Abstract
In this study, we report a facile and green process to synthesize high-quality and few-layer graphene (FLG) derived from graphite via a liquid exfoliation process. The corresponding characterizations of FLG, such as scanning electron microscopy (SEM), transmission electron microscope (TEM), atomic force microscopy (AFM) and Raman spectroscopy, were carried out. The results of SEM show that the lateral size of as-synthesized FLG is 1–5 μm. The results of TEM and AFM indicate more than 80% of graphene layers is <10 layers. The most surprising thing is that D/G ratio of graphite and FLG are 0.15 and 0.19, respectively. The result of the similar D/G ratio demonstrates that little structural defects were created via the liquid exfoliation process. Electronic conductivity tests and resistance of composite film, in terms of different contents of graphite/polyvinylidene difluoride (PVDF) and FLG/PVDF, were carried out. Dramatically, the FLG/PVDF composite demonstrates superior performance compared to the graphite/PVDF composite at the same ratio. In addition, the post-sintering process plays an important role in improving electronic conductivity by 85%. The composition-optimized FLG/PVDF thin film exhibits 81.9 S·cm−1. These results indicate that the developed FLG/PVDF composite adhesives could be a potential candidate for conductive adhesive applications.
Highlights
Electronics or microelectronics industries have transitioned into making electronics lighter, smaller, thinner and more highly efficient [1,2]
Electron microscopic examination shows the as-synthesized few-layer graphene (FLG) has a lateral size of 1–5 μm
atomic force microscopy (AFM) indicates microscopic examination shows the as-synthesized FLG has a lateral size of 1–5 μm
Summary
Electronics or microelectronics industries have transitioned into making electronics lighter, smaller, thinner and more highly efficient [1,2]. Many researches use carbon nanotubes (CNTs) [10,11,12] as fillers to improve the electrical properties of ECAs due to their high conductivity, flexibility, and large aspect ratios, and report the establishment of a percolated network at low filler content. Ansari et al studied and compared the properties of functionalized graphene sheet/PVDF (FGS/PVDF) and exfoliated graphite/PVDF (EG/PVDF), which were prepared via a solution process with subsequent compression to fabricate conductive nanocomposites. According to their results, FGS remained well dispersed in PVDF and showed wrinkled topography with relatively thin graphene sheets that were bonded well in the matrix [27]. The graphene obtained by this method was combined with polymer to make ECAs
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