SEMs of UITAR Graphene Paper

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A few peer-reviewers have suggested that UITAR graphene paper is amorphous carbon (a-C). However, the morphology of UITAR graphene strongly suggests otherwise.  The nearly flat and highly reflective surfaces (see the STM page), layered structure is not normally associated with a-C. See the photograph of a-C from this vendor. SEMs of a-C are available at this link. UITAR graphene has the layered characteristics observed with other investigator's graphene papers. These are produced by the various filtration techniques. Also when viewing the SEM of the literature examples below note how UITAR graphene paper is much smoother. We have noted that UITAR samples are smooth almost down to the atomic level by AFM. I believe that this may be due to the interwoven planes of graphene paper produced by filtration techniques giving a mottled surface texture. See figure 4 of Nature 2007, 448 , 457-460. UITAR graphene paper may lack this interwoven feature.

 Examples from Literature of the Layered Characteristics of Graphene Paper Produced by Filtration Methods.

• Advanced Materials 2008, 20, 3557-3561 figure 1
• Advanced Materials 2010, 22, 892-896 figure 5
• Chemical Communications 2010, 46, 2025-2027 figures 1 & 3
• Journal of Applied Physics 2011, 109,  014306 figure 1
• Energy and Environmental Science DOI: 10.1039/c0ee00640h figure 1

SEMs of UITAR Graphene Paper

Cross-sectional view indicating a layered morphology

A cleaved flake, note the very flat morphology.

Another view of UITAR graphene paper.