NO2 sensing properties of WO3 nanorods grown on mica

✍ Scribed by El Achhab, Mhamed ;Shanak, Hussein ;Schierbaum, Klaus

• Book ID: 105366043
• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 562 KB
• Volume: 208
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.201000960

✦ Synopsis

Abstract

One‐dimensional nanostructures of tungsten trioxide were prepared by a simple chemical vapour deposition technique. WO~3~ is sublimated onto cleaved (0001) oriented mica substrates in air at atmospheric pressure. We obtained needle‐type crystals (‘nanorods’), epitaxially oriented in three directions along the principal symmetry axes of mica. Their morphology was investigated with atomic force microscopy (AFM). The WO~3~ structures were electrically contacted by means of four gold electrodes which were fabricated by optical lithography. In our experiments, we have analysed the NO~2~ sensing properties in a gas‐flow system with respect to stability, operation regimes, response and decay times, as well as cross‐sensitivity towards humidity.