Over the years, i have realized sulphides of ternary thin films are not good materials for gas sensing but oxides definitely are good sensing materials. What could be the cause of not using sulphides of materials as gas sensors?
Dear Efe,
Hope you a re well and every thing is okay with you.
I think sulphides may be hygroscopic materials such that they have great affinity for moisture. Then if they are subjected to moisture they will get poisoned by the water vapor.
On the other side oxides may be less absorbing the water vapor. Also the effect of temperature on the film material.
In summary it depends on stability of the material against the effects of the environment.
Best wishes.
Dear Efe,
Hope you a re well and every thing is okay with you.
I think sulphides may be hygroscopic materials such that they have great affinity for moisture. Then if they are subjected to moisture they will get poisoned by the water vapor.
On the other side oxides may be less absorbing the water vapor. Also the effect of temperature on the film material.
In summary it depends on stability of the material against the effects of the environment.
Best wishes.
Dear Abdelhalim Zekry,
I am doing pretty fine sir. I quite appreciate your comment. Well, what I observe when I pyrolyse CuZnS thin films was a dried coating on my substrate. More so, from the SEM analysis, absence of pore has been the results so far. In contracts to that, pyrolysing mixed metal oxide shows presence of holes for the occupation of charge particles withing the grains as seen in the SEM result. I just need to know if their is need to dope my sample before deposition so as to create vacant site for charged particles from the gas. I am used to sensing sensing ternary oxides and I have been having brilliant results. Thanks for the understanding professor.
Best regards,
Efe Frank.
I guess a bit of oxygen presence might be useful for better sensing.
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