The positively charged poly(diallyldimethylammonium chloride) (PDDA) and the negatively charged poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) were fabricated to multilayer thin films using layer-by-layer(LbL) method. In order to fabricate uniform and dense multilayer thin films, both PDDA and PEDOT:PSS were required to induce linear conformation of polymer chains. By adding 0.01 M NaCl in PEDOT:PSS solution as controlling ionic strength, the structures of PEDOT:PSS were linear to form uniform thin films. As the concentration of PDDA solution was reduced, PDDA was found to have linear structure which was suitable for coating with PEDOT:PSS. By applying spin to the substrate to induce the shear force to the polymer solution, the polymers were physically made to have linear structure so that more uniform and dense multilayer thin films were obtained.

Layer-by-layer(LbL) 방법을 이용하여 양전하의 poly(diallyldimethylammonium chloride)(PDDA)와 음전하의 poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) 다층박막을 제조하였다. 균일하고 조밀한 LbL 다층박막 두께 성장을 위하여 PDDA와 PEDOT:PSS 고분자가 선형으로 존재하도록 유도하였다. PEDOT:PSS 수용액에 0.01 M NaCl을 첨가하여 이온 강도를 조절한 결과, PEDOT:PSS가 선형으로 존재하여 균일한 박막을 형성함을 확인하였다. PDDA의 농도를 저농도로 줄인 경우, PDDA가 선형으로 존재하게 되어 PEDOT:PSS와 균일하게 코팅하기 유리한 것으로 나타났다. 또한 기판을 회전하여 수용액에 전단 응력을 인가한 경우, 고분자가 선형 구조를 가지도록 물리적으로 유도되어 더욱 균일하고 조밀하게 적층된 다층박막이 형성되었다.

Keywords: layer-by-layer assembly, thin film, poly(diallyldimethylammonium chloride), poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate), polyelectrolytes.