In order to study on effect of preparation technology of small hole diffusion barrier in limiting current oxygen sensor

8 % mol Y

2

O

3

stabilized ZrO

2

（ 8 YSZ） diaphragm is prepared by tape-casting method. Sensing electrodes and diffusion barriers are prepared by screen printing

finally

limiting current oxygen sensor with a small hole as diffusion barrier is obtained by co-firing. The micro structure of the oxygen sensor is characterized by means of scanning electron microscopy（ SEM）. It is found that the structure of diffusion barrier obtained by screen printing is acceptable and the new lamination method works well. It is verified by calculation that the

8 YSZ conductivity is proved that it possess enough conductivity to be used as pumping electrode by EIS and theoretical calculation. Furthermore

the gas sensing characteristics of the sensor are also tested. It is found that the sensor performance a saturation platform and the performance is influenced by working temperature. At the same time

the sensor exhibits ideal linear relationship between limiting current and oxygen concentration.