Thermal management system containing an integrated graphene film for electronic devices

A graphene-based heat dissipation system for an electronic device, comprising:

• (a) an electronic device comprising a heat source, wherein the heat source transmits heat to a second component or an external surface of the electronic device;
• (b) a heat-conducting layer comprising two major surfaces, the heat-conducting layer being positioned such that one of its major surfaces is in operative contact with the heat source such that it is interposed between the heat source and the second component or the external surface of the electronic device;
• wherein the heat-conducting layer consists of a graphene material which is made from one or more sheets of integrated graphene film which thermally shields the second component or the external surface of the electronic device from heat generated by the heat source, wherein said integrated graphene film is composed of chemically merged graphene oxide gel molecules that are merged in an edge-to-edge manner or graphene oxide gel-bonded nano graphene platelets (NGPs) and exhibits a thermal conductivity of at least 600 W/mK, and said integrated graphene film has at least one of the following features:
• i) having an oxygen content of at least 0.1% by weight, but less than 10% by weight;
• ii) having a single grain, a single crystal, or few grains that has no or few sheet-to-sheet grain boundaries per layer;
• iii) having an electrical conductivity greater than 2,000 S/cm, a physical density greater than 2.0 g/cm3, or a tensile strength greater than 40 MPa.