Fig. 4From: Chemical and biological sensors based on defect-engineered graphene mesh field-effect transistorsId–Vg curves for electrolyte-gated graphene-based FETs in various pH buffer solutions. a Pristine graphene, b graphene nanoribbons, c normal graphene, and d graphene mesh. a, b Adapted with permission from Ref. [25], © American Chemical Society. c, d Reproduced with permission from Ref. [32], © American Chemical SocietyBack to article page