The Impact of Sonication on the Surface Quality of Single-Walled Carbon Nanotubes.

Abstract:

:Sonication process is regularly adopted for dispersing single-walled carbon nanotubes (SWCNTs) in an aqueous medium. This can be achieved by either covalent functionalization of SWCNTs with strong acid or by noncovalent functionalization using dispersants that adsorb onto the surface of SWCNTs during dispersion. Because the dispersion process is usually performed using sonication, unintentional free radical formation during sonication process may induce covalent modification of SWCNT surface. Herein, we have systematically investigated the status of SWCNT surface modification under various sonication conditions using Raman spectroscopy. Comparing ID /IG (Raman intensities between D and G bands) ratio of SWCNTs under various sonication conditions suggests that typical sonication conditions (1-6 h bath sonication with sonication power between 3 and 80 W) in aqueous media do not induce covalent modification of SWCNT surface. In addition, we confirm that SWCNT dispersion with single-stranded DNA (ssDNA) involves noncovalent adsorption of ssDNA onto the surface of SWCNTs, but not covalent linkage between ssDNA and SWCNT surface.

journal_name

J Pharm Sci

authors

Koh B,Cheng W

doi

10.1002/jps.24483

subject

Has Abstract

pub_date

2015-08-01 00:00:00

pages

2594-9

issue

8

eissn

0022-3549

issn

1520-6017

pii

S0022-3549(15)30002-2

journal_volume

104

pub_type

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