Research Article

Characterization of Multiwalled Carbon Nanotubes Dispersing in Water and Association with Biological Effects

Figure 4

Surface chemistry of oxidized MWCNTs dispersed in the aqueous solution. (a) XPS spectra of l-MWCNT-O4. (b) Relative amount of various oxygen species. (c) FTIR of l-MWCNTs with different oxidation degrees.
938491.fig.004a
(a)
938491.fig.004b
(b)
938491.fig.004c
(c)