Flexible Graphene-Glass Fiber Composite Film with Ultrahigh Thermal Conductivity and Mechanical Strength as Highly Efficient Thermal Spreader Materials

Most commercial thermal spreader materials have satisfactory thermal conductivity but inferior mechanical strength and flexibility. Therefore, how to simultaneously improve ultrahigh thermal conductivity and excellent mechanical properties for heat spreaders is a still under challenge. Here, we demonstrated that the use of graphene oxide and glass fiber can fabricate graphene-glass fiber composite film with ultrahigh thermal conductivity, high mechanical strength, and flexibility, by bar-coating method. The one-dimensional glass fibers were chose as the scaffolds, which reinforce the mechanical strength. The in-plane thermal conductivity of the graphene-glass fiber composite film reaches 952±104 W/mK, while the mechanical strength is up to 106.9 MPa. In addition, the composite film shows excellent flexibility. The bar-coating method is easily scaled up for wide applications. It is believed that the graphene-glass fiber composite film can be used as high-performance heat spreaders in high-power devices for highly efficient thermal management.