Cytotoxicity of Protein-Carbon Nanotubes on J774 Macrophages Is a Functionalization Grade-Dependent Effect

Figure 1

Raman spectra of different CNTs. Raman spectra obtained from P-CNTs (a), P46P-CNTs (b), and P46S-CNTs (c). Each figure shows the D band at 1330 cm⁻¹, the G-band at 1600 cm⁻¹, and the G′ band at 2650 cm⁻¹ (laser excitation 632.8 nm).

(a) P-CNTs

(b) P46P-CNTs (precipitate)

(c) P46S-CNTs (supernatant)