PERTURBATION OF THE ELECTRIFIED INTERFACE AND THE RESPONSE OF THE THICKNESS-SHEAR MODE ACOUSTIC-WAVE SENSOR UNDER CONDUCTIVE LIQUID LOADING

被引:55
作者
YANG, MS [1 ]
THOMPSON, M [1 ]
机构
[1] UNIV TORONTO,DEPT CHEM,80 ST GEORGE ST,TORONTO M5S 1A1,ONTARIO,CANADA
关键词
D O I
10.1021/ac00072a011
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The behavior of the thickness-shear mode (TSM) acoustic wave sensor under conductive liquid loading has been examined by acoustic network analysis. The response of the TSM sensor arises from the perturbation of the electrified interface, including the acoustoelectric coupling of the surface potential with ionic species and the formation of the electrical double layer. In dilute solutions, dissipation of acoustic energy resulting from acoustoelectric coupling dominates the complete energy-transfer process, which leads to a rapid decrease of the series resonant frequency and an increase in the motional resistance. In concentrated solutions, energy transfer from the quartz dielectric to the interface becomes more important due to increasing energy storage of the double layer, as shown by the continuing increase of the static capacitance and steady decrease of the parallel resonant frequency. In addition, the overall energetics of the dissipation and transfer processes at the interface are reflected in the measurement of the quality factor.
引用
收藏
页码:3591 / 3597
页数:7
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