Figure 6.

A contour plot of the potential energy of a H-atom. In vicinity of the two adjacent carbon bonding centers (C) in graphene, Z being the direction orthogonal to the graphene. The depths of the wells in which hydrogen bonds are equal.

Ehemann et al. Nanoscale Research Letters 2012 7:198   doi:10.1186/1556-276X-7-198
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