Fig. 3: Photograph of the fabricated DLC-UME and SEM images of the surface coatings on the UME tips.

a Photograph of the fabricated DLC-UME. b SEM image of the UME tip before deposition of DLC coating. c Magnified SEM image of IrOx coating on the surface of the UME tip in the red box in b. d SEM image of cross-section of surface coatings on the UME tip. e SEM image of the UME tip after deposition of DLC coating. f Magnified SEM image of DLC coating on the surface of the UME tip in the red box in e