Chemistry Reference
In-Depth Information
arc-discharge method is its use in doping graphene with boron and
nitrogen [41]. Boron and nitrogen doped graphene (B-HG and N-HG)
have been obtained by carrying out the discharge in the presence of
H
2
+diborane and H
2
+ (pyridine or ammonia) respectively. In spite of the
many advances made in the last four years, controlled synthesis with
desired number of layers remains a challenge.
Fig. 5. (a) TEM and (b) AFM images of HG, prepared by arc discharge of graphite in
Hydrogen (From reference 6).
3. FUNCTIONALIZATION AND SOLUBILIZATION
Carbon nanotubes (CNTs) have been functionalized by both covalent and
non-covalent means in order to disperse or solubilize them in different
solvents [42-43]. Functionalization of graphene has been carried out by
employing similar strategies [4-5]. For example, by employing covalent
modification, Haddon and co-workers have achieved functionalization of
graphene by several methods. Acid-treated graphene containing surface
-OH and -COOH groups was first reacted with SOCl
2
to create -COCl
groups, followed by reaction with a long chain aliphatic amine to obtain
the amide derivative soluble in nonpolar solvents [44]. Another method
