Touch unit, touch substrate and manufacturing method thereof, and flexible touch display device

A method for manufacturing a touch substrate, comprising:

• forming a first graphene layer on a base substrate;
• forming an inorganic material layer on the first graphene layer;
• forming a second graphene layer on the inorganic material layer so as to form a composite graphene layer, in which the inorganic material layer reduces the impedance of the first graphene layer and the second graphene layer;
• and
• patterning the composite graphene layer to form a plurality of touch units.

A method for manufacturing a touch substrate, comprising:

• forming a first graphene layer provided with an electrode pattern on a base substrate;
• forming an inorganic material layer on the first graphene layer;
• and
• forming a second graphene layer provided with an electrode pattern on the inorganic material layer, so as to form a composite graphene layer, in which the inorganic material layer reduces the impedance of the first graphene layer and the second graphene layer.