What is reason for n & p-type behavior in gas sensing for one materials?

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William Senior

Links.

www.mdpi.com/1424-8220/12/7/9635/pdf

www.mdpi.com:8080/1424-8220/10/6/5469/pdf

https://books.google.co.ve/books?isbn=1600215149

https://books.google.co.ve/books?id=pl1EAgAAQBAJ&pg=PA279&lpg=PA279&dq=What+is+reason+for+n+%26+p-type+behavior+in+gas+sensing+for+one+materials?&source=bl&ots=HoxPa8rk5n&sig=EOX2GLH4JkxSHSHtBil9KVQ_Bi8&hl=es&sa=X&ved=0ahUKEwjzh8m5juzPAhUD4CYKHfCKBwsQ6AEITzAG#v=onepage&q=What%20is%20reason%20for%20n%20%26%20p-type%20behavior%20in%20gas%20sensing%20for%20one%20materials%3F&f=false

A------------ S-----------

hi Dr William Senior

thanks for your answer

Thanks Dr Yao.

but i observed full p-type behaviour for my layer in ethanol gas in 280C and there i see full n-type behaviour for this layer and gas in 250C and 300C.

i mean, how i can explain that?