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. 2014 Mar 13;4:4363. doi: 10.1038/srep04363

Figure 3.

Figure 3

(a,b) Comparative X-ray diffraction patterns and Raman spectra for pristine MWCNTs and MWCNTs samples hydrothermally treated with 0.5 M H2SO4, 0.5 M KOH, 0.5 M K2SO4, 0.5 M KNO3 at 180°C collected after subsequent washing with dil. HCl and water. Corresponding to K2SO4 treated MWCNTs samples annealed at 800°C. (c) Comparative XP spectra of C1s for MWCNTs and corresponding samples after hydrothermal treatment for 48 h with 0.5 M H2SO4, 0.5 M KOH, showing minimal percentage of sp3 carbon for 0.5 M K2SO4 and 0.5 M KNO3 treated samples. (d) Comparative Current –Voltage characteristics of pristine MWCNTs and corresponding samples after hydrothermal treatment for 48 h with 0.5 M H2SO4, 0.5 M KOH and showing improved conductivity for 0.5 M K2SO4 and 0.5 M KNO3 treated samples due GNRs formation; also the effect of annealing is displayed as an increase in the conductivity.