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(A) FT-IR spectra of: SWNTs (a), SWNT–SnDPP (b) and Sn(OH)2DPP (c). All IR samples are prepared as pellets by using spectroscopic grade KBr at room temperature. (B) Raman spectra of SWNTs (a) SWNT–SnDPP after TGA treatment in nitrogen, 5 °C/min (b) and SWNT–SnDPP (c). Raman spectra are measured at room temperature with the 514.5 nm line of an Ar ion laser as the excitation source.
