Considering the main source of electron scattering to be phonons, there is a geometrical effect affecting the mean-free path of electrons, discussed in some detail by Ziman in Chapter 11 of his book Electrons and Phonons: The Theory of Transport Phenomena in Solids (Oxford University Press, 1960) -- under the heading Size and Surface Effects, which you should consult.
Is the temperature constant? Perhaps the sample is sensitive to light as well? Mechanical stress may be at play as well. And the least welcome: chemical reactions with air, perhaps some kind of ageing?
yes temperature is constant but percentage of Titania is increasing in Silica and sheet resistance is changing but it is not only increasing. when R is plotted against concentration then it give two curves of increasing and decreasing what could be the reason?
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