Research On Ink-jet Printed Silver Nanoink Preparation And Application

With the development of modern micro/nano fabrication technology and nanophotonics,new-concept consumer electronics are manufactured with the trend of being small and flexible.On this background,printed electronics based on metal nanoink,as the crossing field of nanotechnology,printing technology and electronics,has gained wide attention with the advantages of being quick,convenient,environmentally-friendly,and so on.As one of drop-on-demand printing methods,ink-jet printing becomes a research topic of heightened interest.The main research topics of ink-jet printing are focused on three aspects:1,high-concentration metal nanomaterials synthesis and stability control,as the property of nanomaterials has a direct influence on nanoink,and high-concentration nanoparticles synthesis plays an important role in mass application of printed electronics.2,post processing of printed patterns,including joining nanoparticles at the atomic level,and reducing sintering temperature to apply for flexible electronics.3,devices applications,which is focused on fabricating new-concept photoelectric devices.On this background.a series of research work was conducted,including ink-jet printing of silver nanoink,post-processing and application.First,a seeds triggered massive polyol synthesis was proposed,which realized great control of size and shape in the condition of high concentration.At the meantime,ammonium reduction method was studied,and the influences of reaction parameters on products were discussed.The size and morphology properties of nanoparticles was characterized by different methods,and the growing mechanism was analyzed.Secondly,a multi-step room temperature post-processing method was proposed for paper electronics,which included acetone washing,LED white light irradiation and electroless plating.The sintering result was analyzed through surface morphology characterization.A resistivity of 7.6×10-8 Ω · m was achieved,which corresponded to conductivity of 21.7%of that of bulk material.A photon-assisted mild temperature sintering was proposed,and a resistivity,which is 36.4%lower than the result of 120 ℃ thermal sintering,was obtained at 70 ℃.These two methods produced great sinering results,without causing damage to substrates,which made it practical to flexible electronics.In the end,the photoelectric applications of paper electronics were discussed.The electrical performances of the printed circuits associated with the printing uniformity,mechanical flexibility and strain sensitivity were investigated systematically,and paper-based LED circuits and RFID tag antennas were fabricated.Furthermore,silver films of different densities and nano graphics arrays with manageable reflectivity properties on paper substrates were prepared through grayscale controlling in ink-jet printing.In addition,this method was integrated with color printing and 3D paper folding to realize innovative imaginative 3D flexible electronic devices,which provided a new direction for the development of printed electronics.