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Investigations by electrochemical quartz crystal impedance system—electrodeposition of silver and polyaniline
Author(s) -
Xie QingJi,
Liu HongWei,
Zhang YouYu,
ShouZhuo Yao
Publication year - 1999
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19990170510
Subject(s) - chemistry , analytical chemistry (journal) , potentiostat , electrode , crystal (programming language) , quartz , polyaniline , electrical impedance , equivalent circuit , capacitance , dielectric spectroscopy , electrochemistry , surface roughness , resonance (particle physics) , quartz crystal microbalance , materials science , composite material , electrical engineering , voltage , atomic physics , chromatography , computer science , polymerization , programming language , engineering , polymer , adsorption , organic chemistry , physics
Abstract An electrochemical quartz crystal impedance system (EQCIS) which allows rapid and simultaneous measurements of admittance spectra of piezoelectric quartz crystal resonance during electrochemical processes was developed by combining an HP 4395A Network/Spectrum/Impedance analyzer with an EG & G M283 potentiostat. Non‐linear least square regression analyses of simultaneously acquired conductance and susceptance data were discussed in detail, giving that R m , C s , 1/ C m (or L m ) and of as estimation parameters is the best choice among various fitting routines. Equivalent electrical circuit parameters of quartz crystal resonance during electrodeposition of silver and polyaniline and electrochemical processes of the deposits were obtained and discussed according to changes in electrode mass, electrode surface roughness and film conductivity etc . The significant changes of motional resistance R m and static capacitance C , observed in the silver case was believed to result mainly from changes in electrode surface roughness and the linear relationship between them was well explained by the following equation, C s = C q + C e = ε q A q / h q + ε e k 2 R m / [ h e (ωρ L η L ] 1/2 .