Loading...

SnO2/ZnO double layer thin films: A novel economical preparation and investigation of sensitivity and stability of double layer gas sensors

Vaezi, M. R ; Sharif University of Technology | 2008

324 Viewed
  1. Type of Document: Article
  2. DOI: 10.1504/IJNM.2008.017839
  3. Publisher: Inderscience Publishers , 2008
  4. Abstract:
  5. A double-layer SnO2/ZnO gas sensor was produced by utilisation of SnOSUB align=right2 and ZnO thin films. Top layer consisted of SnOSUB align=right2 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. © 2008, Inderscience Publishers
  6. Keywords:
  7. Annealing ; Electric resistance measurement ; Precipitation (chemical) ; Sol-gels ; Thin films ; Tin oxides ; Zinc oxide ; Double-layer thin film ; Two-stage chemical deposition ; Chemical sensors
  8. Source: International Journal of Nanomanufacturing ; Volume 2, Issue 1-2 , 2008 , Pages 59-69 ; 17469392 (ISSN)
  9. URL: http://www.inderscience.com/offer.php?id=17839