| In recent years, flexible electronics because of its good flexibility and flexibility, has been more and more attention. Flexible electronics, as an important part of a connection of flexible electronics, is the key to realize flexible electronics predetermined function, but the current flexible circuit face high costs, complex process and other issues in the manufacturing process, therefore, to achieve a flexible conductive trace low-cost, simple process, non-polluting manufacturing is the problems current need to address. Based on the above analysis, on the basis of existing forming method of flexible circuit, a manufacturing method of droplet spray printed deposition forming the flexible circuit was proposed and a pneumatic micro droplet ejection device was developed. Adopting a research methods of combining theory with practice, a steady parameters of droplet ejection on-demand was obtained, studied the whole process of the droplet ejection in the droplet ejection on-demand conditions, analyzed the effect of different factors such as the supply pressure, pulse width, nozzle diameter, etc. on the droplet size and provided a basis for follow-up test to get droplets of different sizes. By the tests of deposition forming silver wires with silver nitrate and ascorbic acid, studied the influence of different sedimentary sequence on square resistance of shaped silver wire, laying the foundation for the subsequent droplets deposition forming the mass circuits.First, a pneumatic micro droplet injection system was developed according to the design, this system main included regulating mechanism, injection device, injection control system, image acquisition system and motion control system, the various parts coordinate and work reliably, laying the foundation for further study droplet spray forming silver wire.Secondly, studied the droplet ejection process of silver nitrate and ascorbic acid based on system injection on-demand. Spray tests were conducted with a pore size of 121μm, 159μm crucible, the concentration of 1.96 mol / L, 1.31 mol / L silver nitrate and ascorbic acid solution, and the stable working parameters of injection on-demand of the both were gotten. On the basis of injection on-demand of the both, the droplet ejection entire process image of silver nitrate and ascorbic acid was acquired, the test results show that the droplet ejection process of silver nitrate and ascorbic acid both have three stages of liquid column elongation, necking breaking into a single droplet, the droplet flight and retraction of the liquid column, indicating the system under the influence of at once the pulse signal could generate single droplets, and achieving jet on-demand of the system. Droplet diameter of silver nitrate and ascorbic acid on stable injection on-demand parameters were gotten, and they were 517μm and 525μm respectively. On the basis of injection on-demand, studied the influence of parameters change on droplet size by changing supply pressure, pulse width, the nozzle aperture and other parameters, the results show that the droplet size increases as the supply pressure, pulse width the nozzle diameter increase.Finally, based on the above studies, in the conditions of injection on-demand, silver wires was cyclical deposited different times on A4 paper, and square resistance of different sedimentary layers of conductive lines were measured. The results showed that with the increase of print sedimentary sequence, square resistance reduced from 2.659Ω /□ to 0.045Ω /□, standard deviation of square resistance reduced from 2.563 Ω/sq to 0.022 Ω/sq. The results of the spectroscopy tests of conductive lines showed product of conductive lines of deposition forming was Ag. SEM tests showed that as the print sedimentary sequence increases, the pores inside silver lines decrease, the number of silver particles produced by the reaction increase. |
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