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분자 자기 집합체 현상에 의한 폴리 페닐렌 비닐렌 다층 박막의 광전자적 특성
Photoelectronic Characteristics of Poly(p-phenylene vinylene) in Self-Assembled Multilayer Films

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Authors
김두식; 차국헌; 홍종달; 유승한; 진정일
Issue Date
1996
Publisher
한국고분자학회 = The Polymer Society of Korea
Citation
Polymer(Korea), 20, 915 (1996)
Keywords
self-assembly(SA) techniquepoly(p-phenylene vinylene) (PPV)conjugation lengthphotoluminescenceconformational constraintexciton migration
Abstract
양이온과 음이온 고분자 전해질 사이의 정전기적 인력을 이용한 분자 자기 집합체 (self-as-sembly, SA) 방법으로 고분자를 적절한 다층 박막으로 가공할 수가 있었다. Poly(p-phenylenevinylene) (PPV) 선구체 (precursor)와 poly(sodium 4-styrenesulfonate) (PSS)의 SA 박막을 만들어 그 성장 양상과 열전환 후 공액 길이 및 photoluminescence (PL) 스펙트럼 변화를 spin-coating한 PPV 박막과의 비교를 통해 알아보았다. PPV 선구체/PSS 다충 박막은 적층된 층수에 비례하는, 안정된 박막 성장을 보여 주었다. 공액 구조로의 열전환이 spin-coating한 박막과는 매우 다르게 관찰되어, SA 과정에서 PPV 선구체에 부여된 사슬 구조상의 제한 요소가 공액 길이 및 그 분포를 제한함을 알 수 있었다. 또한 SA 박막은 그 공액 길이에 관계없이 거의 일정한 PL 스펙트럼을 나타내었으며, 그 방출 파장 및 모양도 spin-coating한 PPV 박막과는 큰 차이가 있었다. 이러한 SA 박닥의 PL 특성은 박막내 PPV 사슬간의 exciton 이송이 PSS에 의해 방해받기 때문인 것으로 추정되었다. ; Self-assembly (SA) technique based on the electrostatic interactions between cationic and anionic polyelectrolytes provided a viable means to fabricate polymers into multilayer thin films. The self-assembled films made from poly(p-phenylene vinylene) (PPV) precursor and poly(sodium 4-styrenesulfonate) (PSS) were prepared, and their layer-by-layer growth and the changes of the conjugation lengths and the photoluminescence (PL) spectra after annealing were compared with those of spin-coated bulk PPV films. PPV precursor/PSS multilayer thin films showed stable growth behavior proportional to the number of deposition. The observed thermal conversion behavior toward the conjugated structure in the self-assembled films which was quite different from that of spin-coated films suggests that the conformational constraint on PPV precursor chains imposed by self-assembling process imparts limitation of conjugation length and its distribution. The self-assembled films with different conjugation lengths were also found to demonstrate almost the same PL spectra, whose, emission wavelength and shape were quite different from those of the spin-coated PPV films. It is believed that such PL spectral characteristics of the self-assembled films are due to the hindrance on exciton migrations between PPV chains (or layers) which is caused by PSS chains (or layers).
ISSN
0379-153X
Language
Korean
URI
http://kiss.kstudy.com/search/detail_view.asp?key=43945

http://www.polymer.or.kr/sub6/sub6_2.php?content=search&seq=7289

http://hdl.handle.net/10371/5904
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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