Thermally Stable, Silica-Doped ε-WO3 for Sensing of Acetone in the Human Breath

Autor:	Sotiris E. Pratsinis, Marco Righettoni, Antonio Tricoli
Rok vydání:	2010
Předmět:	Materials science General Chemical Engineering Doping Analytical chemistry Nanoparticle General Chemistry Grain size Crystal chemistry.chemical_compound chemistry Phase (matter) Materials Chemistry Acetone Thermal stability Selectivity
Zdroj:	Chemistry of Materials. 22:3152-3157
ISSN:	1520-5002 0897-4756
DOI:	10.1021/cm1001576
Popis:	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 e-WO3, a metastable phase that has a high selectivity to acetone. The effect of nontoxic Si doping on the e-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.
Databáze:	OpenAIRE
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