Fullerenes and CNTs Flashcards
Name the two principal fullerenes
C60 (Buckminsterfullerene // Bucky ball) and C70
Describe Buckminsterfullerene
60 Carbon atoms
Pentagon/Hexagonal C Rings
FCC structure
What structure does Buckminsterfullerene have?
FCC
What structure does Buckminsterfullerene have at T<255K?
Simple Cubic
What differentiates C60 and C70?
An extra layer of C atoms
How do fullerenes relate to CNTs?
The central layers of C atoms between the two hemispheres of a C60 buckyball represent a SWCNT
Describe a CNT in relation to graphene
A CNT is similar to a perfect Graphene layer that has been rolled up
Name the 3 types of CNT
Zig-Zag // Armchair // Chiral
How do Armchair/Zig-Zag CNTs differ from Chiral CNTs?
Armchair and Zig-Zag have C atoms arranged in a circumferential fashion around the CNT while chiral CNTs have a helical arrangement
What is the equation for the Chiral Vector, C
C = na1 + ma2
What are a1 and a2 in the chiral vector?
a1 and a2 are the unit cell base vectors of the graphene sheet which is rolled up
What are n and m in the chiral vector?
They are integers which describe the CNT → They dictate the diameter of the CNT
d=√((n+m)^2−nm)
To what axis is the chiral angle taken relative to?
The zig-zag line
Name the two MWCNT models
Russian Doll
Parchment
Explain the Russian Doll MWCNT model
Multiple different CNTs
Varying diameters
Largest diameter = Outermost
Concentric arrangement
