Carbon-based materials such as carbon nanotubes (CNTs) and graphene have attracted attention because of ultrahigh thermal conductivity by limited phonon scattering and high phonon velocity. The thermal conductivity of individual carbon nanotube and single layer graphene is known to be 3000-3500 and 3000-5300 W/mK, respectively. Thus, carbon materials have been used as nano-fillers to enhance the thermal conductivity of polymer composites, and as lateral heat spreaders to reduce the temperature in electronic devices. In addition, for a broader range of applications of carbonbased materials as thermal spread film, fabrication of freestanding thin film is one of important issue. For the fabrication of freestanding thin film, polymer composites were used with CNT or graphene. However, polymer composites with CNT or graphene have very low thermal conductivity property, because most of polymers have very low thermal conductivity. H. Chen., et al. have demonstrated that reduced graphene oxide (rGO) sheets dispersed in water can be assembled into a well-ordered strong rGO paper without polymers or surfactant stabilizers.8 Using this method, we can fabricate freestanding thin film with low-cost and large-scale production. This freestanding graphene films have used various applications. For many potential applications, basic properties of rGO thin film are very important. Mechanical properties and electrical conductivity of rGO thin film were reported.8 However, thermal conductivity properties of rGO thin film and rGO layer have not been reported yet.
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机译：由于通过有限的声子散射和高声子速度，碳纳米管（CNT）和石墨烯如碳纳米管（CNT）和石墨烯的碳基材料引起了注意力。已知各种碳纳米管和单层石墨烯的导热率分别为3000-3500和3000-5300W / mK。因此，已用作纳米填料的碳材料以增强聚合物复合材料的导热率，以及作为横向散热器以降低电子器件中的温度。此外，对于碳铸材料的更广泛的碳基材料作为热涂膜的应用，独立式薄膜的制造是重要问题之一。为了制造独立薄膜，聚合物复合材料与CNT或石墨烯一起使用。然而，具有CNT或石墨烯的聚合物复合材料具有非常低的导热性性能，因为大多数聚合物具有非常低的导热性。 H. Chen。等。已经证明，将分散在水中的还原的石墨烯（RGO）片材可以组装成良好的有序的强RGO纸，而无需聚合物或表面活性剂稳定剂.8使用这种方法，我们可以用低成本和大规模生产制造独立的薄膜。这种独立的石墨烯薄膜使用了各种应用。对于许多潜在的应用，RGO薄膜的基本属性非常重要。报道了RGO薄膜的力学性能和导电性。然而，尚未报道RGO薄膜和RGO层的导热性能。
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