Abstract
In this study, we report an oxidative treatment of multiwalled carbon
nanotubes (MWCNTs) by using nitric acid at different temperatures
(25-175 degrees C). The analyzed materials have diameters varying from
10 to 40 nm and majority lengths between 3 and 6 mu m. The
characterization results obtained by different techniques (e. g., field
emission scanning electron microscopy, thermogravimetric analysis,
energy-filtered transmission electron microscopy, Braunauer, Emmet and
Teller method, zeta-potential and confocal Raman spectroscopy) allowed
us to access the effects of temperature treatment on the relevant
physico-chemical properties of the MWCNTs samples studied in view of an
integrated perspective to use these samples in a bio-toxicological
context. Analytical microbalance measurements were used to access the
purity of samples (metallic residue) after thermogravimetric analysis.
Confocal Raman spectroscopy measurements were used to evaluate the
density of structural defects created on the surface of the tubes due to
the oxidation process by using 2D Raman image. Finally, we have
demonstrated that temperature is an important parameter in the
generation of oxidation debris (a byproduct which has not been properly
taken into account in the literature) in the industrial grade MWCNTs
studied after nitric acid purification and functionalization.
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