Devices and methods relate to inducing or promoting hemostasis. The hemostasis device may include a support layer having a first surface and an opposing second surface. The device may include a layer, the layer disposed on the first surface. The layer may include a target surface configured to contact a target site. The layer may include a monolayer of about 100% graphene or may include laser-reduced graphene oxide. The device may include a sensor configured to measure a level of hemostasis of the target site. The methods relate to a method of manufacturing a hemostatic device including a monolayer of graphene or a layer of laser-reduced graphene oxide.
