Fig. 4 | Nature Communications

Fig. 4

From: Silicon as a ubiquitous contaminant in graphene derivatives with significant impact on device performance

Fig. 4

The extent of silicon contamination on the surface of typical low purity graphite (98% purity). a HAADF image of a typical graphite platelet. Details of the various boxed regions in a showing: b an iron contamination, c a clean area with a perfect graphitic lattice structure, and d a silicon contaminated area. eg EDS spectra of bd, respectively, showing iron contamination, clean graphene and silica contamination, respectively

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