Viscoelastic phenomena during electrochemical deposition of polyaniline films

被引:15
作者
Mohamoud, Mohamoud A. [1 ]
Hillman, A. Robert [1 ]
机构
[1] Univ Leicester, Dept Chem, Leicester LE1 7RH, Leics, England
关键词
viscoelasticity; shear modulus; polyaniline; conducting polymer; acoustic wave device; quartz crystal microbalance;
D O I
10.1007/s10008-007-0266-8
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Electrochemical quartz crystal microbalance (EQCM) and crystal admittance measurements were used to study the potentiodynamic electrodeposition of polyaniline films. Variations in peak admittance provided the distinction between acoustically thin and acoustically thick films. In the former instance, the Sauerbrey equation was used to interpret the EQCM frequency shift in gravimetric terms. In the latter case, admittance spectra were interpreted viscoelastically to yield shear storage and loss moduli. Variations in storage modulus with potential (within a given deposition cycle) and with number of deposition cycles (at a given potential) were small, covering the range 1.1-1.6 x 10(7) dyn cm(-2). Variations in loss modulus were much more dramatic, increasing from very low levels typical of a simple fluid to values similar to the storage modulus. More subtle variations of both components within a single potential cycle were highlighted using a novel differential format. This revealed two peaks, correlating with the first film redox process and with further film oxidation/polymerization.
引用
收藏
页码:1043 / 1050
页数:8
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