Abstract
In this study, we report a novel strategy to prepare graphene nanopapers from direct vacuum filtration. Instead of the conventional method, i.e., thermal annealing nanopapers at extremely high temperatures prepared from graphene oxide (GO) or partially reduced GO, we fabricate our graphene nanopapers directly from suspensions of fully reduced graphene oxide (RGO), obtained after RGO and thermal annealing at 1700 °C in vacuum. By using this approach, we studied the effect of thermal annealing on the physical properties of the macroscopic graphene-based papers. Indeed, we demonstrated that the enhancement of the thermal and electrical properties of graphene nanopapers prepared from annealed RGO is strongly influenced by the absence of oxygen functionalities and the morphology of the nanoflakes. Hence, our methodology can be considered as a valid alternative to the classical approach.
Highlights
Two-dimensional (2D) materials, i.e., one-atom thick layers of van der Waals materials, have gained worldwide attention because of their outstanding properties that arise from their structure and dimensionality [1,2]
We have recently reported that the thermal properties of reduced graphene oxide (RGO) flakes after thermal annealing at 1700 ◦C are increased due to the reduction of oxygen-functional groups and the ordering of the graphene structure [32]
We present the successful fabrication of lightweight nanopapers from both conventional RGO and less defective thermally annealed RGO flakes as well as the assessment of their thermal and electrical properties
Summary
Two-dimensional (2D) materials, i.e., one-atom thick layers of van der Waals materials, have gained worldwide attention because of their outstanding properties that arise from their structure and dimensionality [1,2]. Real-world applications such as sensors, electronic devices, thermal management, energy storage conversion and electromagnetic interference (EMI) shielding, to name only a few, often demand the development of flexible, lightweight, paper-like materials with high electrical and thermal conductivity and good corrosion resistance [11,12,13,14,15]. Recent advances in the development of flexible graphene paper-like architectures with superior thermal and electrical properties have focused their attention on different assembly strategies [11,14,15,16]. Despite the oxygen-bearing groups facilitate the stabilization of GO in water or polar solvents, they disrupt the sp hybridization of graphene layers, deteriorating the thermal and electrical conductivities of the nanoflakes and, in turn, reducing the performance of the as-prepared GO papers
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