Surface Acoustic Wave Gas Sensor with Semiconducting Sensorial Layer

• Autorzy: Jakubik W.
• Języki publikacji: EN

Abstrakty

EN

The aim of these investigations was to verify the argument presented early, stating that the electric conductivity of the sensorial layer affects the detective properties of SAW gas sensors. The initial value of the electric conductivity of the layer determines the working point of the sensor and is of essential importance with respect to the sensitivity of the sensor, because it determines the value of the acoustoelectric effect in the piezoelectric wave-guide- semiconducting sensorial layer. The degree of the velocity changes of wave propagation depends on the initial surface conductivity (in air). In the case of the wave-guide consisting of LiNbO3 (Y-Z cut) the sensor is most sensitive when surface conductivity is about 1.6x10 -6 Omega -1. Basing on measurements it has been found that the electric conductivity of lead phthalocyanine layer placed in on NO2 atmosphere increases. This effect becomes higher as the temperature rises. It has been found that the conductivity of lead phthalocyanine layer s depends on the frequency to an extremely high degree. Practically, the value of the conductivify of semiconducting layers at higher frequencies makes possible the occurrence of an acoustoelectric effect in the sensor.

• Wydawca: Silesian Division of Polish Acoustical Society
• Czasopismo: Molecular and Quantum Acoustics
• Rocznik: 1999
• Tom: Vol. 20
• Strony: 81--92
• Opis fizyczny: Bibliogr. 9 poz., rys.

Twórcy

autor

Jakubik W.

• Institute of Physics, Silesian Technical University ul. Krzywoustego 2, 44-100 Gliwice, Poland