An antibacterial device is disclosed, comprising a substrate and an antibacterial coating or antibacterial surface being provided on a surface or a part of a surface of the substrate. The antibacterial coating/surface comprises Angstrom scale flakes, where the Angstrom scale flakes are arranged in a standing position on the surface and attached to the surface via edge sides thereof The Angstrom scale flakes can e.g. be graphene flakes, or graphite flakes having a thickness of a few atom layers. It has been found that such standing flakes are efficient in killing prokaryotic cells but does not harm eukaryotic cells.
