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Quantification of amorphous carbon and SWNT carboxylation: (a) TGA measurements of COOH-SWNTs either purchased commercially or carboxylated in-house via reflux in nitric acid and washed with 1.0 M NaOH; (b) bar plot displaying carboxyl group peak area, normalized in relation to sp2 C peak area in C 1s XPS spectra.
