As the two dimensional crystal, graphene hold great potential as heat dissipation material due to its unique thermal transfer property (5300 Wm−1K−1) exceeding the limit of bulk graphite (2000 Wm−1K−1). However, most of the excellent properties of graphene are estimated based on the nanoscale, which cannot be utilized directly in the industry. Therefore, to fabricate macroscopic assemblies and nano-composites with graphene as the basic building block or nano-filler is highly concerned.
Researchers from group 709 in ICC-CAS fabricated a flexible graphene-carbon fiber composite paper by depositing graphene oxide into the carbon fiber precursor followed by carbonization. The as-obtained hierarchical carbon/carbon composite paper possesses ultra-high in-plane thermal conductivity of 977 Wm-1K-1 and favorable tensile strength of 15.3 MPa, which make the material highly desirable as lateral heat spreader for next-generation commercial portable electronics. (Adv. Func. Mater., 2014, 24: 4222-4228, highlighted as frontispiece)
The structural evolution of the graphene oxide films at different annealing temperatures is critical for obtaining high-performance graphene films. Researchers from Group 708 and 709 in ICC found that 1000 oC is a critical turning point for carbonization, during which the thermal conductivity will climb up rapidly from 6.1 to 862.5 Wm-1K-1. The work provide fundamental insight for the development of graphene based flexible lateral heat spreaders. (J. Mater. Chem. A, 2014, DOI: 10.1039/C4TA02693D).
Graphene-based film can meet the demand for thermal conduction in the field of LED, computer, satellite, and portable electronics as well as other high power, high integration systems. These works provide new perspective for the design of novel structure/function integrated C/C composite materials.