Thermally Stable, Silica-Doped ε-WO3 for Sensing of Acetone in the Human Breath
Date
2010
Authors
Righettoni, M
Tricoli, Antonio
Pratsinis, S.E
Journal Title
Journal ISSN
Volume Title
Publisher
American Chemical Society
Abstract
Acetone in the human breath is a key marker for noninvasive diagnosis of diabetes. Here, sensing films of pure and SiO2-doped WO3 nanoparticles have been made, directly deposited and in situ annealed onto interdigitated electrodes by scalable flame aerosol technology. A unique innovation here is that these films consist of ε-WO3, a metastable phase that has a high selectivity to acetone. The effect of nontoxic Si doping on the ε-phase content and crystal and grain sizes was investigated and correlated to the acetone sensing performance of these films. The thermal stability of these materials was characterized as well, revealing a unique opportunity for reliable sensing of acetone and noninvasive diagnostics of diabetes. An optimal doping level with 10 mol % SiO2 resulted in highly sensitive and highly selective acetone sensors down to 20 ppb.
Description
Keywords
Keywords: Acetone sensor; Grain size; High selectivity; Highly sensitive; Human breath; In-situ; Inter-digitated electrodes; Metastable phase; Non-invasive diagnosis; Non-invasive diagnostics; Optimal doping; Phase content; Sensing films; Sensing performance; Si-do
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Source
Chemistry of Materials
Type
Journal article
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2037-12-31