Abstract
Among recent advances in electronic packaging technologies, electrically conductive adhesives (ECAs) attract most researchers’ attention, as they are environment-friendly and simple to apply. ECAs also have a lower operating temperature and volume resistivity compared with conventional electronic conductive adhesives. In ECAs, the conducting fillers play a significant role in improving conductivity and strength. In this work, as filler additives, the silver nanowires/graphene nanocomposites (AgNWs-GNs) were successfully fabricated via a facile self-assembly method. The characteristics of the as-prepared nanocomposites were evaluated by FTIR (Fourier Transform infrared spectroscopy), XRD (X-ray Diffraction), XPS (X-ray photoelectron spectroscopy), TEM (Transmission electron microscope) and Raman tests, demonstrating a successful synthesis process. Different amounts of AgNWs-GNs were used as additives in micron flake silver filler, and the effects of AgNWs-GNs on the properties of ECAs were studied. The results suggested that the as-synthesized composites can significantly improve the electrical conductivity and shear strength of ECAs. With 0.8% AgNWs/GNs (AgNWs to GO (Graphite oxide) mass ratio is 4:1), the ECAs have the lowest volume resistivity of 9.31 × 10−5 Ω·cm (95.4% lower than the blank sample without fillers), while with 0.6% AgNWs/GNs (AgNWs to GO mass ratio is 6:1), the ECAs reach the highest shear strength of 14.3 MPa (68.2% higher than the blank sample).
Highlights
Sn-Pb solder is widely applied on electronic packaging for its high conductivity, low melting point, and low cost [1,2]
The results suggested that composites significantly improve the electrical conductivity and shear strength of electrically conductive adhesives (ECAs)
This paper implemented self-assembly method to prepare the composite of silver nanowires and graphene as the filler of epoxy resin conductive adhesive
Summary
Sn-Pb solder is widely applied on electronic packaging for its high conductivity, low melting point, and low cost [1,2]. Ag nanowires and two-dimensional reduced graphene, and reported its conductivity was surprisingly improved [32] Based on these conclusions, researchers tried to implement silver nanoparticles to modify the surface of graphite so that the average conductivity and contact resistance of fillers can be further reduced [33]. Wu et al [34] used surface-modified (with Ag silver nanoparticles) carbon nanotubes in epoxy resin and found that through adding the fillers, the conductivity of ECAs can reach. Zhao et al [35] reported that the volume resistivity of ECAs using graphene, which were surface-modified using Ag nanoparticles, had mass fraction doped 1% and reached a conductivity of 4.6 × 10−5 Ω·cm (close to Sn/Pb solder). The results suggested that composites significantly improve the electrical conductivity and shear strength of ECAs
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