Graphene Oxide (GO) support film is available as Single Layer (0.6~1nm) or Double Layer (1~1.5nm) measured by EELS. It is hydrophilic and naturally placed over the ultra-flat Silicon Dioxide Substrate, Lacey Carbon (300 Mesh Copper TEM Grids) or Holy Silicon Nitride Membranes with typically 50-70% coverage. Available in package of 5, 10 or 25 pieces. A. 300 Mesh Copper TEM grid with Lacey Carbon film; B. 00nm-thick 2µm Diameter Holey Silicon Nitride Membrane on 200µm-thick Silicon Substrate; C. 5x5mm 675µm-thick Silicon Die with 200nm Thermal Oxide.