Fig. 2From: A simple strategy based on fibers coated with surfactant-functionalized multiwalled carbon nanotubes to improve the properties of solid-phase microextraction of phenols in aqueous solutionTEM image of the original MWCNTs (a), TEM image of the modified MWCNTs after processing with NaDC (b), and SEM image of the MWCNTs/NaDC coating surface of the silica fiber (c, d)Back to article page