Figure 4.

FTIR spectra of pristine and PEI-functionalized carbon nanotubes. Pristine and PEI-functionalized carbon nanotubes were analyzed by a PerkinElmer Spectrum 100 FTIR spectrometer, and the spectra were compared with that of pure PEI.

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