interested

Hi Tarik,

Metal oxides are selected for gas sensors can be determined from their electronic structure.Transition-metal oxides with d0 and d10 electronic configurations could be used in gas sensing applications .The d0 configuration could be found in transition metal WO3 and d10 appears in post-transition-metal oxides SnO2 .

Dear Tarik,

There are many advantages and restriction and operation condition related constraints on the utilization and design criteria for the chemical sensors.

WO3 can work at relatively higher temperatures.

SnO2 has higher sensero output, can work at lower temperatures.

Please find two attachments for you reading regarding the WO3 based and SnO based sensors, respectively.

I hope that helps

Thnaks

Regards

Hi Engin,

Thank you for ur response, but I think it isn't related to the operating temperature; taking an example of commercial TGS (SnO2-based gas sensors) which operated at 350 °C (high temp...). So I think this factor is common for both.

After long searching I found this response ("The predominance of SnO2 is due to the fact that the material is sensitive to all gaseous species") in the open-access paper below. (see fig 1)

Article One-Dimensional Oxide Nanostructures as Gas-Sensing Material...

Do you think that's the unique reason ?

Hello Tarik,

The question you asked could be answered in pages long text, even some parts are not even clear. I tried to make a very very brief comparison,

SnO2 has stability problem after all, in turn actuall WO3 as well, both are n type. WO3 are better for higher temperatures, relatively if course. WO3 is better for sulfur containing species.

The literature regarding the SnO2 is the far more largest than that of any other metal oxide based gas sensor.