Table 1

Sample codes

S. no.

Amount of MWCNTs

Chemical route

followed

Dispersion before functionalization

Functional groups

attached

Sample

code

1

40 mg

Double-step functionalization

No

-COOH

-SO₃H

FPCNT01

2

50 mg

Double-step functionalization

Yes

-COOH

- SO₃H

DFCNT03

3

50 mg

Single-step functionalization

Yes

-COOH

FCNT03

4

20 mg

Single-step functionalization

No

-COOH

-PO₃H₂

PhCNT01

Kumar et al. Nanoscale Research Letters 2011 6:583   doi:10.1186/1556-276X-6-583