Abstract
Tungsten-coated carbon microspheres were prepared by one-pot hydrothermal reaction of an aqueous solution containing glucose and sodium tungstate. The spheres were converted into WO3 hollow microspheres by the decomposition of their core carbon. The [glucose]/[sodium tungstate] ratio of the stock solution determined not only the morphology of the precursors but also the phase of the powders after calcination. The WO3 hollow microspheres showed a higher gas response and more selective detection of 0.5-2.5 ppm NO2 than WO3 solid and nano-porous microspheres did. The enhanced NO2 sensing characteristics are explained in relation to the surface area, pore volume, and hollow morphology.
Original language | English |
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Pages (from-to) | 236-242 |
Number of pages | 7 |
Journal | Sensors and Actuators, B: Chemical |
Volume | 142 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2009 Oct 12 |
Keywords
- Carbon template
- Hollow microspheres
- NO sensor
- WO
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Instrumentation
- Condensed Matter Physics
- Surfaces, Coatings and Films
- Metals and Alloys
- Electrical and Electronic Engineering
- Materials Chemistry