Carbon Nanotubes: A Review on Structure and Their Interaction with Proteins
Table 1
Comparison between SWCNT and MWCNT.
SWCNT
MWCNT
Single layer of graphene.
Multiple layer of graphene
Catalyst is required for synthesis.
Can be produced without catalyst.
Bulk synthesis is difficult as it requires proper control over growth and atmospheric condition.
Bulk synthesis is easy.
Not fully dispersed, and form bundled structures.
Homogeneously dispersed with no apparent bundled formation.
Resistivity usually in the range of 10−4–10−3 Ω·m.
Resistivity usually in the range of 1.8 × 10−5–6.1 × 10−5 Ω·m
Purity is poor. TypicalSWCNTcontent in as-prepared samples by chemical vapour deposition (CVD) method is about 30–50 wt%. However high purity up to 80% has been reported by using arc discharge synthesis method.
Purity is high. Typical MWCNT content in as-prepared samples by CVD method is about 35–90 wt%.
A chance of defect is more during functionalization.
A chance of defect is less especially when synthesized by arc-discharged method.
