Determination of Metal Impurities in Carbon Nanotubes Sampled Using Surface Wipes

Figure 2

(a) Plot of metal concentrations in all three CNTs (NIST 2483, Test, and Aldrich) measured by ICP-MS and ICP-OES after microwave digestion (MD). (b) Plot of metal concentrations in spiked Aldrich-CNT 10 and 100 times diluted MD digests measured by ICP-MS. The straight line represents the best fit linear regression from (a) seven and (b) four pairs of concentration values (mean of five independent determinations).

(a)

(b)