Various flexible applications using CNTs and graphene. a, Active-matrix of SWCNT TFTs for a pressure sensor device. Reproduced with permission . Copyright 2011, American Chemical Society. b, Flexible active-matrix design using SWCNTs as the channel material of the TFTs in OLEDs. Reproduced with permission . Copyright 2013, Nature Publishing Group. c, Flexible RF device using solution-based graphene. Graphene is an ideal material for high-speed communication systems owing to its uniquely high carrier mobility. Reproduced with permission . Copyright 2012, American Chemical Society. d, Flexible, transparent, and noncytotoxic graphene electric field stimulator. Reproduced with permission . Copyright 2013, American Chemical Society. e, Transparent and flexible memory devices using SWCNT channel and graphene electrodes. The oxygen-decorated graphene electrode revealed an initially large hysteresis in SWCNT/graphene TFT. Adapted with permission .