A hydrogen sensor based on thick film process is reported. Firstly

Platinum heater lines are made by screen printing process

then it is coated with nano-catalyst/alumina to form gas sensitive element and coated with nano-alumina to form compensation element

respectively. Finally

hydrogen sensor are made. The test results show that the sensitivity of the sensor is greater than 21 m V/1% H

2

the response time is less than 30 s

both the nonlinearity and repeatability are prior to 2 %.