Synthesis Of Silver Nanomaterials Structures And Application Research In The Field Of Inkjet Printing Electronics

Flexible electronics and printed electronics are one of the development directions of electronic equipment manufacturing in the future,and they are also indispensable technologies for the realization of wearable electronic products and the Internet of Things.In the research field of printed electronics technology,inkjet printing technology has become a research direction with practical application value due to its advantages such as no photoresist,screen,mask,fast molding,low cost,short process,and high efficiency.Conductive inks are key consumables for printed electronic equipment.Silver nanoparticle(AgNPs)ink,silver nanowire(AgNWs)ink and Particulate Free Reactive(PFR)silver ink are the three major conductive inks.Main research ideas.The bottlenecks in the preparation of silver nanomaterials include poor circuit connectivity of AgNPs,poor fluidity of AgNWs,and low deposition efficiency of reactive inks,which to a certain extent limits its wide application in these fields.Improving silver nanomaterial technology,realizing the controllable preparation of the size and morphology of silver nanomaterials,and combining advanced printed electronic technology to develop flexible conductive films and adjust photoelectric performance and performance stability have become the focus of current scientific and technological research..In this paper,based on the redox mechanism,AgNO₃ was used as the main silver source,PVP was used as nucleation control agent,and ethylene glycol and NaBH₄were used as reducing agents to prepare AgNWs and AgNPs,respectively.The influence of synthetic process parameters on the morphology and size of silver nanomaterials was analyzed.Using AgNWs/AgNPs as a conductive medium to prepare a conductive ink with water as a dispersant,a flexible conductive film and a patterned flexible conductive circuit were prepared on a surface-modified PET and non-woven fabric(NWF)substrate.The square resistance and bending performance of conductive films and conductive circuits printed on PET and NWF were tested,laying an important foundation for its application in the field of flexible printed electronics.The specific research content and results are as follows:AgNWs with an aspect ratio of up to 700 were prepared by polyol method,AgNPs with diameter(<40 nm)were prepared by chemical reduction method,and the influence of each reaction condition on the final morphology and size was analyzed.,Summarizing the synthesis mechanism and optimizing the synthesis process route,purifying the silver nanomaterial product by changing the centrifugal speed and time and alternating washing with ethanol and acetone,and verifying that the quality of silver nanomaterials obtained by thermogravimetric analysis accounts for more than 98%of the silver nanomaterials.Inkjet printing equipment is used to combine substrate pretreatment and sintering post-treatment technology to prepare flexible conductive films with a sheet resistance of 3.8?/sq(PET)and 14.0?/sq(NWF)on different flexible substrates.At the same time,silver PFR ink was prepared with AgNO₃ as the silver source,NaBH4 as the reducing agent,ethylene glycol as the viscosity regulator and deionized water as the solvent.The square resistance on different flexible substrates was 8.34?/sq(PET),and41.38?/sq(NWF)flexible conductive film.In order to demonstrate the application of printed conductive patterns on flexible electronic devices,the resistance value of the printed conductive pattern has no obvious change when it is bent 1000 times through a bending experiment,indicating that it has a reliable application prospect in the field of flexible printed electronics.