Abstract
The effect of polydispersity of nickel-silver core-shell nanoparticles (Ni-Ag NPs) on the conductivity of ink coatings was studied. Ni-Ag NPs of various average diameters (100, 220, and 420 nm) were synthesized and utilized for the preparation of conductive inks composed of monodisperse NPs and their polydisperse mixtures. The shell thickness of synthesized Ni-Ag NPs was found to be in the range of 10–20 nm and to provide stability of a core metal to oxidation for at least 6 months. The conductivity of metallic films formed by inks with monodisperse Ni-Ag NPs was compared with those formed by polydisperse inks. In all cases, the optimal conditions for the formation of conductive patterns (weight ratio of monodisperse NPs for polydisperse composition, the concentration of the wetting agent, sintering temperature, and duration) were determined. It was found that metallic films formed by polydisperse ink containing 100, 220, and 420 nm Ni-Ag NPs with a mass ratio of 1:1.5:0.5, respectively, are characterized by the lowest resistivity, 10.9 µΩ·cm, after their thermal post-coating sintering at 300 °C for 30 min that is only 1.6 higher than that of bulk nickel.
Highlights
During the last years, nanoscience and nanotechnology have attracted much attention due to their great impact on the fabrication of functional nanomaterials with novel physical and chemical properties
Taking into account the geometrical aspects, it seems to be rational, that the polydispersity of metallic NPs will favor the formation of films with higher conductivity as compared with monodisperse NPs, since smaller NPs can occupy voids between larger
To prepare polydisperse Ni-Ag NPs dispersion, the previously developed methods of synthesis Ni-Ag NPs were adopted with some modification [18,19]
Summary
Nanoscience and nanotechnology have attracted much attention due to their great impact on the fabrication of functional nanomaterials with novel physical and chemical properties. Various methods of deposition of metal nanoparticles dispersed in a liquid vehicle, such as spin, spray, dip and rod coatings, screen, inkjet, flexo, and gravure printings are used for the fabrication of conductive films [6,7]. The conductivity of such coatings strongly depends on the type of metal and the tightness of nanoparticles packing in the deposited film [8,9].
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