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FESEM images of double-layer doped porous film, with 1% M doping amount, on glass substrates and their corresponding XPS patterns. [(a) and (b)] porous film with 1% M . [(c) and (d)] porous film with 1% M .
The photo of double-layer undoped porous film-based gas sensor on a ceramic tube, Inset: FESEM image of the area marked on the ceramic tube.
Response curves to 1000 ppm test gases at for and doped porous films with different doping amounts, (a) and (c) to ethanol gas. (b) and (d) to gas.
The relationship of sensitivity vs ion-doping amounts for and doped porous films to 1000 ppm ethanol and gases at , respectively. (a) porous film with . (b) porous film with .
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