Graphene-based armor could stop bullets by becoming harder than diamonds - scientists have determined that two layers of stacked graphene can harden to a diamond-like consistency upon impact, as reported in Nature Nanotechnology.

See the source article by following the link below:
Graphene-based armor could stop bullets by becoming harder than diamonds - scientists have determined that two layers of stacked graphene can harden to a diamond-like consistency upon impact, as reported in Nature Nanotechnology.