SnO₂/ZnO double layer thin films: a novel economical preparation and investigation of sensitivity and stability of double layer gas sensors
by M.R. Vaezi, A. Shokuhfar, S.K. Sadrnezhaad, T. Shokuhfar
International Journal of Nanomanufacturing (IJNM), Vol. 2, No. 1/2, 2008

Abstract: A double-layer SnO₂/ZnO gas sensor was produced by utilisation of SnO₂ and ZnO thin films. Top layer consisted of SnO₂ produced by a sol–gel-controlled annealing technique. Bottom coating consisted of ZnO thin film precipitated by Two-Stage Chemical Deposition (TSCD) from an aqueous zinc-containing solution. Both top and bottom coatings were analysed by SEM, XRD, EDAX and AAS. Gas sensitivity of the SnO₂/ZnO double layer was determined by electrical resistance measurements. Although sensitivity was slightly reduced by double-layer formation, selectivity and stability were considerably improved by combination of the two thin layers. The existence of an interfacial transition layer between SnO₂ and ZnO and stabilisation mechanism of the SnO₂/ZnO double layer were rigorously investigated in this research.

Online publication date: Sat, 19-Apr-2008

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