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This article addresses the development of a graphene/silver nanoparticle (Ag NP) ink and its deployment in an aerosol-jet additive manufacturing system in order to print highly conductive and flexible graphene/Ag patterns for flexible printed electronics. Printing with graphene/Ag NP ink produced a uniform microstructure and crack-free printed patterns. With a mean resistivity of 1.07 × 10 − 4 Ω cm, these graphene/Ag NP patterns have about 100 times less resistivity compared to graphene patterns and three times less resistivity than Ag NP patterns, made with the same printing system. With their low degree of resistivity and the same flexibility as the graphene printed patterns, resulted from the bending test, graphene/Ag aerosol-jet printed patterns may therefore be considered as an efficient candidate compared to either graphene or Ag NP printed patterns for flexible electronics. [ABSTRACT FROM AUTHOR]

Abstract: A high-purity, surfactant-free and stable SWCNT aqueous solution was prepared using a series of chemical and physical processes. The SWCNT solution has a very limited amount of carbonaceous impurities, if any, and a total metal content of well below 500ppb. It is stable for months without the addition of surfactant. Such SWCNT aqueous solution enables ink-jet printing of the entire fast, flexible SWCNT-based field-effect thin-film transistor (FE-TFT) at room temperature without the engagement of any traditional dry or wet chemical processes used for fabricating silicon-based transistors. High-speed SWCNT-based flexible FE-TFTs were printed using Aerosol Jet® printing technology. The printed flexible FE-TFTs were characterized to have a current ON–OFF ratio of greater than 130 with an operation frequency of greater than 5GHz. [Copyright &y& Elsevier]