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Tailoring the Structural and Microstructural Properties of Nanosized Tantalum Oxide for High Temperature Electrochemical Gas Sensors

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Ta2O5 nanopowders to be used as sensing electrodes in high temperature electrochemical gas sensors for hydrocarbons detection were synthesized using a sol–gel method and their structural and microstructural properties were investigated. The as-synthesized powders were heated at different temperatures in the range 250–1000 °Cand characterized by TG-DTA, XRD, SEM, TEM and FT-IR. This investigation allowed to identify the correct thermal treatments to achieve the microstructural, textural and functional stability of materials working at high temperature, preserving their nanometric grain size. Planar sensors fabricated by using Ta2O5 powders treated at 750 °C showed promising results for the selective detection of propylene at high temperature (700 °C). The good stability of the sensing response after gas exposure at high temperature was correlated to the stable microstructure the electrodes. Thus, Ta2O5 powders seems good candidate as sensing electrode for sensors for automotive exhausts monitoring.
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Document Type: Research Article

Publication date: 2009-07-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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