Figure 3.

SEM images of pristine and PEI-functionalized carbon nanotubes. The surface morphology of pristine SWNTs (A) and MWNTs (C) was compared with that of PEI-NH-SWNTs (B) and PEI-NH-MWNTs (D) by a JSM-6500F SEM. Bar 100 nm.

Huang et al. Nanoscale Research Letters 2013 8:267   doi:10.1186/1556-276X-8-267
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