| Summary: | 碩士 === 國立臺灣大學 === 化學工程學研究所 === 96 === Particle size strongly influences the catalytic and electronic properties of materials, therefore the development of reliable methods for the nano-size preparation has been in progress. Metallization by ink-jet printing offers a maskless alternative method to conventional process. Direct ink jet printing can provide low cost, and reduction in process complexity. In this study, we try to synthesize nanosilver particles by electrochemical methods and then ink-jet printing, combined with nanosilver preparation and electroless plating, has been developed and directly writes silver lines at low temperature.
First of all, we have investigated the effect of overpotential in electrodepostion on the particle size, and the effects of electrodeposition on reaction rate in various reaction conditions. In the electrolytic system, the larger overpotential we applied, the smaller particle size we acquired as long as the overpotential is not beyond the potential of reduction of hydrogen. The smallest particle size obtained is 5.4 nm. The production rate of nanosilver particles by electrochemical method has also been found much faster than chemical reduction. The concentration of nanosilver particles by electrodeposition with chemical reduction is four and half times of that by chemical reduction. After ten times of printing we could acquire continuous lines by the formulated nanosilver ink. The silver lines which is thickened by silver electroless plating tiwce is about one thousand nanometers and its resistivity is 19.6 μΩ•cm.
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