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The promising and extraordinary properties of graphene has attracted significant interest from many researchers especially in various electronic applications. The main aim of this work is to develop graphene-based ink with excellent stability and electrical properties for flexible electronics. Graphene foam (GF) was synthesised by using solvothermal method. GF exhibited multi layers of graphene, good in-plane crystallite quality, a low carbon impurity and relatively low sodium carbonate content. GF was further dispersed into various types of solvents. Results showed that GF dispersed in dimethyl sulfoxide (DMF) and N-methylpyrrolidone (NMP) exhibited good stability. However, these solvents suffer from highly toxic which may damage fertility or the unborn child (hazard code = H360). Besides that, GF dispersed in distilled water with an addition of sodium dodecyl sulfate (SDS) as a surfactant presented good stability as compared to GF ink without surfactant and can be further used as the conductive ink for printable electronics. [ABSTRACT FROM AUTHOR]

• High AgNO 3 concentration and reaction temperature increased yield of AgNPs and subsequently increased electrical conductivity of ink. • Increased AgNO 3 concentration and reaction temperature increased yield of AgNPs and electrical conductivity of ink. • PVP was an effective stabilizing and capping agent for AgNO 3 , leading to greater stability of AgNPs for up to 45 days. • Findings provide insights for development of stable and high-performance waterbased AgNPs conductive inks for various applications. Developing conductive inks for printed electronics has gained increasing interest in recent years as a low-cost and environmentally friendly alternative to traditional organic metal-based inks. This study aims to investigate the influence of silver nitrate (AgNO 3) concentration at different temperatures and the effect of polyvinylpyrrolidone (PVP) surfactant concentration on the properties of the colloidal silver nanoparticles (AgNPs) conductive inks. In this study, water-based AgNPs were prepared using a chemical reduction method. The effect of AgNO 3 concentration, the reaction temperature, and the amount of PVP as a stabilizing agent on the size, shape, and purity of the synthesized AgNPs was investigated. The stability, thermal characteristics, and functional groups of the water-based AgNPs were also evaluated. The printed AgNPs patterns were examined for morphological and electrical properties. Results indicated that the concentration of AgNO 3 and reaction temperature influence the size of AgNPs particles and their clustering. A high concentration of AgNO 3 results in a higher yield of AgNPs and subsequently increases the electrical conductivity to 2.69×10° S/m. Adding PVP improves the stability of AgNPs for up to 45 days. Therefore, the development of water-based colloidal AgNPs conductive ink in this study can be used in inkjet printing to fabricate environmentally friendly printed electronics. [Display omitted] [ABSTRACT FROM AUTHOR]