Bourbon et. al, found that conductance of MWCNT is independent to
temperature with volume resistivity in the range of 0.34 ?m-1.8 ?m (Bourlon, Miko, Forró, Glattli, and Bachtold, 2004). Contrary,
study by Stetter found that, resistivity increases as temperature decrease. In
agreement with this findings is study by Ebbesen which shows sudden increases
in resistance as temperature decrease. (Ebbesen, T. W., Lezec H. J., Hiura H., Bennett J. W.,
Ghaemi H. F, 1996). The stated
findings is based on measurement on individual carbon nanotube. This result
indicate that, generally, conductivity is decrease at lower than room
temperature and increase at higher temperature.   

 

            From
various experimental results, generally, CNT fiber synthesized from direct
spinning process has higher electrical conductivity than CNT fiber from wet
spinning but lower conductivity of CNT fiber from array. (Jingdong, 2015). Contrary, CNT
yarn which a part CNT fiber reported that to have higher conductivity in direct
spinning process compared to CNT yarn spun from array and CNT yarn spun from
wet spinning, which has conductivity of 
5 x 105 S/m(Zhong et al., 2010) (1.7-4.1) x 104
S/m (Zhang et al., 2007), (1-2) x 103
S/m(Vigolo, Vigolo, Pe, & Coulon, 2013) respectively. This
comparison shows that, direct spinning process provides better result in
electrical conductivity owing to conductivity of CNT bundles during synthesized
itself.

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