Biocompatible Carbon-Based Coating as Potential Endovascular Material for Stent Surface

Figure 3

Low-voltage FE-SEM field-emission scanning electron microscopy with energy filtering. Graphene layers visualized ((a) and (b)) versus uncoated steel ((c) and (d)) discs. Detectors used: In-Lens SE1 detector ((a) and (c)); EsB energy-filtered backscattered electrons detector ((b) and (d)). Incident beam acceleration voltage 800 V used throughout the imaging, retarding potential of EsB detector grid set at 760 V (40 eV filtering energy difference).

(a)

(b)

(c)

(d)