Correlations of the impedance parameters and conductivity and permittivity of liquid and gel phases in a series piezoelectric quartz crystal sensor

Minghui Huang; Dazhong Shen; Lai Man Chow; Mengsu Yang

doi:10.1016/S0925-4005(00)00627-4

Author(s)

Minghui Huang
Dazhong Shen
Lai Man Chow
Mengsu Yang

Detail(s)

Original language	English
Pages (from-to)	21-27
Journal / Publication	Sensors and Actuators, B: Chemical
Volume	72
Issue number	1
Publication status	Published - 5 Jan 2001

Link(s)

DOI	DOI https://doi.org/10.1016/S0925-4005(00)00627-4 Final Published version
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Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-0035151173&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(16a9953a-78cd-465e-8376-35e1c8f44981).html

Abstract

The impedance characteristics of a series piezoelectric quartz crystal (SPQC) sensor were investigated using a network/impedance analyzer. The correlations between the impedance parameters, including the magnitude and phase of the impedance and the resonant frequencies, and the conductivity and/or the permittivity of the test solutions were derived theoretically and in good agreement with the experimental results. It was shown that the value of the series frequency (f_s) decreases with increasing conductivity and permittivity of the liquid. The parallel frequency (f_p) is the constant. The values of the maximum impedance (|Z|_max) and corresponding frequency (f_max,), are not related to the conductivity and permittivity of the liquid. The value of the minimum impedance (|Z|_min) decreases with increasing permittivity and has a maximum in a solution of middle conductivity. The corresponding frequency (f_min) has the same value as the f_s. The maximum phase of the impedance (θ_max) increases slightly with increasing permittivity and has a minimum in electrolyte solution of middle conductivity. In the impedance-frequency curves, there is an iso-impedance point for the SPQC in electrolyte solutions. The SPQC method was applied to monitor the process of hydrogel formation.

Citation Format(s)

[ RIS ] [ BibTeX ]

Correlations of the impedance parameters and conductivity and permittivity of liquid and gel phases in a series piezoelectric quartz crystal sensor. / Huang, Minghui; Shen, Dazhong; Chow, Lai Man et al.
In: Sensors and Actuators, B: Chemical, Vol. 72, No. 1, 05.01.2001, p. 21-27.

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

Huang, M, Shen, D, Chow, LM & Yang, M 2001, 'Correlations of the impedance parameters and conductivity and permittivity of liquid and gel phases in a series piezoelectric quartz crystal sensor', Sensors and Actuators, B: Chemical, vol. 72, no. 1, pp. 21-27. https://doi.org/10.1016/S0925-4005(00)00627-4

Huang, M., Shen, D., Chow, L. M., & Yang, M. (2001). Correlations of the impedance parameters and conductivity and permittivity of liquid and gel phases in a series piezoelectric quartz crystal sensor. Sensors and Actuators, B: Chemical, 72(1), 21-27. https://doi.org/10.1016/S0925-4005(00)00627-4

Huang M, Shen D, Chow LM, Yang M. Correlations of the impedance parameters and conductivity and permittivity of liquid and gel phases in a series piezoelectric quartz crystal sensor. Sensors and Actuators, B: Chemical. 2001 Jan 5;72(1):21-27. doi: 10.1016/S0925-4005(00)00627-4

Huang, Minghui ; Shen, Dazhong ; Chow, Lai Man et al. / Correlations of the impedance parameters and conductivity and permittivity of liquid and gel phases in a series piezoelectric quartz crystal sensor. In: Sensors and Actuators, B: Chemical. 2001 ; Vol. 72, No. 1. pp. 21-27.