阻抗型压电二氧化碳传感器的研制和应用

Piezoelectric Crystal Impedance Sensor for Carbon Dioxide and Its Use for Preparation of Glutamate Sensor

基于串联式压电晶体对溶液电导率和介电常数的灵敏响应，研制了一种灵敏度高、响应快、稳定性好的阻抗型压电二氧化碳传感器；同时，探讨了利用阻抗型压电二氧化碳传感器组装酶传感器的可行性。实验结果表明这类二氧化碳传感器不需要参比电极，不便用易碎的玻璃ｐＨ电极，用于组装酶传感器具有结构简单、装配容易。

A new piezoelectric crystal impedance sensor for the determination of carbon dioxide in aqueous solution is presented. It is realized by using a series piezoelectric crystal(SPC)device, which is constructed by connecting an AT-cut piezoelectric crystal with a probe in series. The present sensor exhibits a favourable frequency response to 5×10 -6 -10 -2 M carbon dioxide. The use of the carbon dioxide sensor for preparation of glutamate sensor has been investigated. The glutamate sensor is fabricated by mounting the squash tissue slices on the probe surface of the carbon dioxide sensor. Results show the carbon dioxide is attractive alternative internal sensing element to develop biosensors for its requires neither a reference electrode nor a fragile internal glass pH electrode.