Researchers from Rensselaer Polytechnic Institute have discovered that graphene foam can outperform leading commercial gas sensors in detecting potentially dangerous and explosive chemicals. The foam is made from several graphene sheets (grown on Nickel, which was later removed) and is flexible, rugged and retains graphene's important properties:

http://www.graphene-info.com/graphene-foam-can-detect-explosives-and-other-dangerous-chemicals