###### Abstract
High electrical conductivity values required for inkjet printing applications can be typically achieved only when dispersed particle concentrations are above the so-called percolation threshold [18]; on the other hand, at this level of concentration (12-30 vol.%) the viscosity of the system may limit applications as electrically conductive inks. Percolation theory suggests that mixed morphology systems with both rod- and spherical or platelet-shaped particles enable a significant reduction in percolation threshold concentration down to below 1-2 vol.%, so the system remains sufficiently diluted and has low viscosity. A certain amount of studies are devoted to the subject [19; 20], and graphene/graphite-metal nanorods-based colloids seem to be the most promising. Most studies report that the higher the metal content is in a hybrid suspension, the higher the electrical conductivity; however, most studies operated in a limited concentration range. Nonetheless, several theoretical and experimental studies suggest that there should be an optimal component ratio in a 1D + 2D-morphology system [21; 22; 23; 24; 25; 26; 27]. Transparent conductive electrodes (TCE) widely used for photovoltaics [28], light-emitting diodes [29], sensor screens [30], smart windows [31], and antistatic coatings [32] seem to be particularly challenging as objects of flexible and printed electronics, as achieving both high electrical conductivity and high transparency is challenging even for ink formulations, let alone films. This happens because electrical conductivity increases with solid phase concentration; so, however, does optical absorption; thus, relatively low percolation thresholds are required from the suspension. Therefore, it is crucial to achieve an optimal conductive phase concentration that provides sufficient conductivity and transparency at the same time. Another important requirement for TCE applications is the maximization of optical spectrum smoothness, that is, the absence of absorption peaks in the visual region. Unfortunately, AgNPs are known for optical absorption peaks at 300-420 nm due to surface plasmon resonance (SPR) [33], which needs to be suppressed for effective use in TCE. There are several studies that addressed graphene-based nanoplatelets/metallic nanorods hybrid systems for manufacturing TCE for electromagnetic shielding [34], electromagnetic shielding [35], optoelectronic devices [36], light-emitting diodes [37], solar cell technologies [38; 39; 40; 41], and display and various sensor devices [42; 43; 44; 45; 46]. Although much effort has been made to achieve combinations of high conductivity and high transparency in films, little data is published on the properties of the suspensions themselves, as well as on how the graphene/metal nanoparticle ratio affects the properties of suspensions and films derived from them. In the present paper, we report hybrid few-layered graphene/AgNP electrically conductive suspensions in a mixed water-ethylene glycol (EG) system. Graphene suspensions were prepared via direct ultrasonic-assisted liquid-phase exfoliation in a water-surfactant system. AgNPs were manufactured via polyol synthesis in EG in the presence of polyvinylpyrrolidone (PVP) as a surface-stabilizing agent. It is shown that after mixing and ultrasonic treatment of the suspensions, AgNPs decorate the graphene surface. Particle size distributions, electrical conductivity, and optical absorption in the visible region were studied throughout the whole range of graphene:AgNP ratios (0-100 wt.%). In order to obtain the inks potentially suitable for TCE applications, we used mild centrifugation to separate large particles. Electrically conductive transparent suspensions showed a synergistic effect of both optical absorption and electrical conductivity. Films obtained from the suspensions were also characterized by optical and electrical resistance measurements.