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0920-S02-05

Fabrication of Ag Nanoparticles/poly(3,4-ethylenedioxythiophene) Nanocomposite Electrodes by Ink-jet Printing Joon Ho Lee, Jin heon Kim, Tea-Heon Kim, and Chang Seoul Department of Advenced Fiber Engineering, Division of Nanosystems Engineering, Inha University, 253,Yonghyun- Dong, Nam-Gu, Inchoen, Korea, Republic of ABSTRACT The conductive polymer poly (3,4-Ethylenedioxythiophene) (PEDOT) is a low band-gap polymer with high charge mobility and good thermal and chemical stability. Nanosized Ag particles have found many potential applications in technical fields because of their reduced sizes, high surface-to-volume ratio, and relatively high chemical stability in air. In this report, 3,4Ethylenedioxythiophene (EDOT) was used as the reductant for the first time in the preparation of silver nanoparticles by the reduction of AgNO3 in water. And Ag/PEDOT nanoparticles composites conducting films deposited by inkjet printing technique on plastic substrates.

INTRODUCTION Polymer electronics is considered a promising technology because of the light weight, high flexibility, and solution-processible properties of the materials [1]. Ink-jet printing is a familiar method for printing ink on absorbent paper. It has the advantage of being fast and simple with a high throughput [2]. A desk top computer and a standard ink-jet printer can control the delivery of picoliter volumes of liquids in precise patterns. Therefore, ink-jet printing does not consume a significant amount of material, as is the case with spin coating. It promises to be a low cost, mask-less, non-contact patterning approach [3]. Both organic and metallic components have been manufactured using this novel technique [4-7]. Metallization and metal to conducting polymer contact are two important aspects in the polymer flexible microelectronics. Silver as a best conductor is studied most intensively for metal deposition by ink-jet printing. Organo-silver compounds [5,6] or silver nanoparticle suspensions [5-7] have been used for ink-jet printing silver conductors. Among conducting polymers, poly(3,4-ehtylenedioxythiophene)(PEDOT), which possesses remarkable transparent conducting and electro-chromic properties, has been employed in ITO electrode modification of polymer light-emitting diodes [8] the preparation of antistatic, transparent coating [9], and the metallization of insulating devices [10].

In this paper, Ag/PEDOT nanoparticles composites were synthesized by UV irradiation. EDOT be used as the reductant to reduce AgNO3 in water, and the silver nanoparticles were obtained successfully. In addition, Ag/PEDOT nanoparticles composites conducting films fabricated by inkjet printing technique on plastic substrates.

EXPERIMENTAL 3,4-Ethylenedioxythiophene(EDOT) was obtained from Bayer Company and purified by distillation under reduced pressure before use. Silver nitrate (AgNO3) was purchased from Aldrich. Other reagents were used as received. Silver nitrate is used as the metal precursor. Water is selected as the solvent. Silver nitrate 0.5g is dis