Study on the ion transport of polyaniline thin film using electrogravimetric impedance technique = 전자무게 임피던스법을 이용한 폴리아닐린 박막에서의 이온이동연구

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Recently developed elctrogravimetric impedance technique, which combines the EQCM and electrochemical impedance technique, is very useful method in the study of ion transport in conducting polymer. It makes no morphological change of the polymer film and can separate the respective information of anion and cation. In this study, elctrogravimetric impedance technique was constructed and applied to the study of polyaniline, which is one of the most promising conducting polymers. The respective contribution to ion transport and the diffusion coefficients of anion($ClO_4{^-},HSO_4^{-},Cl^{-}$) and proton($H_3O^{+}$) were obtained and their dependence on the electrode potential and pH of bathing solution was investigated. The proton contribution increases with the decreasing dc potential and the decreasing solution pH, which is consistent with others`` reports that proton transport largely takes place at the initial stage of oxidation process and the proton contribution increases as PAN film is more protonated. The diffusion coefficients of proton and anion show the same order of magnitude. These values decrease with decreasing dc potential and increasing solution pH, which can be explained by the facts that ion transport is harder as the conducting polymer is in its insulating state and diffusion coefficients increase with the increment of ionic concentration in bathing solution resulting in that in the film.
Advisors
Kwak, Ju-Hyounresearcher곽주현researcher
Description
한국과학기술원 : 화학과,
Publisher
한국과학기술원
Issue Date
1996
Identifier
106648/325007 / 000943463
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 화학과, 1996.2, [ vi, 45 p. ]

Keywords

Polyaniline thin film; Electrogravimetric impedance technique; Ion transport; 이온이동; 폴리아닐린 박막; 전자무게임피던스법

URI
http://hdl.handle.net/10203/32750
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=106648&flag=dissertation
Appears in Collection
CH-Theses_Master(석사논문)
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